Deck 35: Animal Reproduction and Development

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سؤال
Male Australian redback spiders present themselves to be eaten by their mates.
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سؤال
As human labor progresses,the woman's body releases more and more hormones that act to increase it.
سؤال
The process that unites the male gametes with the female gametes in organisms that reproduce sexually is termed

A) conjugation.
B) fertilization.
C) crossing-over.
D) gastrulation.
E) recombination.
سؤال
In working with an infertile couple,you observe that the wife releases polar bodies each month,wrapped in follicle cells.How would you explain their infertility?

A) The wife's ovaries are not making eggs, just polar bodies.
B) The wife lacks ovaries.
C) The wife has excess estrogen.
D) The wife's ovaries are producing testosterone.
E) None of the answer choices are correct.
سؤال
The polar body formed after meiosis I becomes the egg cell.
سؤال
If you observed two female redback spiders,one having 10 offspring and the other 50,what could explain the difference?

A) The female with more offspring ate her mate and was therefore better nourished.
B) The female with fewer offspring has a virus.
C) The female with more offspring has more estrogen.
D) The female with fewer offspring received more sperm from fewer males.
E) The female with more offspring is a better hunter.
سؤال
Chlamydia is a sexually transmitted disease which is a major cause of female infertility.
سؤال
If you were observing a newly discovered animal and wanted to determine if it reproduces sexually or asexually,you could best

A) examine parents and offspring to see if the offspring are genetically identical to parents.
B) examine males to see if sperm can be produced.
C) try to observe mating behavior.
D) look carefully for nests with eggs.
E) None of the answer choices are correct.
سؤال
Consumption of male redback spiders by females keeps numbers of males in check and is an example of homeostasis.
سؤال
What results when the sex cells of a male animal and a female animal unite,the resulting cell is called a

A) gamete.
B) morula.
C) polar body.
D) zygote.
E) oogonium.
سؤال
Human childbirth is known as labor.
سؤال
While observing a newly discovered kind of mouse,you see that its young strongly resemble caterpillars,but the adults look like normal mice.What term can you give for the development of this mouse?

A) direct
B) indirect
C) imcomplete
D) delayed
E) circumstantial
سؤال
Male redback spiders benefit when they are eaten by their mates because

A) they ultimately have higher reproductive success.
B) they are only partially eaten and can regrow lost parts.
C) they would die soon after copulation anyway.
D) they don't have to fight other males.
E) None of the answer choices are correct.
سؤال
In organisms that reproduce sexually,________ are the sex cells that carry the genetic information from each parent.

A) diploid gametes
B) diploid morulas
C) diploid zygotes
D) haploid gametes
E) haploid zygotes
سؤال
The contraceptive pill prevents both conception of a new life and implantation of the new human embryo in the uterine wall.
سؤال
Human development is an example of direct development.
سؤال
Male Australian redback spiders are much larger than the females.
سؤال
If a woman in labor has her cervix dilate,but her contractions remain too weak,what should be given to help her labor progress?

A) oxytocin
B) progesterone
C) estrogen
D) calcium
E) testosterone
سؤال
The first diploid cell giving rise,ultimately,to human eggs,is the primary oocyte.
سؤال
Hepatitis B is a sexually transmitted disease.
سؤال
In females,nearly all cases of _____ cancer are associated with the human papillomavirus.

A) ovarian.
B) lung.
C) breast.
D) cervical.
E) All answer choices are correct.
سؤال
Mature human sperm cells

A) are spermatozoa.
B) are secondary spermatocytes.
C) contain 46 chromosomes.
D) are primary spermatocytes.
E) undergo meiosis.
سؤال
In the male,the saclike structure that contains the testes is the

A) epididymis.
B) vas deferens.
C) scrotum.
D) sustentacular cells.
E) seminal vesicle.
سؤال
Testosterone is a male sex hormone.
سؤال
Fertilization of a secondary oocyte normally occurs in the

A) ovary.
B) vagina.
C) uterine tube.
D) uterus.
E) peritoneal cavity.
سؤال
In the human male and female reproductive systems,each system contains paired primary sex organs called _____,which contain _____ cells that give rise to gametes.

A) testes; sperm
B) gonads; germ
C) ovaries; egg
D) bulbourethral glands; germ
E) All of the answer choices are correct.
سؤال
Cilia sweep the released mature oocytes from ovaries into the

A) cervix.
B) uterine tubes.
C) pubic symphysis.
D) uterus.
E) vagina.
سؤال
If you were grading an exam on which a student had drawn and labelled a sperm cell,which label would lead to a loss of points?

