Q: Which of the following equations correctly represents the hydrolysis of ATP to ADP and inorganic phosphate, releasing energy?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P_i} + \text{energy}$$

Question 1

Which of the following statements best describes the minimum structural components required for a virus to be infectious?

Accepted Answer

A protein capsid and a nucleic acid genome

Question 2

A researcher observes clear zones, called plaques, on a bacterial lawn after exposure to a viral sample. What is the most likely cause of these plaques?

Accepted Answer

Lysis of bacterial cells due to bacteriophage infection

Question 3

Which of the following best explains why viruses must be grown in living cells?

Accepted Answer

Viruses lack the metabolic machinery necessary for replication and depend on host cell processes

Question 4

Which of the following is NOT a possible form of genetic material found in viruses?

Accepted Answer

Ribosomal RNA

Question 5

During the lytic cycle of a bacteriophage, which step immediately follows the injection of viral DNA into the host cell?

Accepted Answer

Synthesis of viral components using host machinery

Question 6

Which of the following best distinguishes a prion from a viroid?

Accepted Answer

A prion is a misfolded protein, while a viroid is a small, circular RNA molecule

Question 7

Which of the following equations correctly represents the hydrolysis of ATP to ADP and inorganic phosphate, releasing energy?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 8

Which of the following best describes the role of NAD+ in cellular metabolism?

Accepted Answer

It acts as an electron carrier, accepting electrons during oxidation reactions

Question 9

A competitive inhibitor of an enzyme acts by:

Accepted Answer

Binding to the active site and preventing substrate binding

Question 10

Which of the following statements about glycolysis is correct?

Accepted Answer

ATP is generated by substrate-level phosphorylation during glycolysis

Question 11

Which of the following best explains why fermentation produces less ATP than aerobic respiration?

Accepted Answer

Fermentation does not utilize the electron transport chain or oxidative phosphorylation

Question 12

In the citric acid cycle, which molecule is regenerated at the end of each cycle, allowing the cycle to continue?

Accepted Answer

Oxaloacetate

Question 13

During aerobic respiration, most of the ATP is generated by which process?

Accepted Answer

Oxidative phosphorylation in the electron transport chain

Question 14

Which of the following best describes the function of ATP synthase?

Accepted Answer

It uses the proton gradient to synthesize ATP from ADP and inorganic phosphate

Question 15

Which of the following best explains why obligate anaerobes are killed by exposure to oxygen?

Accepted Answer

They lack enzymes such as superoxide dismutase and catalase to neutralize reactive oxygen species

Question 16

Which of the following equations represents the overall reaction for aerobic respiration of glucose?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 ightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 17

A bacterial culture is exposed to a high salt environment. What is the most likely effect on the cells if they are not halotolerant?

Accepted Answer

Water will leave the cells, causing plasmolysis

Question 18

Which of the following best describes a mesophile?

Accepted Answer

An organism that grows best at moderate temperatures, typically between 20°C and 45°C

Question 19

Which enzyme catalyzes the first reaction of the Calvin cycle, fixing carbon dioxide?

Accepted Answer

Ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO)

Question 20

A patient is infected with a pathogen that can grow in the presence or absence of oxygen, but grows better when oxygen is available. How would you classify this organism?

Accepted Answer

Facultative anaerobe

Microbiology Study Guide: Viruses, Microbial Metabolism, and Microbial Growth

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