Question 1

Which of the following statements best describes the difference between covalent bonds and hydrogen bonds?

Accepted Answer

Covalent bonds are formed by the sharing of electrons between atoms, while hydrogen bonds are attraction forces between atoms of different molecules.

Question 2

A patient is exposed to high levels of radiation from an unstable isotope. What is the most likely cellular consequence?

Accepted Answer

Increased risk of DNA damage and cancer development.

Question 3

Which of the following best explains why water is considered the 'universal solvent' in biological systems?

Accepted Answer

Water is a polar molecule, allowing it to dissolve a wide variety of solutes.

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 is a function of antioxidants in the human body?

Accepted Answer

They donate electrons to free radicals, stabilizing them and preventing cellular damage.

Question 6

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is two or more atoms bonded together, while a compound is two or more different kinds of atoms bonded together.

Question 7

Which of the following is NOT one of the six most abundant elements in the human body?

Accepted Answer

Sulfur (S)

Question 8

A person consumes a meal high in starch. Which process must occur before the glucose subunits can be absorbed by the intestines?

Accepted Answer

Hydrolysis of polysaccharides into monosaccharides.

Question 9

Which of the following best describes the structure of a phospholipid?

Accepted Answer

A glycerol backbone, two fatty acids, and a phosphate group.

Question 10

Which of the following statements about protein structure is correct?

Accepted Answer

The primary structure is the sequence of amino acids stabilized by peptide bonds.

Question 11

Which of the following is an example of a disaccharide and its component monosaccharides?

Accepted Answer

Sucrose: glucose + fructose

Question 12

Which of the following best explains why unsaturated fatty acids are liquid at room temperature?

Accepted Answer

They have kinks in their tails due to double bonds, preventing close packing.

Question 13

Which of the following is a correct pairing of DNA bases?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Question 14

Which of the following is a function of ATP in the cell?

Accepted Answer

It provides energy for cellular processes by releasing a phosphate group.

Question 15

A scientist is studying a molecule that contains a pentose sugar, a phosphate group, and uracil as a nitrogenous base. This molecule is most likely:

Accepted Answer

A nucleotide of RNA

Question 16

Which process is responsible for joining amino acids together to form a protein, and what is released during this process?

Accepted Answer

Dehydration synthesis; water ($$ \mathrm{H}_2\mathrm{O} ) is $$released.

Question 17

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

Accepted Answer

They act as catalysts, speeding up chemical reactions without being consumed.

Question 18

Which of the following is an example of a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 19

Which of the following statements about essential amino acids is correct?

Accepted Answer

They must be obtained from the diet because the body cannot synthesize them.

Question 20

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

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

The Chemistry of Living Things: Foundations for Human Biology

Study Guide - Practice Questions