Question 1

Some protists use multiple fission (cell division preceded by several nuclear divisions)as a means of reproduction.Multiple fission is also referred to as
A)budding.
B)zygotic meiosis.
C)schizogony.
D)syngamy.
E)intermediary meiosis.

Accepted Answer

Multiple fission is also known as schizogony, which is a type of asexual reproduction in some protists. During this process, multiple rounds of nuclear division precede cell division, resulting in the formation of multiple daughter cells at once. Budidng (A) is a different type of asexual reproduction in which a small outgrowth forms on the parent cell and eventually detaches to become a new individual. Zygotic meiosis (B) and syngamy (D) involve sexual reproduction, while intermediary meiosis (E) is not a known term in biology.

Question 2

Conjugating ciliates exchange a pair of haploid micronuclei that undergo mitosis as a diploid micronucleus,while the macronucleus in each
A)is expelled from the cell.
B)disintegrates.
C)divides by meiosis.
D)fuses with each other.
E)shrinks and becomes diploid micronuclei.

Accepted Answer

The macronucleus in conjugating ciliates disintegrates, and does not play a role in the exchange of genetic material.

Question 3

Protists are classified into a single kingdom because of which of the following features?
A)They are eukaryotes,but not fungi,plants,or animals.
B)They are microscopic.
C)They are unicellular.
D)All types of nutritional modes are founD.
E)They are monophyletic.

Accepted Answer

Protists are classified into a single kingdom because they are eukaryotes that do not fit into the other kingdoms of fungi, plants, or animals. They are a diverse group with varying characteristics, but this classification is primarily due to their exclusion from these other eukaryotic kingdoms.

Question 4

Centrioles are not found in
A)cellular slime molds.
B)diatoms.
C)Paramecia.
D)trypanosomes.
E)kelp.

Accepted Answer

The answer of Centrioles are not found in
A)cellular slime molds.
B)diatoms.
C)Paramecia.
D)trypanosomes.
E)kelp....

Question 5

Individual organisms move through the soil or other substrate to ingest bacteria,etc. ,till a certain phase of their life cycle,when they aggregate into a single moving mass,which ultimately becomes encysted into spores.These organisms are
A)green algae.
B)brown algae.
C)red algae.
D)cellular slime molds.
E)dinoflagellates.

Accepted Answer

The description provided matches the life cycle of cellular slime molds. The individual cells move through substrate, aggregate into a mass (called a slug), and then form a fruiting body encased in spores before dispersing. Green, brown, and red algae typically do not form spores or aggregate into a slug-like mass, and dinoflagellates are single-celled organisms that primarily live in aquatic environments.

Question 6

Which of the following is not one of the distinctive features of dinoflagellates?
A)They are unicellular.
B)They are photosynthetic.
C)Some exist in fresh water,while some are part of marine plankton.
D)They form large,spherical colonies.
E)Some planktonic members are luminous and cause flashes in the night.

Accepted Answer

Dinoflagellates do not typically form large, spherical colonies. Instead, some species may form chains or clusters, but they are still unicellular. The other options (A, B, C, and E) are all distinctive features of dinoflagellates.

Question 7

Amoebas lack
A)cell walls.
B)flagella.
C)nuclei.
D)meiosis.
E)any form of sexuality.

Accepted Answer

The answer of Amoebas lack
A)cell walls.
B)flagella.
C)nuclei.
D)meiosis.
E)any form of sexuality....

Question 8

Which of the following is not true about Euglena?
A)belongs to the same phylum as Paramecium
B)does not have flagella
C)has a pellicle
D)has numerous chloroplasts with chlorophyll a and b
E)does not have sexual reproduction

Accepted Answer

Euglena does have flagella, which are used for movement.

Question 9

The parasite that is responsible for causing malaria is called
A)Streptococcus.
B)Chlamydomonas.
C)Plasmodium.
D)Entamoeba.
E)Giardia.

Accepted Answer

Plasmodium is the genus of parasitic protozoans that causes malaria in humans. Streptococcus is a genus of bacteria, while Chlamydomonas, Entamoeba, and Giardia are all different types of protozoa that are not responsible for causing malaria.

Question 10

Trypanosomiasis is spread by
A)mosquitoes.
B)airborne droplets.
C)tsetse flies.
D)fleas on rats.
E)contaminated water.

Accepted Answer

Trypanosomiasis, also known as African sleeping sickness, is caused by the tsetse fly which is found in sub-Saharan Africa.

Question 11

The present day _________ have representatives most like the earliest eukaryotes.
A)Diplomonads
B)Euglenozoa
C)Alveolata
D)Rhodophyta
E)Stramenopila

Accepted Answer

Diplomonads, such as Giardia, are thought to be the earliest branching eukaryotic lineage. They lack mitochondria and have simple, anaerobic metabolism, similar to what the first eukaryotes would have had. Other groups, such as Euglenozoa and Stramenopila, have more complex organelles and metabolic processes that evolved later in eukaryotic evolution. Alveolata and Rhodophyta evolved later and have additional complex features such as plastids and complex life cycles.

