Question 1

Which of the following is a feature unique to eukaryotic cells and not found in prokaryotic cells?

Accepted Answer

Membrane-bound organelles

Question 2

A scientist is examining a bacterial sample under a light microscope after performing a Gram stain. The cells appear purple. What can be inferred about the structure of their cell wall?

Accepted Answer

They have a thick layer of peptidoglycan and no outer membrane.

Question 3

Which of the following best describes the function of the capsule in bacteria?

Accepted Answer

It protects bacteria from phagocytosis and aids in immune evasion.

Question 4

During Gram staining, which step is responsible for differentiating between Gram-positive and Gram-negative bacteria?

Accepted Answer

Decolorization with alcohol or acetone

Question 5

Which of the following statements about prokaryotic and eukaryotic DNA is correct?

Accepted Answer

Prokaryotic DNA is circular and not enclosed in a nucleus.

Question 6

A patient is diagnosed with tuberculosis, caused by Mycobacterium tuberculosis. Which staining technique would be most appropriate to identify this bacterium in a clinical sample?

Accepted Answer

Acid-fast stain

Question 7

Which of the following best explains why enzymes are necessary for most biochemical reactions in living cells?

Accepted Answer

They decrease the activation energy, allowing reactions to occur at cellular temperatures.

Question 8

Which of the following is the final electron acceptor in aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 9

A bacterial cell is placed in a solution with a higher concentration of solutes than inside the cell. What will most likely happen to the cell?

Accepted Answer

Water will leave the cell, causing it to shrink.

Question 10

Which of the following statements about the structure of flagella in prokaryotes is correct?

Accepted Answer

Flagella are composed of the protein flagellin and rotate like a propeller.

Question 11

Which of the following best describes the difference between competitive and allosteric enzyme inhibitors?

Accepted Answer

Competitive inhibitors bind to the active site, while allosteric inhibitors bind to a different site, changing the enzyme's shape.

Question 12

Which of the following is true regarding the Gram-negative bacterial cell wall?

Accepted Answer

It contains an outer membrane with lipopolysaccharides.

Question 13

Which process is responsible for the movement of molecules from an area of high concentration to an area of low concentration without the use of energy?

Accepted Answer

Facilitated diffusion

Question 14

Which of the following best describes the difference between catabolism and anabolism?

Accepted Answer

Catabolism breaks down large molecules into smaller ones, releasing energy; anabolism builds larger molecules from smaller ones, requiring energy.

Question 15

During the electron transport chain, how many ATP molecules are typically produced from the oxidation of one molecule of NADH?

Accepted Answer

$$3$$

Question 16

Which of the following is the correct order of taxonomic classification from broadest to most specific?

Accepted Answer

Domain, kingdom, phylum, class, order, family, genus, species

Question 17

Which of the following best describes the function of pili in bacteria?

Accepted Answer

They are involved in conjugation and attachment to surfaces.

Question 18

Which of the following statements about endospores is correct?

Accepted Answer

Endospores are resistant to heat, desiccation, and chemicals.

Question 19

Which of the following is an example of an exergonic reaction in cellular metabolism?

Accepted Answer

Breakdown of glucose during glycolysis

Question 20

When naming a microorganism using binomial nomenclature, which part is capitalized and which part is lowercase?

Accepted Answer

Genus is capitalized, species is lowercase

Microbiology Study Guide: Cell Structure, Staining, Metabolism, and Taxonomy

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