Protozoans

Question 1

Cilia and flagella are similar in _____

Answer 1

their internal structure

Question 2

The sliding microtubule hypothesis explains

Answer 2

ciliary and flagellar action

Question 3

Most of the amebas reproduce by

Answer 3

binary fission

Question 4

A resistant, quiescent stage in the life cycle of a protozoan is called a

Answer 4

cyst

Question 5

The agents of red tide, which may be red, brown, yellow, or colorless, are the ___

Answer 5

dinoflagellates

Question 6

African sleeping sickness and Chagas’s disease are both caused by protozoa in the genus _____

Answer 6

Trypanasoma

Question 7

Mental retardation of a child can be caused by infection of its mother by the protistan _____ during the child’s fetal development. This may be the simple result of the mother changing a cat litter box while pregnant

Answer 7

Toxoplasma

Question 8

The agent of malaria, which kills one million people each year globally, is the protistan _______

Answer 8

Plasmodium

Question 9

Some amebas make a protective shell or test. Those that construct this shell of calcium carbonate are the ______

Answer 9

foraminiferans

Question 10

Amebas that construct their shell or test of siliceous material, and are also found in marine waters are the ______

Answer 10

radiolarians

Question 11

While many amebas are heterotrophic, a few are endoparasites. The agent of amoebic dysentery is the protistan _____

Answer 11

Entamoeba histolytica.

Question 12

All members of phylum Apicomplexa share two features, which are ____ and _____

Answer 12

an apical complex; endoparasitism.

Question 13

Which of the following disease agents does a vector mosquito transmit?

Answer 13

the protistan Plasmodium vivax.

Question 14

The members of phylum Ciliophora usually have cilia but the one trait that characterizes them is being _____

Answer 14

multinucleate

Question 15

The members of phylum Ciliophora have complex reproductive cycles, but they usually include ____ and ____

Answer 15

asexual binary fission: conjugation.

Question 16

Which of the following is not a form of asexual reproduction used by protists?

Answer 16

conjugation

Question 17

The infective stage in the life cycle of a sporozoan is the ___

Answer 17

oocyst

Question 18

When cilia are fused into a sheet of material that can be used for locomotion or for moving food particles toward the cytopharynx, the sheet is called a(n) ____

Answer 18

undulating membrane.

Question 19

Another term for the joining of two gametes is _____

Answer 19

syngamy

Question 20

Some ciliates have cilia fused to form stiffened tufts called _______

Answer 20

cirri

Question 21

Unlike most of the other kinds of protists, the __________ exist in a diploid state most of the life cycle and meiosis precedes syngamy.

Answer 21

ciliates

Question 22

When a person becomes infected with the protist Plasmodium, sporozoites enter the liver cells and undergo a process known as _________, producing merozoites which then enter red blood cells.

Answer 22

schizogony

Question 23

Some of the oldest known fossils of eukaryotic organisms that have been identified are members of the group called _____

Answer 23

radiolarians

Question 24

Movement by pseudopodia is used by a variety of protozoa including amebas.

Answer 24

true

Question 25

The arrangement of microtubules within a flagella is similar to the internal structure of another organelle, the mitochondrion.

Answer 25

false

Question 26

Contractile vacuoles are mainly functional in regulating water within the cell, and are most active in freshwater protozoans.

Answer 26

true

Question 27

Respiration exchanges in protists occur via specialized membranous organelles.

Answer 27

false

Question 28

Lobopodia are large and blunt, contain both endoplasm and ectoplasm.

Answer 28

true

Question 29

Zygotic meiosis is meiosis that occurs after fertilization such as in Apicomplexa.

Answer 29

true

Question 30

Intermediary meiosis is meiosis that occurs between haploid and diploid generations such as in foraminiferans.

Answer 30

true

Question 31

Conjugation is when gametic nuclei are exchanged between individuals such as inPlasmodium.

Answer 31

false

Question 32

It is believed that the green algae gave rise to multicellular plants.

Answer 32

true

Question 33

Undulipodia is the term that has been given to the various types of pseudopodia.

Answer 33

false

Question 34

One difference between pseudopodia and flagella and cilia is that pseudopodia are bound by the cell membrane, whereas flagella and cilia are naked extensions of microtubules.

Answer 34

false

Question 35

Multiple fission is common in the apicomplexans and some amebas, and is also known as schizogony.

Answer 35

true

Question 36

The amebas, Plasmodium, Paramecium, and Euglena all belong to different phyla.

Answer 36

true

Question 37

Many species of foraminiferans live in a close symbiotic relationship with stony corals, and are very important in the formation and maintenance of coral reefs.

Answer 37

false

Question 38

Toxoplasmosis typically does not cause disease symptoms in healthy humans, but may pose a threat to HIV-infected persons, the elderly, and pregnant women.

Answer 38

true

Question 39

The protozoans are characterized by the _____ grade of organization.

Answer 39

protoplasmic

Question 40

The protozoans acquire energy using the _______

Answer 40

mitochondria

Question 41

Locomotion using _____ involves transforming cytoplasm between the sol to gel states.

Answer 41

pseudopodia

Question 42

Protozoans that ingest visible food particles are referred to as _____ feeders.

Answer 42

phagotrophic

Question 43

Specialized structures called ____ maintain osmotic balance in most protozoans.

Answer 43

contractile vacuoles