Q: Which of the following is a correct balanced equation for the citric acid cycle (Krebs cycle)?

$$\text{Acetyl-CoA} + 3\,NAD^+ + 1\,GDP + 1\,Pi + 1\,FAD \rightarrow 2\,CO_2$ + 3\,NADH + 1\,$$FADH_2$$ + 1\,GTP$$

Question 1

Which scientific term is used to classify life that uses inorganic molecules as an energy source?

Accepted Answer

Chemolithotroph

Question 2

A microorganism that uses organic molecules as an energy source and carbon dioxide as a carbon source is best classified as which of the following?

Accepted Answer

Chemoautotroph

Question 3

Convert the average diameter of a bacterial cell, $$2 \, \mu m$$, to millimeters.

Accepted Answer

$$0.0002 \, mm$$

Question 4

Which of the following best describes the function of the bacterial cell wall?

Accepted Answer

It prevents osmotic lysis and determines cell shape.

Question 5

Which linkage is found in the phospholipids of Bacteria?

Accepted Answer

Ester linkage

Question 6

Which of the following statements about fermentation is correct?

Accepted Answer

The source of energy is an organic molecule.

Question 7

In chemolithotrophs, which molecule is typically used as the electron acceptor?

Accepted Answer

$$O_2$$

Question 8

Which of the following is a correct balanced equation for the citric acid cycle (Krebs cycle)?

Accepted Answer

$$	ext{Acetyl-CoA} + 3\,NAD^+ + 1\,GDP + 1\,Pi + 1\,FAD ightarrow 2\,CO_2$ + 3\,NADH + 1\,$$FADH_2$$ + 1\,GTP$$

Question 9

Which of the following best describes the function of the cytoplasmic membrane in bacteria?

Accepted Answer

It acts as a permeability barrier.

Question 10

Which of the following statements about glycolysis in chemotrophs is TRUE?

Accepted Answer

NAD+ is reduced in glycolysis stage II.

Question 11

Which of the following best describes the electron donor and acceptor in the aerobic respiration of glucose?

Accepted Answer

$$O_2 is $$the electron acceptor, glucose is the electron donor.

Question 12

Which of the following is a function of the cell wall in bacteria?

Accepted Answer

Regulation of water and solute movement

Question 13

Which of the following best describes the structure of a Gram-positive cell wall?

Accepted Answer

Thick peptidoglycan layer and no outer membrane

Question 14

Which of the following is required to initiate translation in bacteria?

Accepted Answer

The f-Methionine tRNA to the start codon

Question 15

A cell is observed under the microscope and is found to be about $$200 \, nm in $$diameter, has an S-layer, and is coccus in shape. Which type of microorganism is this most likely to be?

Accepted Answer

An archaeon

Question 16

Which of the following best describes the evolutionary origin of mitochondria?

Accepted Answer

They evolved from the ancestor of Bacteria.

Question 17

Which of the following is the correct order of the electron transport chain components in aerobic respiration?

Accepted Answer

NADH → electron transport chain → $$O_2$$

Question 18

Which of the following is a distinguishing feature of phospholipids in Archaea compared to Bacteria?

Accepted Answer

Archaea have ether linkages in their phospholipids.

Question 19

Which of the following best describes the role of the cell wall in preventing osmotic lysis?

Accepted Answer

It provides structural support to resist internal turgor pressure.

Question 20

Which of the following best describes the function of the Pribnow box in bacterial transcription?

Accepted Answer

It is the binding site for RNA polymerase during transcription initiation.

Microbial Cell Structure, Metabolism, and Bioenergetics: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards