Q: A student is given the atomic weights of carbon ($$12$$), hydrogen ($$1$$), and oxygen ($$16). $$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 one of the domains?

Accepted Answer

Protista

Question 3

Which structure is present in all prokaryotic cells?

Accepted Answer

Plasma membrane

Question 4

Which scientist developed the formal system of classifying and naming organisms that is still in use today?

Accepted Answer

Carl Linnaeus

Question 5

A student is given the atomic weights of carbon ($$12$$), hydrogen ($$1$$), and oxygen ($$16). $$What is the molecular weight of methanol ($$CH_3OH$$)?

Accepted Answer

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

Question 6

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom

Question 7

Which of the following statements about acids and bases is correct?

Accepted Answer

A base is a substance that accepts $$H^+$$ ions in solution

Question 8

Which of the following best describes the process of fermentation?

Accepted Answer

The breakdown of organic molecules in the absence of oxygen to produce energy, acids, or alcohols

Question 9

Which of the following is a correct statement about the structure of DNA compared to RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil

Question 10

A patient is suspected of having tuberculosis. Which staining technique would be most appropriate to confirm the presence of Mycobacterium tuberculosis in a sputum sample?

Accepted Answer

Acid-fast staining

Question 11

Which of the following microscopes achieves the highest magnification and greatest resolution?

Accepted Answer

Transmission electron microscope

Question 12

Which of the following is the correct order of steps in the Gram staining procedure?

Accepted Answer

Crystal violet, iodine, alcohol, safranin

Question 13

A solution has a pH of $$4. $$What is the concentration of $$H^+$$ ions in the solution?

Accepted Answer

$$1 	imes 10$$^{-4}$$ M

Question 14

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

Accepted Answer

The association of two or more polypeptide chains to form a functional protein

Question 15

Which of the following functional groups is found in all amino acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 16

Which of the following statements about the plasma membrane is correct?

Accepted Answer

Steroids such as cholesterol decrease membrane fluidity at high temperatures

Question 17

Which of the following best describes a neutralization reaction?

Accepted Answer

An acid reacts with a base to produce a salt and water

Question 18

Which of the following microscopes is best suited for observing living cells in their natural state without staining?

Accepted Answer

Phase-contrast microscope

Question 19

A compound microscope has an objective lens with $$40	imes$$ magnification and an ocular lens with $$10	imes$$ magnification. What is the total magnification?

Accepted Answer

$$400	imes$$

Question 20

Which of the following statements about Koch’s postulates is correct?

Accepted Answer

They are used to prove that a specific microorganism causes a specific disease

Microbiology Exam Review: Key Concepts and Step-by-Step Study Guidance

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