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 patient is given a solution containing sodium chloride (NaCl). What property of NaCl allows it to dissolve easily in water?

Accepted Answer

NaCl is an ionic compound, and ionic compounds are hydrophilic, allowing them to dissolve in water.

Question 3

Which of the following molecules is most likely to be hydrophobic?

Accepted Answer

Triglyceride, a lipid composed of three fatty acids and glycerol

Question 4

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

Accepted Answer

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

Question 5

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions, allowing them to form bilayers in aqueous environments.

Question 6

A buffer system in the blood helps maintain pH by which of the following mechanisms?

Accepted Answer

By releasing or binding hydrogen ions ($\mathrm{H^+}$) to minimize changes in pH.

Question 7

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

Accepted Answer

A molecule formed by the union of two monosaccharides via a dehydration synthesis reaction.

Question 8

Which of the following is the correct formula for glucose, a common monosaccharide?

Accepted Answer

$\mathrm{C_6H_{12}O_6}$

Question 9

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 10

A mutation changes the sequence of nucleotides in DNA. Which level of protein structure is directly affected first?

Accepted Answer

Primary structure

Question 11

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

Accepted Answer

Providing fuel for energy production

Question 12

Which of the following is a correct description of ATP?

Accepted Answer

ATP is composed of adenine, ribose, and three phosphate groups, and serves as the main source of chemical energy in cells.

Question 13

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

Accepted Answer

The assembly of multiple polypeptide subunits into a functional protein.

Question 14

Which of the following is a correct pairing of a nitrogenous base in DNA?

Accepted Answer

Guanine pairs with cytosine

Question 15

Which of the following is a characteristic of organic molecules found in the human body?

Accepted Answer

They always contain carbon bonded to hydrogen.

Question 16

A patient has a deficiency in magnesium (Mg). Which of the following is most likely to be affected?

Accepted Answer

Protein synthesis, as magnesium is required for ribosome function.

Question 17

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

Accepted Answer

They do not form hydrogen bonds with water molecules.

Question 18

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

Accepted Answer

A molecule composed of a nitrogenous base, a pentose sugar, and a phosphate group.

Question 19

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

Accepted Answer

$\mathrm{C_{12}H_{22}O_{11}} + \mathrm{H_2O} \rightarrow 2\mathrm{C_6H_{12}O_6}$

Molecular Physiology Foundations: Atoms, Bonds SEPT 5

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