Question 1

Which of the following best describes the main function of bacterial capsules and slime layers?

Accepted Answer

They assist in attachment to surfaces and prevent dehydration.

Question 2

A researcher observes a bacterium with a tightly attached, highly organized polysaccharide layer that is visible after India ink staining. What is this structure called?

Accepted Answer

Capsule

Question 3

Which of the following is a function of conjugative (sex) pili in bacteria?

Accepted Answer

Facilitating genetic exchange between cells

Question 4

Gas vesicles in cyanobacteria are primarily responsible for which of the following?

Accepted Answer

Conferring buoyancy

Question 5

Which cell inclusion allows bacteria to orient themselves along magnetic field lines?

Accepted Answer

Magnetosomes

Question 6

Endospores are highly resistant to environmental stresses. Which of the following is NOT a characteristic of endospores?

Accepted Answer

High water content (80-90%)

Question 7

Which of the following triggers the formation of bacterial endospores?

Accepted Answer

Limiting nutrient availability

Question 8

A bacterium is observed to migrate toward a capillary tube containing glucose. This behavior is best described as:

Accepted Answer

Chemotaxis

Question 9

Which arrangement of flagella would you expect to find on a bacterium with flagella distributed all over its surface?

Accepted Answer

Peritrichous

Question 10

Which of the following statements about mitochondria is TRUE?

Accepted Answer

They are the site of respiration and ATP production in aerobic eukaryotes.

Question 11

The endosymbiotic hypothesis is supported by which of the following observations?

Accepted Answer

Mitochondria and chloroplasts contain circular DNA and bacterial-like ribosomes.

Question 12

Which of the following is a key enzyme found in the stroma of chloroplasts and is essential for the Calvin cycle?

Accepted Answer

RuBisCO

Question 13

Which cytoskeletal element is primarily responsible for maintaining cell shape and facilitating chromosome movement during eukaryotic cell division?

Accepted Answer

Microtubules

Question 14

A eukaryotic cell is observed to have a large number of lysosomes. What is the primary function of these organelles?

Accepted Answer

Digestion and recycling of cellular components

Question 15

Which of the following best describes the difference between mitosis and meiosis in eukaryotic cells?

Accepted Answer

Mitosis results in two diploid cells, while meiosis results in four haploid cells.

Question 16

Which of the following structures is found in both Archaea and Eukarya and is involved in DNA packaging?

Accepted Answer

Histones

Question 17

A bacterium is exposed to a sudden increase in ionic strength in its environment. Which form of taxis would most likely be observed?

Accepted Answer

Osmotaxis

Question 18

Which of the following is a correct sequence for the three steps of endospore germination?

Accepted Answer

Activation, germination, outgrowth

Question 19

Fimbriae are most likely to be found on bacteria that:

Accepted Answer

Are either gram-negative or gram-positive and require attachment to surfaces

Question 20

Which of the following best explains why cell inclusions are enclosed by a thin protein membrane?

Accepted Answer

To reduce osmotic stress within the cell

Microbial Cell Structure and Function: Surface Structures, Inclusions, Endospores, Locomotion, and Eukaryotic Cell Features CH 2.2

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