Question 1

Which property of carbon most directly contributes to its ability to form large, complex, and diverse molecules essential for life?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms

Question 2

Which of the following is NOT considered a macromolecule in biological systems?

Accepted Answer

Lipids

Question 3

A hydrocarbon molecule with the formula $$C_5H_{12} is $$classified as which type of organic molecule?

Accepted Answer

A saturated hydrocarbon (alkane)

Question 4

Which functional group is responsible for the acidic properties of amino acids and fatty acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

Which type of isomerism is illustrated when glucose and fructose have the same molecular formula ($$C_6H_{12}O_6$) but different structural arrangements?

Accepted Answer

Structural isomerism

Question 6

Which polysaccharide is the primary structural component of plant cell walls and is indigestible by most animals due to its $$\beta$$ glycosidic linkages?

Accepted Answer

Cellulose

Question 7

A patient is diagnosed with sickle-cell disease. Which change at the molecular level is responsible for this condition?

Accepted Answer

A substitution of a single amino acid in the primary structure of hemoglobin

Question 8

Which of the following best explains why lipids are hydrophobic?

Accepted Answer

They consist mostly of hydrocarbons, which form nonpolar covalent bonds

Question 9

Which molecule is the major energy currency of the cell, storing potential energy in its phosphate bonds?

Accepted Answer

Adenosine triphosphate (ATP)

Question 10

Which of the following statements about protein structure is correct?

Accepted Answer

The primary structure is the unique sequence of amino acids

Question 11

A protein loses its biological activity after being exposed to high heat. What is the most likely explanation for this observation?

Accepted Answer

The protein has undergone denaturation, losing its native structure

Question 12

Which of the following is a difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose

Question 13

Which nitrogenous base is found only in RNA and not in DNA?

Accepted Answer

Uracil

Question 14

Which of the following best describes the antiparallel arrangement of DNA?

Accepted Answer

The two strands run in opposite directions: one 5' to 3', the other 3' to 5'

Question 15

Which process describes the breakdown of polymers into monomers by the addition of water?

Accepted Answer

Hydrolysis

Question 16

Which of the following is a storage polysaccharide found in animals?

Accepted Answer

Glycogen

Question 17

Which functional group is commonly found in ATP and is critical for energy transfer in cells?

Accepted Answer

Phosphate group ($$-PO_4$^{2-})$$

Question 18

Which of the following best explains why enzymes that digest starch cannot digest cellulose?

Accepted Answer

Cellulose contains $$\beta$$ glycosidic linkages, which enzymes cannot hydrolyze

Question 19

Which of the following is a correct pairing of a nitrogenous base family and its members?

Accepted Answer

Purines: adenine and guanine

Question 20

A scientist is comparing the DNA sequences of two species to determine their evolutionary relationship. Which field of study does this research best represent?

Accepted Answer

Genomics

Carbon and the Molecular Diversity of Life: Study Notes

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