Question 1

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the attraction between oppositely charged ions.

Question 2

Which chemical reaction type is responsible for breaking down large molecules into smaller subunits, such as during digestion?

Accepted Answer

Decomposition reaction

Question 3

What is the main function of ATP in living cells?

Accepted Answer

Transfers the chemical energy released during reactions

Question 4

Which of the following is NOT a characteristic of water that makes it important for living organisms?

Accepted Answer

Serves as a major energy source for cells

Question 5

Which type of bond is responsible for holding together the atoms of most molecules in organisms?

Accepted Answer

Covalent bond

Question 6

A solution with a pH of 3 is considered:

Accepted Answer

Acidic

Question 7

Which of the following statements about organic compounds is TRUE?

Accepted Answer

They are structurally complex and always contain carbon and hydrogen.

Question 8

Which macromolecule is the main component of the cell walls of plants and most algae?

Accepted Answer

Cellulose

Question 9

What is the correct formula for the relationship between hydrogen ion concentration and pH?

Accepted Answer

$$\mathrm{pH} = -\log_{10}[\mathrm{H}^+]$$

Question 10

Which of the following is a function of lipids in living organisms?

Accepted Answer

Build membranes and store energy

Question 11

Which nitrogen-containing base is found in RNA but not in DNA?

Accepted Answer

Uracil

Question 12

Which of the following best describes a synthesis reaction?

Accepted Answer

A reaction in which two or more atoms, ions, or molecules combine to form a new, larger molecule.

Question 13

Which of the following is a polysaccharide that is the main food reserve in animals?

Accepted Answer

Glycogen

Question 14

Which type of chemical bond is formed when atoms share electrons?

Accepted Answer

Covalent bond

Question 15

Which of the following is NOT a function of proteins in cells?

Accepted Answer

Energy storage

Question 16

Which of the following statements about nucleic acids is correct?

Accepted Answer

RNA is usually single-stranded and contains ribose sugar.

Question 17

Which of the following is a weak bond that forms between a hydrogen atom covalently bonded to one oxygen or nitrogen atom and another oxygen or nitrogen atom?

Accepted Answer

Hydrogen bond

Question 18

Which of the following is an example of an inorganic compound?

Accepted Answer

Carbon dioxide

Question 19

Which of the following best describes the role of enzymes in chemical reactions?

Accepted Answer

They act as catalysts to speed up chemical reactions.

Question 20

Which of the following is the correct representation of a reversible chemical reaction?

Accepted Answer

$$A + B \rightleftharpoons AB$$

Chemical Principles in Microbiology: Structure, Bonds, and Biological Molecules

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