Question 1

Which of the following statements best explains why water is considered a polar molecule?

Accepted Answer

Because the oxygen end of the molecule has a partial negative charge and the hydrogen end has a partial positive charge.

Question 2

Which macromolecule is primarily responsible for storing genetic information in living organisms?

Accepted Answer

Nucleic acids

Question 3

A dehydration reaction in biological systems results in which of the following?

Accepted Answer

Linking subunits together to form larger molecules by removing water.

Question 4

Which of the following is the correct chemical formula for glucose, a hexose sugar?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 5

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds in their carbon chains, while unsaturated fatty acids have one or more.

Question 6

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

Accepted Answer

Enzymatic catalysis

Question 7

A patient is diagnosed with atherosclerosis. Which dietary component is most likely contributing to this condition?

Accepted Answer

High intake of saturated and trans fats

Question 8

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids have a polar, hydrophilic head and a non-polar, hydrophobic tail.

Question 9

Which of the following is true regarding the structure of DNA and RNA?

Accepted Answer

DNA is double-stranded and contains thymine; RNA is single-stranded and contains uracil.

Question 10

Which of the following is the correct sequence of protein structural organization from simplest to most complex?

Accepted Answer

Primary, secondary, tertiary, quaternary

Question 11

A mutation in the DNA sequence that changes the amino acid sequence of a protein can result in which of the following?

Accepted Answer

A change in protein shape and possible loss of function

Question 12

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

Accepted Answer

Adenine pairs with thymine

Question 13

Which of the following reactions is responsible for breaking down a polysaccharide into monosaccharides?

Accepted Answer

Hydrolysis reaction

Question 14

Which of the following is a real-life example of a protein losing its function due to denaturation?

Accepted Answer

Egg white solidifying when cooked

Question 15

Which of the following is the main storage form of carbohydrates in animals?

Accepted Answer

Glycogen

Question 16

Which of the following best describes the role of ATP in the cell?

Accepted Answer

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

Question 17

Which of the following is a characteristic of hydrophobic molecules?

Accepted Answer

They are non-polar and do not mix with water.

Question 18

Which of the following is a steroid hormone derived from cholesterol?

Accepted Answer

Testosterone

Question 19

A patient with sickle-cell anemia has a mutation in their DNA that causes which amino acid substitution in hemoglobin?

Accepted Answer

Valine replaces glutamine

Question 20

Which of the following best explains why cellulose is indigestible by humans?

Accepted Answer

Humans lack the enzyme to break the specific glycosidic bonds in cellulose.

Chemistry of Life – Study Notes

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