Question 12

The limestone making up the famous landmark in England,the White Cliffs of Dover,are the pore-studded shells (tests)of
A)diatoms.
B)dinoflagellates.
C)brown algae.
D)spirochetes.
E)foraminifera.

Accepted Answer

The White Cliffs of Dover are primarily composed of foraminifera, which are single-celled organisms with shells made of calcium carbonate. These shells contain numerous small pores, giving the cliffs their characteristic appearance. Diatoms, dinoflagellates, brown algae, and spirochetes are not known to contribute significantly to the formation of limestone.

Question 13

Vacuoles for ingesting food and regulating their water balance are characteristic of
A)sporozoans.
B)trypanosomes.
C)ciliates.
D)algae.
E)spirochetes.

Accepted Answer

Ciliates are known for having contractile vacuoles that regulate their water balance and food vacuoles for ingesting food. Sporozoans, trypanosomes, algae, and spirochetes do not have vacuoles for ingesting food or regulating water balance as characteristic traits.

Question 14

The malarial parasite,Plasmodium,is a member of the group
A)EuglenozoA.
B)Stramenopiles.
C)Alveolata.
D)Rhodophyta.
E)Diplomonads.

Accepted Answer

Plasmodium belongs to the phylum Alveolata, which includes a diverse range of organisms such as ciliates and dinoflagellates.

Question 15

The organism,Phytophthora infestans,responsible for the Irish Potato Famine of 1845 and 1847 belongs to
A)EuglenozoA.
B)Alveolata.
C)Rhodophyta.
D)Chlorophyta.
E)Stramenopila.

Accepted Answer

Phytophthora infestans belongs to the Stramenopila group, which includes diatoms, brown algae, and some water molds.

Question 16

Oomycetes are characterized by all of the following except they
A)produce zoospores asexually.
B)are able to reproduce sexually.
C)contain motile spores.
D)contain two unequal flagella.
E)were once considered fungi.

Accepted Answer

Oomycetes were once considered fungi due to their filamentous growth habit and similar ecological roles. However, they are now recognized as a distinct group of organisms within the stramenopiles.

Question 17

Which of the following terms is NOT associated with the Euglenozoa?
A)stigma
B)pellicle
C)cilia
D)reservoir
E)flagellum

Accepted Answer

Euglenozoa, such as Euglena, typically have a flagellum, a pellicle, a stigma, and a reservoir, but they do not have cilia. Cilia are associated with other protists like ciliates.

Question 18

In addition to their characteristic cilia,most ciliates contain two types of
A)nuclei.
B)chloroplasts.
C)flagella.
D)wood-digesting enzymes.
E)cysts.

Accepted Answer

Most ciliates contain two types of nuclei: a micronucleus and macronucleus.

Question 19

The unique double shells of diatoms are made of
A)cellulose.
B)silica.
C)chlorophylls.
D)agar.
E)proteins.

Accepted Answer

The unique double shells of diatoms are made of silica, a mineral that is commonly found in rocks and sand. The shells are known as frustules and are intricately shaped and patterned, serving as a protective covering for the organism.

Question 20

Members of the Euglenozoa move within their habitats with the aid of
A)tests.
B)pseudopodia.
C)cilia.
D)flagella.
E)pellicles.

Accepted Answer

Members of the Euglenozoa move within their habitats with the aid of flagella.

Quiz 29: Protists

Some protists use multiple fission (cell division preceded by several nuclear divisions) as a means of reproduction.Multiple fission is also referred to as

Conjugating ciliates exchange a pair of haploid micronuclei that undergo mitosis as a diploid micronucleus,while the macronucleus in each

Protists are classified into a single kingdom because of which of the following features?

Centrioles are not found in

Individual organisms move through the soil or other substrate to ingest bacteria,etc. ,till a certain phase of their life cycle,when they aggregate into a single moving mass,which ultimately becomes encysted into spores.These organisms are

Which of the following is not one of the distinctive features of dinoflagellates?

Amoebas lack

Which of the following is not true about Euglena?

The parasite that is responsible for causing malaria is called

Trypanosomiasis is spread by

The present day _________ have representatives most like the earliest eukaryotes.

The limestone making up the famous landmark in England,the White Cliffs of Dover,are the pore-studded shells (tests) of

Vacuoles for ingesting food and regulating their water balance are characteristic of

The malarial parasite,Plasmodium,is a member of the group

The organism,Phytophthora infestans,responsible for the Irish Potato Famine of 1845 and 1847 belongs to

Oomycetes are characterized by all of the following except they

Which of the following terms is NOT associated with the Euglenozoa?

In addition to their characteristic cilia,most ciliates contain two types of

The unique double shells of diatoms are made of

Members of the Euglenozoa move within their habitats with the aid of