Question 1

Which of the following best describes a capsule in pathogenic bacteria?

Accepted Answer

A sticky, gelatinous layer that helps bacteria evade phagocytosis by host immune cells

Question 2

During Gram staining, why do Gram-positive bacteria appear purple while Gram-negative bacteria appear pink?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer that retains the crystal violet stain, while Gram-negative bacteria have a thin peptidoglycan layer and lose the stain during decolorization

Question 3

Which of the following is NOT a difference between prokaryotic and eukaryotic cells?

Accepted Answer

Both prokaryotes and eukaryotes have mitochondria

Question 4

Which of the following best describes the function of the Golgi complex in a eukaryotic cell?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles

Question 5

A patient is diagnosed with Lyme disease. Which of the following is the vector responsible for transmitting this disease?

Accepted Answer

Ixodes tick

Question 6

Which of the following statements about oxidative phosphorylation is correct?

Accepted Answer

It involves the transfer of electrons through the electron transport chain to generate a proton gradient used to synthesize ATP

Question 7

Which of the following best describes a halophile?

Accepted Answer

An organism that requires high salt concentrations for growth

Question 8

What is the main product of glycolysis?

Accepted Answer

Pyruvate

Question 9

Which of the following best describes the role of catalase in bacteria?

Accepted Answer

It breaks down hydrogen peroxide into water and oxygen

Question 10

A microbiologist is testing a bacterial culture for the presence of peptidoglycan. Where should they look for this molecule?

Accepted Answer

In the cell wall

Question 11

Which of the following best describes the process of transformation in bacteria?

Accepted Answer

Uptake of naked DNA from the environment by a bacterial cell

Question 12

Which of the following is a correct description of a chemoautotroph?

Accepted Answer

An organism that uses inorganic chemicals as an energy source and CO$$_2 as a $$carbon source

Question 13

Which of the following best explains why antibiotics that target peptidoglycan synthesis are more effective against Gram-positive bacteria?

Accepted Answer

Gram-positive bacteria have a thicker peptidoglycan layer, making them more susceptible to antibiotics that disrupt its synthesis

Question 14

Which of the following is a function of the bacterial flagellum?

Accepted Answer

Motility

Question 15

A scientist is studying a bacterium that can grow in the presence or absence of oxygen. Which term best describes this organism?

Accepted Answer

Facultative anaerobe

Question 16

Which of the following best describes the process of conjugation in bacteria?

Accepted Answer

Transfer of genetic material via a pilus from one bacterium to another

Question 17

Which of the following is a correct sequence of the bacterial growth curve?

Accepted Answer

Lag, log, stationary, death

Question 18

Which of the following best describes a competitive inhibitor in enzyme activity?

Accepted Answer

A molecule that binds to the active site of an enzyme, preventing substrate binding

Question 19

Which of the following statements about DNA in bacteria is correct?

Accepted Answer

Bacterial DNA is typically a single, circular chromosome located in the nucleoid region

Question 20

A patient presents with symptoms of Chagas disease. Which organism is the vector for this disease?

Accepted Answer

Triatomine (kissing) bug

Microbiology Midterm Review Guide: Key Concepts and Definitions

Study Guide - Practice Questions

Study Guide - Flashcards