A) flagellum
B) cilia
C) nucleus
D) acrosome
E) mitochondrion
سؤال
The tubelike structure that serves as the birth canal in the human female is the

A) cervix.
B) vulva.
C) vagina.
D) uterus.
E) uterine tube.
سؤال
In a secondary oocyte,meiosis is arrested in metaphase II until

A) ovulation.
B) FSH is present.
C) fertilization occurs.
D) LH is secreted by the anterior pituitary.
E) puberty.
سؤال
If asked to point to the place on a diagram where sperm cells are stored,you would place a pointer on the

A) scrotum.
B) vas deferens.
C) epididymis.
D) bulbourethral gland.
E) seminal vesicle.
سؤال
If you were diagnosing a case of infertility in a male patient,and you found that his sperm failed to swim,you would diagnose a problem in the

A) bulbourethral gland.
B) seminal vesicle.
C) prostate gland.
D) vas deferens.
E) epididymis.
سؤال
No matter what else occurred,pregnancy would be impossible if a woman lost her

A) ovary.
B) pubic symphysis.
C) vagina.
D) uterus.
E) vulva.
سؤال
Menopause

A) is the cessation of menstruation.
B) is the cessation of sperm production.
C) is the beginning of menstruation.
D) begins in most females at puberty.
E) begins in most males at puberty.
سؤال
Human spermatogonia

A) are diploid.
B) are diploid cells that reside within the seminiferous tubules.
C) are germ cells.
D) are germ cells that reside within the seminiferous tubules.
E) reside within the seminiferous tubules.
سؤال
The tightly coiled structure inside each testis that produces sperm cells is the

A) seminiferous tubule.
B) epididymis.
C) vas deferens.
D) interstitial cell.
E) bulbourethral gland.
سؤال
Trihydroxytestosterone is a male sex hormone.
سؤال
In human males,the different types of male sex hormones are collectively called

A) estrogens.
B) growth hormones.
C) progesterones.
D) androgens.
E) follicle-stimulating hormones.
سؤال
The caplike _____ covers the head of the sperm and releases enzymes that will help the sperm penetrate the egg.

A) epididymis
B) vas deferens
C) acrosome
D) mitochondrion
E) nucleus
سؤال
The cells in the ovary that give rise to the mature egg cells are the

A) follicle cells.
B) osteocytes.
C) endometrial cells.
D) polar bodies.
E) primary oocytes.
سؤال
Substances that cause birth defects are collectively called

A) androgens.
B) prostaglandins.
C) teratogens.
D) follicle-stimulating hormones.
E) None of the answer choices are correct.
سؤال
The hormone released by the anterior pituitary that stimulates the development of the corpus luteum is

A) GnRH.
B) FSH.
C) LH.
D) ADH.
E) progesterone.
سؤال
The hormone that is the basis of most pregnancy tests is

A) follicle-stimulating hormone.
B) luteinizing hormone.
C) human chorionic gonadotropin.
D) estrogen.
E) progesterone.
سؤال
Athletes who take synthetic steroids can become sterile due to lack of sperm production.This is because of negative feedback on which of the following?

A) the epididymis
B) the testes
C) the vas deferens
D) the prostate
E) the hypothalamus
سؤال
A caterpillar turning into a butterfly is an example of

A) direct development.
B) indirect development.
C) external fertilization.
D) internal fertilization.
E) reproduction.
سؤال
Birth control pills generally contain only estrogen.
سؤال
In the late 1950s,some women were prescribed a teratogen to relieve symptoms of morning sickness.This drug caused abnormal limb development in the children of these women.What was this drug?

A) acetaminophen
B) acutane
C) erythromycin
D) thalidomide
E) penicillin
سؤال
The stage of human development that occurs from implantation to about 8 weeks after fertilization is the

A) zygote.
B) morula.
C) gastrula.
D) fetal stage.
E) embryonic stage.
سؤال
A vasectomy is a surgical procedure in which the vas deferens are severed,and then tied.How would this cause sterility?

A) Sperm cannot be produced by meiosis.
B) Sperm cannot be produced by mitosis.
C) Sperm cannot move to the urethra.
D) A man cannot get an erection.
E) The testes stop producing testosterone.
سؤال
In humans,if a preembryo splits during the first 2 weeks of development,_____ are usually formed.

A) polar bodies
B) secondary oocytes
C) fraternal twins
D) identical twins
E) embryonic discs
سؤال
If you were observing an early stage in human development at which endoderm,mesoderm,and ectoderm had just formed,you would be looking at a

A) zygote.
B) gastrula.
C) embryonic stage.
D) morula.
E) fetal stage.
سؤال
The correct sequence for the stages in development from conception to birth is

A) preembryonic stage, zygote, embryonic stage, fetal stage.
B) fetal stage, zygote, preembryonic stage, embryonic stage.
C) preembryonic stage, embryonic stage, zygote, fetal stage.
D) zygote, preembryonic stage, embryonic stage, fetal stage.
E) fetal stage, embryonic stage, preembryonic stage, zygote.
سؤال
The hormone released from the hypothalamus that stimulates release of LH and FSH in both the male and female is

A) human growth hormone.
B) testosterone.
C) gonadotropin-releasing hormone.
D) antidiuretic hormone.
E) epinephrine.
سؤال
A female chicken laying a fertilized egg has undergone ____ with a rooster.

A) differentiation
B) external fertilization
C) indirect development
D) direct development
E) internal fertilization
سؤال
If you were measuring hormones in the blood of a patient who was ovulating,you would expect a large increase in which hormone,reaching maximal level on the day of ovulation?

A) FSH
B) LH
C) estrogen
D) progesterone
E) GnRH
سؤال
A diaphragm is a shallow,dome-shaped rubber disk with a flexible rim that fits within the vagina and covers the cervix.How does this act as a contraceptive to prevent pregnancy?

A) It would prevent sperm from reaching the egg.
B) It would prevent ovulation.
C) It would cause the embryo to die.
D) It would prevent implantation on the uterine wall.
E) If would act as a spermicide, killing sperm.
سؤال
A baby turtle growing into an adult that appears similar is an example of

A) direct development.
B) indirect development.
C) differentiation.
D) external fertilization.
E) internal fertilization.
سؤال
After cleavage,the solid ball of 16 or more cells resembling a mulberry that forms is the

A) blastocyst.
B) gastrula.
C) morula.
D) embryonic disc.
E) amnion.
سؤال
In humans,the transparent sac that contains fluid that cushions the embryo and maintains a constant temperature and pressure is the

A) amnion.
B) yolk sac.
C) embryonic disc.
D) chorionic villus.
E) chorion.
سؤال
A female salmon laying unfertilized eggs in a nest is preparing them for ____ by a male salmon.

A) external fertilization
B) internal fertilization
C) indirect development
D) direct development
E) differentiation
سؤال
A tubal ligation is a surgical procedure in which the uterine tubes are severed,and then tied.How would this cause sterility?

A) Oocytes cannot be produced by meiosis.
B) Oocytes cannot move to the uterus.
C) Oocytes cannot be produced by mitosis.
D) A woman cannot have an orgasm.
E) The ovary stops producing estrogen.
سؤال
Sea urchins display external fertilization.
سؤال
Thalidomide was given to pregnant women from 1957-1961 to help relieve the symptoms of morning sickness.Thalidomide binds to and inactivates the protein cereblon,which is important in limb formation.If a woman took thalidomide during the _____ period of her baby's development,it could result in stunted growth of its limbs.

A) preembryonic
B) fetal
C) prezygotic
D) embryonic
E) delivery
سؤال
If you were presented with a patient whose STD responded to drugs specifically directed against protists,you would diagnose

A) trichomoniasis.
B) HIV.
C) HPV.
D) Chlamydia.
E) a yeast infection.
سؤال
Suppose you are working with a group of poor families with insufficent diets,and asked to predict possible health problems,one of the first you might expect would be many birth defects due to insufficient vitamin intake.
سؤال
If you were observing the early development of a chick embryo and saw patterns in terms of the placement of head and wings,you would assume that you were seeing the effects of

