$\mathrm{C_6H_{12}O_6} + 6\,O_2 \rightarrow 6\,CO_2 + 6\,H_2O + \text{energy}$

Question 1

Which scientist's experiment with meat and maggots provided evidence against the theory of spontaneous generation?

Accepted Answer

Francesco Redi

Question 2

Which of the following best describes the Germ Theory of Disease?

Accepted Answer

Diseases are caused by microorganisms invading host organisms.

Question 3

Which of the following is NOT a beneficial activity of microorganisms?

Accepted Answer

Causing infectious diseases

Question 4

According to Woese’s domain system, which characteristic differentiates Archaea from Bacteria?

Accepted Answer

Unique membrane lipids and absence of peptidoglycan

Question 5

Which structure is present in prokaryotes but absent in eukaryotes?

Accepted Answer

Peptidoglycan cell wall

Question 6

A bacterium is observed to have a thick peptidoglycan layer and no outer membrane. Which Gram reaction would it most likely show?

Accepted Answer

Gram-positive

Question 7

Which of the following best describes the process of facilitated diffusion?

Accepted Answer

Movement of molecules through a membrane via carrier proteins without energy input

Question 8

Which microscope would be most appropriate for viewing the surface details of a virus particle?

Accepted Answer

Scanning Electron Microscope (SEM)

Question 9

During the Gram stain procedure, what is the purpose of the iodine reagent?

Accepted Answer

To act as a mordant and fix the crystal violet dye

Question 10

Which equation correctly represents aerobic respiration?

Accepted Answer

$\mathrm{C_6H_{12}O_6} + 6\,O_2 ightarrow 6\,CO_2 + 6\,H_2O + 	ext{energy}$

Question 11

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is generated by transferring a phosphate group from a substrate molecule to ADP

Question 12

Which molecule acts as the final electron acceptor in aerobic respiration?

Accepted Answer

O$_2$

Question 13

In glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$2$

Question 14

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates NAD$^+$ allowing glycolysis to continue.

Question 15

Which of the following is a distinguishing feature of Gram-negative bacteria?

Accepted Answer

Presence of an outer membrane containing lipopolysaccharides

Question 16

Which of the following best explains the endosymbiotic theory?

Accepted Answer

Eukaryotic organelles such as mitochondria and chloroplasts originated from free-living prokaryotes engulfed by ancestral eukaryotes.

Question 17

Which of the following is NOT a method primarily used for taxonomic classification of microorganisms?

Accepted Answer

Gram staining

Question 18

Which of the following is a major advantage of being an aerobe compared to an anaerobe?

Accepted Answer

Higher energy yield from glucose metabolism

Question 19

Which of the following is a correct sequence of events in cellular respiration?

Accepted Answer

Glycolysis → Prep step → Citric acid cycle → Electron transport chain

Question 20

Which of the following is a correct description of chemiosmosis?

Accepted Answer

Movement of protons across a membrane to generate ATP via ATP synthase

Microbiology Study Aid: Key Concepts and Guidance

Study Guide - Practice Questions