Q: If the atomic weight of carbon is 12, hydrogen is 1, and oxygen is 16, what is the molecular weight of methanol ($$CH_3OH$$)?

$$12 + (3 \times 1) + 16 + 1 = 32$$

Question 1

Which of the following is an example of a beneficial use of microorganisms in industry?

Accepted Answer

Producing antibiotics such as penicillin

Question 2

A scientist isolates a new microorganism and wants to classify it. According to the three-domain system developed by Carl Woese, which of the following is NOT a domain?

Accepted Answer

Protista

Question 3

Which structure is responsible for the motility of protozoa?

Accepted Answer

Flagella

Question 4

Which of the following best describes the theory of spontaneous generation?

Accepted Answer

Living organisms can arise from non-living matter

Question 5

Which experiment provided strong evidence against spontaneous generation by demonstrating that microorganisms do not grow in boiled broth unless exposed to air?

Accepted Answer

Pasteur's swan-neck flask experiment

Question 6

Which of the following statements about viruses is correct?

Accepted Answer

Viruses can reproduce only inside a host cell

Question 7

Which scientist developed the formal system of classifying and naming organisms (binomial nomenclature)?

Accepted Answer

Carl Linnaeus

Question 8

A patient is diagnosed with a disease caused by a microorganism. According to Koch’s postulates, which step is necessary to confirm the causative agent?

Accepted Answer

The microorganism must be isolated from a diseased host and grown in pure culture

Question 9

Which of the following best defines a pathogen?

Accepted Answer

A microorganism that causes disease

Question 10

If the atomic weight of carbon is 12, hydrogen is 1, and oxygen is 16, what is the molecular weight of methanol ($$CH_3OH$$)?

Accepted Answer

$$12 + (3 	imes 1) + 16 + 1 = 32$$

Question 11

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from one atom to another

Question 12

Which of the following is the general formula for carbohydrates?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 13

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 14

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded

Question 15

A neutralization reaction occurs when hydrochloric acid ($$HCl) $$reacts with sodium hydroxide ($$NaOH). $$Which of the following is the salt produced in this reaction?

Accepted Answer

$$NaCl$$

Question 16

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy to its surroundings

Question 17

Which type of microscope achieves the highest magnification and greatest resolution?

Accepted Answer

Transmission electron microscope

Question 18

A specimen is observed under a compound microscope with an objective lens of $$40	imes$$ and an ocular lens of $$10	imes. $$What is the total magnification?

Accepted Answer

$$400	imes$$

Question 19

Which staining technique is used to identify bacteria with waxy cell walls, such as Mycobacterium tuberculosis?

Accepted Answer

Acid-fast staining

Question 20

Which of the following changes would increase the fluidity of a plasma membrane at low temperatures?

Accepted Answer

Increasing the proportion of unsaturated fatty acids

Microbiology Exam Review: Key Concepts and Study Guidance

Study Guide - Practice Questions

Study Guide - Flashcards