A) controlled gene expression.
B) temperature.
C) appropriate lighting.
D) sex hormones.
E) All of the answer choices are correct.
سؤال
In observing an unusual new fish,you see the male come very close to the female and insert a specialized fin into a place where eggs emerge in other fish,leading you to guess that these fish have evolved internal fertilization.
سؤال
Human sperm swim to the egg.
سؤال
The second stage of prenatal development is the fetal stage.
سؤال
In fruit fly development expression of the bicoid gene on one end of the embryo is necessary for proper head positioning.
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ملء الشاشة (f)
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Deck 35: Animal Reproduction and Development
1
Male Australian redback spiders present themselves to be eaten by their mates.
True
2
As human labor progresses,the woman's body releases more and more hormones that act to increase it.
False
3
The process that unites the male gametes with the female gametes in organisms that reproduce sexually is termed

A) conjugation.
B) fertilization.
C) crossing-over.
D) gastrulation.
E) recombination.
B
4
In working with an infertile couple,you observe that the wife releases polar bodies each month,wrapped in follicle cells.How would you explain their infertility?

A) The wife's ovaries are not making eggs, just polar bodies.
B) The wife lacks ovaries.
C) The wife has excess estrogen.
D) The wife's ovaries are producing testosterone.
E) None of the answer choices are correct.
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5
The polar body formed after meiosis I becomes the egg cell.
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6
If you observed two female redback spiders,one having 10 offspring and the other 50,what could explain the difference?

A) The female with more offspring ate her mate and was therefore better nourished.
B) The female with fewer offspring has a virus.
C) The female with more offspring has more estrogen.
D) The female with fewer offspring received more sperm from fewer males.
E) The female with more offspring is a better hunter.
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7
Chlamydia is a sexually transmitted disease which is a major cause of female infertility.
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8
If you were observing a newly discovered animal and wanted to determine if it reproduces sexually or asexually,you could best

A) examine parents and offspring to see if the offspring are genetically identical to parents.
B) examine males to see if sperm can be produced.
C) try to observe mating behavior.
D) look carefully for nests with eggs.
E) None of the answer choices are correct.
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9
Consumption of male redback spiders by females keeps numbers of males in check and is an example of homeostasis.
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10
What results when the sex cells of a male animal and a female animal unite,the resulting cell is called a

A) gamete.
B) morula.
C) polar body.
D) zygote.
E) oogonium.
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11
Human childbirth is known as labor.
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12
While observing a newly discovered kind of mouse,you see that its young strongly resemble caterpillars,but the adults look like normal mice.What term can you give for the development of this mouse?

A) direct
B) indirect
C) imcomplete
D) delayed
E) circumstantial
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13
Male redback spiders benefit when they are eaten by their mates because

A) they ultimately have higher reproductive success.
B) they are only partially eaten and can regrow lost parts.
C) they would die soon after copulation anyway.
D) they don't have to fight other males.
E) None of the answer choices are correct.
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14
In organisms that reproduce sexually,________ are the sex cells that carry the genetic information from each parent.

A) diploid gametes
B) diploid morulas
C) diploid zygotes
D) haploid gametes
E) haploid zygotes
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15
The contraceptive pill prevents both conception of a new life and implantation of the new human embryo in the uterine wall.
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16
Human development is an example of direct development.
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17
Male Australian redback spiders are much larger than the females.
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18
If a woman in labor has her cervix dilate,but her contractions remain too weak,what should be given to help her labor progress?

A) oxytocin
B) progesterone
C) estrogen
D) calcium
E) testosterone
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19
The first diploid cell giving rise,ultimately,to human eggs,is the primary oocyte.
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20
Hepatitis B is a sexually transmitted disease.
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21
In females,nearly all cases of _____ cancer are associated with the human papillomavirus.

A) ovarian.
B) lung.
C) breast.
D) cervical.
E) All answer choices are correct.
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22
Mature human sperm cells

A) are spermatozoa.
B) are secondary spermatocytes.
C) contain 46 chromosomes.
D) are primary spermatocytes.
E) undergo meiosis.
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23
In the male,the saclike structure that contains the testes is the

A) epididymis.
B) vas deferens.
C) scrotum.
D) sustentacular cells.
E) seminal vesicle.
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24
Testosterone is a male sex hormone.
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25
Fertilization of a secondary oocyte normally occurs in the

A) ovary.
B) vagina.
C) uterine tube.
D) uterus.
E) peritoneal cavity.
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26
In the human male and female reproductive systems,each system contains paired primary sex organs called _____,which contain _____ cells that give rise to gametes.

A) testes; sperm
B) gonads; germ
C) ovaries; egg
D) bulbourethral glands; germ
E) All of the answer choices are correct.
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27
Cilia sweep the released mature oocytes from ovaries into the

A) cervix.
B) uterine tubes.
C) pubic symphysis.
D) uterus.
E) vagina.
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28
If you were grading an exam on which a student had drawn and labelled a sperm cell,which label would lead to a loss of points?

A) flagellum
B) cilia
C) nucleus
D) acrosome
E) mitochondrion
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29
The tubelike structure that serves as the birth canal in the human female is the

A) cervix.
B) vulva.
C) vagina.
D) uterus.
E) uterine tube.
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30
In a secondary oocyte,meiosis is arrested in metaphase II until

A) ovulation.
B) FSH is present.
C) fertilization occurs.
D) LH is secreted by the anterior pituitary.
E) puberty.
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31
If asked to point to the place on a diagram where sperm cells are stored,you would place a pointer on the

A) scrotum.
B) vas deferens.
C) epididymis.
D) bulbourethral gland.
E) seminal vesicle.
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32
If you were diagnosing a case of infertility in a male patient,and you found that his sperm failed to swim,you would diagnose a problem in the

A) bulbourethral gland.
B) seminal vesicle.
C) prostate gland.
D) vas deferens.
E) epididymis.
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33
No matter what else occurred,pregnancy would be impossible if a woman lost her

A) ovary.
B) pubic symphysis.
C) vagina.
D) uterus.
E) vulva.
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34
Menopause

A) is the cessation of menstruation.
B) is the cessation of sperm production.
C) is the beginning of menstruation.
D) begins in most females at puberty.
E) begins in most males at puberty.
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35
Human spermatogonia

A) are diploid.
B) are diploid cells that reside within the seminiferous tubules.
C) are germ cells.
D) are germ cells that reside within the seminiferous tubules.
E) reside within the seminiferous tubules.
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36
The tightly coiled structure inside each testis that produces sperm cells is the

A) seminiferous tubule.
B) epididymis.
C) vas deferens.
D) interstitial cell.
E) bulbourethral gland.
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37
Trihydroxytestosterone is a male sex hormone.
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38
In human males,the different types of male sex hormones are collectively called

A) estrogens.
B) growth hormones.
C) progesterones.
D) androgens.
E) follicle-stimulating hormones.
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39
The caplike _____ covers the head of the sperm and releases enzymes that will help the sperm penetrate the egg.

A) epididymis
B) vas deferens
C) acrosome
D) mitochondrion
E) nucleus
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40
The cells in the ovary that give rise to the mature egg cells are the

A) follicle cells.
B) osteocytes.
C) endometrial cells.
D) polar bodies.
E) primary oocytes.
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41
Substances that cause birth defects are collectively called

A) androgens.
B) prostaglandins.
C) teratogens.
D) follicle-stimulating hormones.
E) None of the answer choices are correct.
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42
The hormone released by the anterior pituitary that stimulates the development of the corpus luteum is

A) GnRH.
B) FSH.
C) LH.
D) ADH.
E) progesterone.
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43
The hormone that is the basis of most pregnancy tests is

A) follicle-stimulating hormone.
B) luteinizing hormone.
C) human chorionic gonadotropin.
D) estrogen.
E) progesterone.
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44
Athletes who take synthetic steroids can become sterile due to lack of sperm production.This is because of negative feedback on which of the following?

A) the epididymis
B) the testes
C) the vas deferens
D) the prostate
E) the hypothalamus
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45
A caterpillar turning into a butterfly is an example of

A) direct development.
B) indirect development.
C) external fertilization.
D) internal fertilization.
E) reproduction.
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46
Birth control pills generally contain only estrogen.
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47
In the late 1950s,some women were prescribed a teratogen to relieve symptoms of morning sickness.This drug caused abnormal limb development in the children of these women.What was this drug?

A) acetaminophen
B) acutane
C) erythromycin
D) thalidomide
E) penicillin
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48
The stage of human development that occurs from implantation to about 8 weeks after fertilization is the

A) zygote.
B) morula.
C) gastrula.
D) fetal stage.
E) embryonic stage.
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49
A vasectomy is a surgical procedure in which the vas deferens are severed,and then tied.How would this cause sterility?

A) Sperm cannot be produced by meiosis.
B) Sperm cannot be produced by mitosis.
C) Sperm cannot move to the urethra.
D) A man cannot get an erection.
E) The testes stop producing testosterone.
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50
In humans,if a preembryo splits during the first 2 weeks of development,_____ are usually formed.

