Question 1

Which of the following best describes the primary difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus, while eukaryotic cells contain a nucleus.

Question 2

Which of the following is an example of an endemic disease?

Accepted Answer

Malaria in certain regions of Africa

Question 3

Which scientist is credited with developing a set of postulates to link specific microorganisms to specific diseases?

Accepted Answer

Robert Koch

Question 4

Which of the following best explains why Gram-negative bacteria are generally more resistant to antibiotics than Gram-positive bacteria?

Accepted Answer

Gram-negative bacteria have an outer membrane that restricts entry of many antibiotics.

Question 5

Which of the following equations correctly represents the calculation for bacterial population growth under ideal conditions?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 6

Which of the following is NOT a function of the normal microbial flora?

Accepted Answer

Causing disease under all circumstances

Question 7

Which of the following best describes antigenic drift?

Accepted Answer

Small, gradual genetic changes in viral antigens due to point mutations

Question 8

Which of the following is a physical method of microbial control?

Accepted Answer

Autoclaving

Question 9

Which of the following statements about plasmids is TRUE?

Accepted Answer

Plasmids often carry genes for antibiotic resistance.

Question 10

Which of the following best describes the role of vaccines in public health?

Accepted Answer

Vaccines stimulate the immune system to provide protection against specific diseases.

Question 11

Which of the following is a correct comparison between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration uses other molecules such as nitrate or sulfate.

Question 12

Which of the following is a food-borne pathogen and the disease it causes?

Accepted Answer

Salmonella enterica – Salmonellosis

Question 13

Which of the following best describes the process of transcription in prokaryotes?

Accepted Answer

The synthesis of mRNA from a DNA template

Question 14

Which of the following is a method used to estimate the number of microorganisms in a sample?

Accepted Answer

Viable plate count

Question 15

Which of the following is a characteristic of viruses that distinguishes them from cellular organisms?

Accepted Answer

Viruses lack cellular structure and cannot reproduce independently.

Question 16

Which of the following is a correct statement about the genetic code?

Accepted Answer

It is a set of three-nucleotide sequences in mRNA that specify amino acids.

Question 17

Which of the following is a correct example of a multi-step aseptic technique in the laboratory?

Accepted Answer

Flaming the loop, opening the culture tube, transferring bacteria, and reflaming the loop

Question 18

Which of the following is a correct description of a pandemic?

Accepted Answer

A disease outbreak that spreads across multiple countries or continents

Question 19

Which of the following is a correct statement about antibiotic resistance?

Accepted Answer

It can develop through genetic mutations or acquisition of resistance genes via plasmids.

Question 20

Which of the following is a correct example of a host defense mechanism against infection?

Accepted Answer

Production of antibodies by B cells

Microbiology for Non-Science Majors: Course Overview and Study Guide

Study Guide - Practice Questions