Question 1

Which of the following best describes the difference between ionic and covalent bonds in biological molecules?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, resulting in charged ions, while covalent bonds involve the sharing of electrons between atoms.

Question 2

A molecule of water ($$H_2O) is an $$example of which type of bond?

Accepted Answer

Polar covalent bond

Question 3

Which element is NOT considered a major element in the human body?

Accepted Answer

Iron (Fe)

Question 4

What is the primary function of carbohydrates in the human body?

Accepted Answer

Providing fuel for energy production

Question 5

Which of the following best explains why nonpolar covalent compounds are hydrophobic?

Accepted Answer

They lack charged or polar regions, so they do not interact favorably with water molecules.

Question 6

Which of the following is a correct representation of the chemical reaction for the formation of sodium chloride ($$NaCl) $$from its elements?

Accepted Answer

$$Na + Cl \rightarrow NaCl$$

Question 7

Which level of protein structure is stabilized primarily by hydrogen bonds between the backbone atoms?

Accepted Answer

Secondary structure

Question 8

A patient is experiencing acidosis. Which buffer system in the blood helps to minimize changes in pH?

Accepted Answer

Bicarbonate buffer system

Question 9

Which of the following is a correct formula for a disaccharide formed from two glucose molecules?

Accepted Answer

$$C_{12}H$$_{22}$$O_{11}$

Question 10

Which of the following statements about phospholipids is TRUE?

Accepted Answer

They have a hydrophilic phosphate head and two hydrophobic fatty acid tails.

Question 11

Which of the following is a function of proteins in the human body?

Accepted Answer

Forming structural components and acting as enzymes

Question 12

Which of the following best describes the structure of DNA?

Accepted Answer

A double helix composed of two long chains of nucleotides

Question 13

Which of the following is a correct description of ATP?

Accepted Answer

ATP is composed of ribose, adenine, and three phosphate groups.

Question 14

Which of the following is a correct example of a polar covalent bond?

Accepted Answer

The bond between oxygen and hydrogen in $$H_2O$$

Question 15

Which of the following best explains the role of electrolytes in the human body?

Accepted Answer

Electrolytes are ions that help conduct electrical signals and maintain fluid balance.

Question 16

Which of the following is TRUE about the hierarchy of structural organization in the human body?

Accepted Answer

The chemical level includes atoms and molecules.

Question 17

A mutation causes a change in the primary structure of a protein. Which level of protein structure is directly affected?

Accepted Answer

Primary structure

Question 18

Which of the following is a correct pairing of a nucleotide base found in RNA?

Accepted Answer

Adenine pairs with Uracil

Question 19

Which of the following is a correct formula for the hydrolysis of ATP?

Accepted Answer

$$ATP + H_2O \rightarrow ADP + P_i + energy$$

Question 20

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

Accepted Answer

A molecule composed of three fatty acids linked to a glycerol backbone

Molecular Physiology Foundations: Atoms, Bonds, and Biomolecules in Human Anatomy & Physiology

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