Deck 5: Unicellular Eukaryotes

Question 1

Some cases of congenital mental retardation are caused by

A)coccidians.
B)Plasmodium.
C)Anopheles.
D)Toxoplasma.

Answer 1

D

Question 2

The best fossils of protists have been left by the tests of the radiolarians (Actinopodans)and the foraminiferans (Granuloreticulosans).
Multiple Choice Questions

Answer 2

True

Question 3

Characteristics of unicellular eukaryotes include:

A)only sessile cells
B)unicellular,multicellular,but not colonial types
C)germ layers present
D)species with endoskeletons,exoskeletons,and species that are naked

Answer 3

D

Question 4

During conjugation

A)haploid micronuclei are exchanged.
B)macronuclei are formed.
C)binary fission occurs.
D)the micronuclei disappear.

Question 5

Most of the nitrogenous wastes in unicellular eukaryotes are eliminated by diffusion through the cell membrane.

Question 6

One of the best examples of intracellular specialization is colonial protozoa that have both somatic and reproductive zooids in the colony.

Question 7

A complex life cycle including merozoites and sporozoites is found in the parasitic apicomplexans.

Question 8

Red tides may be best described by

A)tidal fluctuations.
B)the red color in the water.
C)growth of certain dinoflagellates producing detectable levels of toxin.
D)all of the above

Question 9

The process of endosymbiosis may have resulted in eukaryotic cells by bacteria engulfing aerobic bacteria with enzymes that processed oxygen for energy transformations.

Question 10

Long,thin pseudopodia supported by axial rods of microtubules are

A)lobopodiA.
B)filopodia.
C)axopodia.
D)reticulopodia.

Question 11

The protozoan Trypanosoma causes human

A)malariA.
B)amebic dysentery.
C)African sleeping sickness.
D)birth defects.

Question 12

At the base of every flagellum or cilium is found a

A)kinetosome.
B)kinetid.
C)kinetodesmose.
D)kinetoplast.

Question 13

The microorganism _________________ may cause serious infections in AIDS patients.

A)Toxoplasma
B)Didinum
C)Thalassicolla
D)Stentor
Fill in the Blank Questions

Question 14

Gametic meiosis occurs just after zygote formation.

Question 15

Division of labor among cells is seen in some colonial protozoans.

Question 16

The division of labor and specialization of organelles are carried furthest by which of the following protozoan groups?

A)Phylum Chlorophyta
B)Phylum Ciliophora
C)Phylum Apicomplexa
D)Phylum Dinoflagellata

Question 17

When meiosis occurs during the first divisions after sexual fertilization,it is called

A)zygotic meiosis.
B)gametic meiosis.
C)intermediary meiosis.
D)mitotic meiosis.

Question 18

Reproduction in most unicellular eukaryotes is primarily by

A)conjugation.
B)asexual reproduction.
C)fusion of gametes.
D)parthenogenesis.

Question 19

Which of the following represents the arrangement of microtubules in an axoneme of a cilium?

A)nine peripheral triplets of microtubules
B)nine peripheral pairs of microtubules plus one central pair
C)nine peripheral triplets plus one central pair
D)nine peripheral pairs plus two central pairs

Question 20

Recent studies indicate that the traditional naming of unicellular eukaryotes as "Protista" is not a valid taxonomic group,but may comprise 10 or more phyla.

Question 21

The protozoan phylum that contains only endoparasitic forms is the _____________.

Question 22

Photosynthetic bodies (e.g. ,Phylum Chlorophyta)that contain chlorophyll and sometimes other pigments are called _________________.

Question 23

Osmoregulation in unicellular eukaryotes is carried out chiefly by structures called ______________________.

Question 24

A sporozoean parasite of cats that can cause birth defects in humans is called ___________.

Question 25

Euglena has a red "eyespot",or ______________,that functions in orientation to light.

Question 26

______________ are dormant forms of unicellular eukaryotes that have resistant external coverings.

Question 27

The genus of the organism causing malaria is _______________.

Question 28

Sexual reproduction involves production of gametes that fuse to form a _______________.

Question 29

Multiple fission or schizogony is a type of asexual reproduction characteristic of all protozoa belonging to the taxon called ______________.

Question 30

After phagocytosis,the food particle is held in a food vacuole or ____________________.

Question 31

The small bodies in ciliate protozoa that are discharged to aid in the capture of prey or to serve as a defensive mechanism are called _______________.

Question 32

At the base of each cilium is found a kinetosome,which has exactly the same structure as a ___________________,a structure important in cell division.

Question 33

Multiple fission associated with spore formation is called _____________.

Question 34

Amebic dysentery is most often caused by the protozoan species _________________.

Question 35

Ciliates are always multinucleate,possessing at least one _______________ and one _______________.

Question 36

Malaria is transmitted by __________,which inject (name the stage)_____________ when they bite.

Question 37

The "9 + 2" tube of microtubules in a flagellum or cilium is called an _____________________.

Question 38

Some species in the genus ___________ of Kinetoplastans cause serious disease in humans and domestic animals.

Question 39

When gametic nuclei arise by meiosis and form a zygote within the same organism that produced them,the process is called ________________.

Question 40

Foraminiferans are protozoans that form complex,many-chambered tests composed of _________.

Question 41

The movement of cilia and flagella is based on the energy in the molecule _________________.

Question 42

_________________ have specialized structures such as rhoptries and micronemes for penetrating a host cells tissues.

Question 43

A holozoic protozoan ingests food particles by the process of ________________.