Question 1

Which of the following best describes the regulatory molecule released by a Salmonella bacterium that contains amino acids and phosphate and alters the human cell’s cytoskeleton?

Accepted Answer

A protein or peptide

Question 2

Which subatomic particle determines the atomic number of an element?

Accepted Answer

Proton

Question 3

What is the main difference between isotopes of the same element?

Accepted Answer

They have different numbers of neutrons.

Question 4

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the attraction between oppositely charged ions

Question 5

Which equation correctly represents the dissociation of hydrochloric acid in water?

Accepted Answer

$$\mathrm{HCl} \rightarrow \mathrm{H}^+ + \mathrm{Cl}^-$$

Question 6

Which property of water is most important for its role as a temperature buffer in living systems?

Accepted Answer

Its high heat capacity due to hydrogen bonding

Question 7

A solution has a pH of 3. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of H$$^+$$ ions.

Question 8

Which of the following is a correct definition of a mole?

Accepted Answer

The amount of substance containing Avogadro’s number ($$6.02 	imes 10$$^{23}$$) of particles

Question 9

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined and water is released

Question 10

Which functional groups are present in all amino acids?

Accepted Answer

Amino group and carboxyl group

Question 11

Which of the following is a polysaccharide?

Accepted Answer

Starch

Question 12

Which of the following statements best distinguishes simple lipids from complex lipids?

Accepted Answer

Simple lipids contain only C, H, and O, while complex lipids also contain elements like P, N, or S.

Question 13

Which level of protein structure is characterized by the folding of the polypeptide chain into alpha helices and beta sheets?

Accepted Answer

Secondary structure

Question 14

Which of the following is a building block of nucleic acids?

Accepted Answer

Nucleotide

Question 15

Which of the following best explains why ATP provides more energy for a cell than ADP?

Accepted Answer

ATP contains more phosphate groups, and breaking the bond between the second and third phosphate releases significant energy.

Question 16

Which of the following is an example of a reversible reaction important in biological systems?

Accepted Answer

$$\mathrm{CO}_2 + \mathrm{H}_2\mathrm{O} \rightleftharpoons \mathrm{H}_2\mathrm{CO}_3$$

Question 17

Which of the following best describes the role of phospholipids in cell membranes?

Accepted Answer

They form a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward.

Question 18

Which of the following is a correct pairing of a DNA base with its complementary base?

Accepted Answer

Cytosine with guanine

Question 19

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to O or N and another O or N atom

Question 20

Which of the following is an example of an exergonic reaction?

Accepted Answer

The breakdown of ATP to ADP and inorganic phosphate, releasing energy

Fundamental Chemical Principles: Atoms, Bonds, and Biological Molecules

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