Question 1

In bacteria, photosynthetic pigments are primarily found in which cellular structure?

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 method is most effective for sterilizing heat-labile solutions?

Accepted Answer

Filtration

Question 5

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

Accepted Answer

Culture density

Question 6

Which of the following is a thermophile?

Accepted Answer

Thermus aquaticus

Question 7

Facultative anaerobes are best described as organisms that:

Accepted Answer

Can grow with or without oxygen

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

Cannot sterilize heat-sensitive materials

Question 11

Which of the following best describes a chemoheterotroph?

Accepted Answer

Uses organic compounds for both energy and carbon

Question 12

Which method do disinfectants use to disrupt the plasma membrane?

Accepted Answer

Solubilization of lipids

Question 13

In green and purple bacteria, electrons to reduce CO$$_2$$ can come from:

Accepted Answer

Hydrogen sulfide

Question 14

A strictly fermentative bacterium produces energy by:

Accepted Answer

Fermentation

Question 15

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

Accepted Answer

Extracellular enzymes

Question 16

Which equation best represents the process of osmosis?

Accepted Answer

$$ \Delta \Psi = \Psi_{inside} - \Psi_{outside} $$

Question 17

Which of the following is a limitation of using chemical disinfectants?

Accepted Answer

They may not kill endospores

Question 18

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

Accepted Answer

Fermentation of dairy products

Question 19

Which of the following is TRUE about facilitated diffusion?

Accepted Answer

It moves substances down their concentration gradient

Question 20

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

Accepted Answer

Facilitate movement of water

Microbiology Exam 1 Study Guide: Cell Structure, Metabolism, Sterilization, and Transport Mechanisms

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