Question 1

All photosynthetic protists

Accepted Answer

All photosynthetic protists, such as algae and diatoms, carry out oxygenic photosynthesis using two photosystems. This means they use both photosystem I and photosystem II in their electron transport chain to produce oxygen as a byproduct of photosynthesis.

Question 2

A typical Euglena cell is elongated and bounded by a _________________

Accepted Answer

D

Question 3

The pellicle of a Euglena cell consists of

Accepted Answer

The pellicle of a Euglena cell consists of protein strips and microtubules.

Question 4

Trypanosomes that cause disease in humans escape destruction by the human immune system because they are resistant to phagocytosis.

Accepted Answer

Trypanosomes evade the human immune system through antigenic variation, frequently changing their surface glycoproteins to avoid recognition and destruction, rather than being resistant to phagocytosis.

Question 5

The most common method of asexual reproduction in protists is

Accepted Answer

Fission is the most common method of asexual reproduction in protists. In fission, the protist divides into two identical daughter cells. Budding is also a common method, but not as common as fission. Cytokinesis refers to the division of the cytoplasm and is a necessary step in both fission and budding. Fragmentation involves the breaking of the protist into smaller pieces, each of which can develop into a new organism.

Question 6

Some anaerobic protists obtain energy using

Accepted Answer

Anaerobic protists can obtain energy using hydrogenosomes, organelles that produce ATP through the fermentation of pyruvate into hydrogen gas and carbon dioxide. Therefore, option C is the correct answer. Options A and B are incorrect as they are related to aerobic respiration, which requires oxygen. Option D is incorrect as not all anaerobic protists necessarily use all of these organelles.

Question 7

The simultaneous use of both organic and inorganic forms of carbon is called

Accepted Answer

Mixotrophy is the combination of using both organic and inorganic forms of carbon. Osmotrophy refers specifically to the uptake of dissolved organic matter, while omnitrophy is a broader term that refers to organisms that can obtain energy and nutrients from a variety of sources. Metatrophy is not a known term in microbiology.

Question 8

The cellulase-excreting protist that can account for up to one-third of the biomass of a termite is a member of the genus

Accepted Answer

The cellulase-excreting protist that can account for up to one-third of the biomass of a termite is a member of the genus Trichonympha.

Question 9

Which of the following is rare among protists?

Accepted Answer

Multicellularity is rare among protists. Most protists are unicellular.

Question 10

Which of the following statements is not true of protists?

Accepted Answer

Some protists are known to cause diseases in humans, such as Plasmodium species which cause malaria.

Question 11

When protists feed on solid nutrients such as bacteria by phagocytosis,they are said to be using ____________ nutrition.

Accepted Answer

Holozoic nutrition involves feeding on solid nutrients by engulfing them through phagocytosis. Saprozoic nutrition involves absorption of nutrients directly from decaying organic matter. Endozoic nutrition involves living inside the host organism and feeding on its tissues. Parasitic nutrition involves living on or inside another organism and feeding on its tissues without killing it immediately.

Question 12

Unlike Giardia,most members of the Fornicata are harmless symbionts.

Accepted Answer

While some members of Fornicata can be parasitic, most are harmless symbionts found in the guts of animals, where they assist in digestion and help break down complex organic compounds. Giardia, however, is a parasitic species of Fornicata that can cause diarrhea and other digestive problems in humans and other animals.

Question 13

Acellular slime molds form a large multinucleate mass called a(n)______________.
Blooms Level: 1.Remember
Learning Outcome: 25.03.03 Compare and contrast the structure,motility,and life cycles of acellular and cellular slime molds
Section: 25.03

Accepted Answer

The answer of Acellular slime molds form a large multinucleate...

Question 14

Recent evidence suggests that hydrogenosomes and mitochondria evolved from different endosymbiotically derived organelles.

Accepted Answer

Hydrogenosomes and mitochondria are thought to have evolved from the same endosymbiotic event involving an ancestral alpha-proteobacterium. Both organelles share a common evolutionary origin, but have diverged significantly in function and structure in different organisms.

Question 15

Which of the following is found in the intestine of termites and produces enzymes needed to digest wood particles?

Accepted Answer

Trichonymphida is a group of flagellated protists found in the intestine of termites that produce enzymes needed to digest wood particles. Giardia and Trichomonas are parasitic protists that infect humans and animals. Nyctotherus is a ciliate protist found in the rumen of cows.

Question 16

The study of algae is referred to as

Accepted Answer

The study of algae is referred to as phycology.

Question 17

Pigment is contained in an eyespot or __________ that helps certain organisms orient to light.
ASM

Accepted Answer

The answer of Pigment is contained in an eyespot or...

Question 18

Euglena use a contractile vacuole for osmotic regulation.
ASM

Accepted Answer

Euglena use a contractile vacuole to regulate the osmotic pressure inside the cell by expelling excess water.

Question 19

Which of the following is a unique organelle found within some protists but not in higher animal cells?

Accepted Answer

The contractile vacuole is a unique organelle found within some protists, like amoebas and paramecia, which helps to regulate osmotic pressure and remove excess water from the cell. Mitochondria, Golgi apparatus, and endoplasmic reticulum are all found in higher animal cells as well as in some protists.

Question 20

A trophozoite is a life cycle stage involved in

Accepted Answer

A trophozoite is a stage in the life cycle of some parasites, such as protozoa and helminths, where it actively feeds and grows within its host. This stage is important for the reproduction and propagation of the parasite.

Quiz 25: The Protists