Question 1

In bacteria, photosynthetic pigments are primarily found in which of the following structures?

Accepted Answer

Thylakoid membranes

Question 2

Which of the following is NOT a component that a prokaryotic cell may possess?

Accepted Answer

Nucleus

Question 3

The infectious agent that causes AIDS is classified as a:

Accepted Answer

Virus

Question 4

Which of the following is the best method to sterilize heat-labile solutions?

Accepted Answer

Filtration

Question 5

The terms 'turbid' and 'turbine' are generally associated with which laboratory measurement?

Accepted Answer

Cell density in a liquid culture

Question 6

Which of the following best describes a thermophile?

Accepted Answer

An organism that thrives at high temperatures

Question 7

Which of the following is most commonly used for surgical hand scrubs?

Accepted Answer

Chlorhexidine

Question 8

Which chemical agent is commonly used for sterilization in food preservation methods?

Accepted Answer

Ethylene oxide

Question 9

Which of the following statements about Cyanobacteria is TRUE?

Accepted Answer

They perform oxygenic photosynthesis

Question 10

Which of the following is a limitation of the autoclave?

Accepted Answer

It cannot sterilize heat-sensitive materials

Question 11

Disinfectants primarily act by which of the following mechanisms?

Accepted Answer

Disrupting the plasma membrane

Question 12

In green and purple bacteria, electrons to reduce $$CO_2$$ can come from:

Accepted Answer

Hydrogen sulfide ($$H_2S)$$

Question 13

A strictly fermentative bacterium produces energy by which process?

Accepted Answer

Fermentation

Question 14

Which of the following is NOT a method of cell transport?

Accepted Answer

Extracellular enzymes

Question 15

Which of the following best describes a chemoheterotroph?

Accepted Answer

An organism that uses chemicals as an energy source and organic compounds as a carbon source

Question 16

Which of the following is a common commercial benefit of lactic acid bacteria?

Accepted Answer

Fermentation of dairy products

Question 17

Which of the following is a limitation of using disinfectants?

Accepted Answer

They may not kill endospores

Question 18

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient via a protein channel

Question 19

Which of the following is NOT a limitation of the autoclave?

Accepted Answer

Cannot sterilize glassware

Question 20

Which of the following is a function of aquaporins in the cell membrane?

Accepted Answer

Facilitate the diffusion of water

Microbiology Exam 1 Study Guide: Cell Structure, Metabolism, and Microbial Control

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