Question 1

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons from a metal to a nonmetal, while a covalent bond involves the sharing of electrons between atoms.

Question 2

A patient is found to have a blood pH of 7.1. Which of the following best describes the role of buffers in this scenario?

Accepted Answer

Buffers will absorb $$ \mathrm{H}^+ $$ ions to help increase the pH toward normal.

Question 3

Which of the following molecules is amphiphilic and forms the main component of cell membranes?

Accepted Answer

Phospholipids

Question 4

Which of the following is a correct example of a dehydration synthesis reaction in the human body?

Accepted Answer

Linking amino acids together to form a polypeptide chain

Question 5

A solution contains a high concentration of $$ \mathrm{Na^+} $$ and $$ \mathrm{Cl^-} $$ ions. Which term best describes this solution?

Accepted Answer

Electrolyte solution

Question 6

Which of the following statements about protein structure is correct?

Accepted Answer

The secondary structure involves folding of the polypeptide chain into alpha helices and beta sheets stabilized by hydrogen bonds.

Question 7

Which of the following best explains why nonpolar molecules do not dissolve in water?

Accepted Answer

Nonpolar molecules cannot form hydrogen bonds with water molecules.

Question 8

A genetic disorder results in the substitution of a single amino acid in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 9

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

Accepted Answer

Providing fuel for energy production

Question 10

Which of the following best describes the structure of a nucleotide found in DNA?

Accepted Answer

A phosphate group, a deoxyribose sugar, and a nitrogenous base (A, T, C, or G)

Question 11

Which of the following best explains why ATP is considered the main energy currency of the cell?

Accepted Answer

ATP contains three phosphate groups, and the hydrolysis of the terminal phosphate releases energy for cellular processes: $$ \mathrm{ATP} + \mathrm{H_2O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy} $$

Question 12

A patient is diagnosed with a deficiency in the enzyme that synthesizes phospholipids. Which cellular structure would be most directly affected?

Accepted Answer

Cell membrane

Question 13

Which of the following statements about steroids is correct?

Accepted Answer

Steroids have a backbone of four fused carbon rings known as the steroid nucleus.

Question 14

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are large molecules made up of repeating monomer units.

Question 15

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Carbohydrate – Monosaccharide

Question 16

A researcher is studying the effect of a mutation that prevents the formation of hydrogen bonds in a protein. Which level(s) of protein structure would be most directly affected?

Accepted Answer

Secondary and tertiary structure

Question 17

Which of the following best explains why water is an effective solvent for many biological molecules?

Accepted Answer

Water is a polar molecule that can form hydrogen bonds with other polar or charged molecules.

Question 18

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 19

A person consumes a meal high in saturated fats. Which of the following statements about saturated fatty acids is correct?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms and are typically solid at room temperature.

Question 20

Which of the following best describes the role of glycogen in the human body?

Accepted Answer

Glycogen is a polymer of glucose that serves as a storage form of energy in muscle and liver cells.

Molecular Physiology Overview: Chemical Foundations of Human Physiology

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