A) polar bodies
B) secondary oocytes
C) fraternal twins
D) identical twins
E) embryonic discs
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51
If you were observing an early stage in human development at which endoderm,mesoderm,and ectoderm had just formed,you would be looking at a

A) zygote.
B) gastrula.
C) embryonic stage.
D) morula.
E) fetal stage.
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52
The correct sequence for the stages in development from conception to birth is

A) preembryonic stage, zygote, embryonic stage, fetal stage.
B) fetal stage, zygote, preembryonic stage, embryonic stage.
C) preembryonic stage, embryonic stage, zygote, fetal stage.
D) zygote, preembryonic stage, embryonic stage, fetal stage.
E) fetal stage, embryonic stage, preembryonic stage, zygote.
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53
The hormone released from the hypothalamus that stimulates release of LH and FSH in both the male and female is

A) human growth hormone.
B) testosterone.
C) gonadotropin-releasing hormone.
D) antidiuretic hormone.
E) epinephrine.
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54
A female chicken laying a fertilized egg has undergone ____ with a rooster.

A) differentiation
B) external fertilization
C) indirect development
D) direct development
E) internal fertilization
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55
If you were measuring hormones in the blood of a patient who was ovulating,you would expect a large increase in which hormone,reaching maximal level on the day of ovulation?

A) FSH
B) LH
C) estrogen
D) progesterone
E) GnRH
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56
A diaphragm is a shallow,dome-shaped rubber disk with a flexible rim that fits within the vagina and covers the cervix.How does this act as a contraceptive to prevent pregnancy?

A) It would prevent sperm from reaching the egg.
B) It would prevent ovulation.
C) It would cause the embryo to die.
D) It would prevent implantation on the uterine wall.
E) If would act as a spermicide, killing sperm.
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57
A baby turtle growing into an adult that appears similar is an example of

A) direct development.
B) indirect development.
C) differentiation.
D) external fertilization.
E) internal fertilization.
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58
After cleavage,the solid ball of 16 or more cells resembling a mulberry that forms is the

A) blastocyst.
B) gastrula.
C) morula.
D) embryonic disc.
E) amnion.
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59
In humans,the transparent sac that contains fluid that cushions the embryo and maintains a constant temperature and pressure is the

A) amnion.
B) yolk sac.
C) embryonic disc.
D) chorionic villus.
E) chorion.
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60
A female salmon laying unfertilized eggs in a nest is preparing them for ____ by a male salmon.

A) external fertilization
B) internal fertilization
C) indirect development
D) direct development
E) differentiation
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61
A tubal ligation is a surgical procedure in which the uterine tubes are severed,and then tied.How would this cause sterility?

A) Oocytes cannot be produced by meiosis.
B) Oocytes cannot move to the uterus.
C) Oocytes cannot be produced by mitosis.
D) A woman cannot have an orgasm.
E) The ovary stops producing estrogen.
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62
Sea urchins display external fertilization.
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63
Thalidomide was given to pregnant women from 1957-1961 to help relieve the symptoms of morning sickness.Thalidomide binds to and inactivates the protein cereblon,which is important in limb formation.If a woman took thalidomide during the _____ period of her baby's development,it could result in stunted growth of its limbs.

A) preembryonic
B) fetal
C) prezygotic
D) embryonic
E) delivery
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64
If you were presented with a patient whose STD responded to drugs specifically directed against protists,you would diagnose

A) trichomoniasis.
B) HIV.
C) HPV.
D) Chlamydia.
E) a yeast infection.
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65
Suppose you are working with a group of poor families with insufficent diets,and asked to predict possible health problems,one of the first you might expect would be many birth defects due to insufficient vitamin intake.
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66
If you were observing the early development of a chick embryo and saw patterns in terms of the placement of head and wings,you would assume that you were seeing the effects of

A) controlled gene expression.
B) temperature.
C) appropriate lighting.
D) sex hormones.
E) All of the answer choices are correct.
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67
In observing an unusual new fish,you see the male come very close to the female and insert a specialized fin into a place where eggs emerge in other fish,leading you to guess that these fish have evolved internal fertilization.
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68
Human sperm swim to the egg.
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69
The second stage of prenatal development is the fetal stage.
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70
In fruit fly development expression of the bicoid gene on one end of the embryo is necessary for proper head positioning.
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