Question 1

Diatoms

Accepted Answer

Diatoms are photosynthetic organisms with frustules composed of two halves and they can reproduce asexually. They are not motile by virtue of having flagella.

Question 2

The Stramenopila are a very large and diverse group that all possess __________ at some point in their life cycle.

Accepted Answer

The term "heterokont" literally means "different flagella" and refers to the unique paired flagella possessed by many Stramenopila. Therefore, D is the correct answer as it describes a characteristic feature of this group. While some Stramenopila, such as diatoms, possess chloroplasts, this is not a universal feature of the group. Conversely, neither an exoskeleton nor a macronucleus is found in all members of the Stramenopila.

Question 3

Which of the following is not a type of pseudopod found in protozoa?

Accepted Answer

Only options A, C, and D are types of pseudopods found in protozoa. There is no such thing as peripodia.

Question 4

A cyst formed by a protist functions

Accepted Answer

A cyst formed by a protist functions both as a protective mechanism against adverse changes in the environment and in transfer from one host to the next. The cyst provides protection to the protist during unfavorable conditions such as desiccation, heat, and lack of nutrients. It also allows for the protist to be transferred from one host to another through fecal-oral transmission or other means.

Question 5

Most radiolaria have an internal skeleton made of

Accepted Answer

Most radiolaria have an internal skeleton that is composed of siliceous (silica-based) material.

Question 6

Some ciliophora can discharge toxic threadlike darts called ___________ which are used in capturing prey.

Accepted Answer

The term "toxicysts" refers to small, capsule-like structures found in some ciliates that contain toxic substances. These substances may be used to capture prey, deter predators, or as a form of self-defense. In contrast, "spikes" and "spicules" typically refer to sharp, pointed structures that provide physical support or protection rather than a chemical defense mechanism. "Toxipodia" is not a commonly used term in ciliophora biology.

Question 7

Diatoms have a distinctive two-piece wall of silica called a frustule.
ASM

Accepted Answer

Diatoms are a type of algae that have a unique cell wall composed of two interlocking halves made of silica, called a frustule.

Question 8

__________ from foraminifera make up the White Cliffs of Dover and the stones used to build the great pyramids.
ASM

Accepted Answer

The answer of __________ from foraminifera make up the White...

Question 9

Foraminifera are a type of protist that

Accepted Answer

Foraminifera have a hard shell and their fossils can be used to estimate the age of ocean deposits. They do not move by flagella, cause malaria, or are associated with human disease.

Question 10

A protist with two flagella where one is wrapped around a transverse groove and the other is drapped in a longitudinal grove would be a member of which group?

Accepted Answer

Dinoflagellates have two flagella, one runs longitudinally, and another runs transversely in grooves.

Question 11

Apicomplexan organisms such as Plasmodium possess a motile,infective stage called the

Accepted Answer

The motile, infective stage in apicomplexan organisms such as Plasmodium is called sporozoite. Trophozoite refers to the growing stage in the life cycle of some protozoa, while apizoite is not a recognized term in biology.

Question 12

Filopodia supported by microtubules that are used primarily in feeding are called

Accepted Answer

Axopodia are filopodia that are supported by microtubules and are used primarily in feeding. Lobopodia are broad, flat pseudopodia used for crawling and adhesion. Reticulopodia are branching pseudopodia used for entrapment and feeding. Micropodia are not a commonly used term in cell biology.

Question 13

Which of the following groups is responsible for toxic red tides?

Accepted Answer

Dinoflagellates are responsible for toxic red tides, which occur when there is a bloom (abundance) of these single-celled organisms in the ocean. The toxins they produce can harm marine life and humans who consume seafood contaminated with the toxins.

Question 14

Species of dinoflagellates are responsible for much of the phosphorescence seen in ocean waters at night.

Accepted Answer

Dinoflagellates are bioluminescent, meaning they are capable of producing light through chemical reactions within their cells, and can cause the "glowing" phenomenon often observed in the ocean at night.

Question 15

Those dinoflagellates that live in an intimate association with corals are called

Accepted Answer

Dinoflagellates that live in an intimate association with corals are called zooxanthellae.

Question 16

Protist cells that produce gametes for sexual reproduction are most specifically called ___________.
Blooms Level: 1.Remember
Learning Outcome: 25.01.06 Outline the process of sexual reproduction and how it can vary in protists
Section: 25.01

Accepted Answer

The answer of Protist cells that produce gametes for sexual...

Question 17

_____________ produce 40 to 50 percent of the organic carbon in the ocean.

Accepted Answer

The answer of _____________ produce 40 to 50 percent of...

Question 18

Which of the following is not true regarding Entamoeba histolytica?

Accepted Answer

Entamoeba histolytica has the potential to penetrate the intestinal wall and cause extraintestinal infections such as liver abscesses. Therefore, it is not always confined to the intestinal tract during an infection.

Question 19

An organelle similar to a flagellum that differs from a flagellum in the arrangement of microtubules is called a(n)

Accepted Answer

An organelle similar to a flagellum that differs from a flagellum in the arrangement of microtubules is called a haptonema.

Question 20

Sexual reproduction in the cellular slime mold Dictyostelium discoideum involves the production of special spores called

Accepted Answer

Sexual reproduction in Dictyostelium discoideum involves the production of macrocysts, which are special spores that can withstand harsh conditions and germinate into new individuals when conditions become favorable.

Quiz 25: The Protists