Question 1

Which of the following statements best explains why viruses are not considered living organisms?

Accepted Answer

They cannot carry out metabolic processes or reproduce without a host cell.

Question 2

A microbiologist is working with a bacterium that forms endospores and is known for causing botulism. Which genus is she most likely studying?

Accepted Answer

Clostridium

Question 3

During the lytic cycle of a bacteriophage, which of the following steps occurs immediately after the viral genome enters the host cell?

Accepted Answer

Biosynthesis

Question 4

Which of the following best describes the difference in ploidy number during mitosis and meiosis?

Accepted Answer

Mitosis keeps the ploidy number the same; meiosis halves it.

Question 5

A scientist isolates a microorganism from a hot spring with temperatures above $$80^\circC $$and high acidity. Which term best describes this organism?

Accepted Answer

Thermoacidophile

Question 6

Which of the following statements about the pGLO plasmid experiment is correct?

Accepted Answer

Bacteria with the pGLO plasmid will grow and glow on LB/AMP/ARA plates.

Question 7

Which of the following is a key difference between Archaea and Bacteria?

Accepted Answer

Archaea often live in extreme environments and have unique membrane lipids.

Question 8

Which of the following best describes the function of the catalase test in microbiology labs?

Accepted Answer

It detects the enzyme that breaks down hydrogen peroxide into water and oxygen.

Question 9

A blood agar plate shows a clear, colorless zone around bacterial colonies. What type of hemolysis is this, and what does it indicate?

Accepted Answer

Beta hemolysis; complete lysis of red blood cells

Question 10

Which of the following genome types is most similar to the host cell's genetic material in eukaryotic cells?

Accepted Answer

dsDNA

Question 11

Which of the following statements about alternation of generations in algae is correct?

Accepted Answer

It alternates between haploid and diploid multicellular stages.

Question 12

A protozoan is observed to have membrane-bound sacs (alveoli) beneath its plasma membrane. To which group does it most likely belong?

Accepted Answer

Alveolates

Question 13

Which of the following best describes the process of binary fission?

Accepted Answer

A prokaryotic cell duplicates its DNA and splits into two identical cells.

Question 14

Which of the following statements about viroids is correct?

Accepted Answer

Viroids are small, circular RNA molecules that infect plants.

Question 15

In the lysogenic cycle of a bacteriophage, what happens to the viral genome after it enters the host cell?

Accepted Answer

It integrates into the host genome and can remain latent.

Question 16

Which of the following best explains how some viruses can cause cancer in humans?

Accepted Answer

They integrate their genome into host DNA, potentially disrupting normal cell cycle regulation.

Question 17

Which of the following is a correct statement about the oxidase test?

Accepted Answer

A positive result is indicated by a color change on a test strip, showing cytochrome c oxidase activity.

Question 18

Which of the following best describes the source of the viral envelope in enveloped viruses?

Accepted Answer

It is derived from the host cell's membrane during viral exit.

Question 19

Which of the following is true about the ELISA technique?

Accepted Answer

It is used to detect the presence of specific antigens or antibodies in a sample.

Question 20

Which of the following statements about prokaryotes and eukaryotes is correct?

Accepted Answer

Eukaryotes have a nucleus; prokaryotes do not.

Microbiology Study Guide: Prokaryotes, Eukaryotes, Viruses, and Laboratory Techniques

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