Question 1

Which property of carbon most directly enables it to form large, complex molecules essential for life?

Accepted Answer

Its four valence electrons allowing for multiple covalent bonds

Question 2

A dehydration reaction is crucial in the synthesis of macromolecules. Which equation best represents the dehydration synthesis of two glucose molecules to form maltose?

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 3

Which of the following statements about saturated and unsaturated fatty acids is correct?

Accepted Answer

Saturated fatty acids are typically found in animal sources and can pack tightly together

Question 4

Which functional group is most likely to act as an acid in biological molecules?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

ATP is considered the energy currency of the cell because:

Accepted Answer

It releases energy when its phosphate groups are hydrolyzed

Question 6

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

Accepted Answer

A pentose sugar, a phosphate group, and a nitrogenous base

Question 7

Which of the following is NOT a function of proteins within cells?

Accepted Answer

Genetic information storage

Question 8

A patient is diagnosed with a disorder that affects the tertiary structure of their proteins. Which type of bond or interaction is most likely disrupted?

Accepted Answer

Disulfide bridges between side chains

Question 9

Which statement about the directionality of DNA polymers is correct?

Accepted Answer

The 5' end has a phosphate group attached to the 5' carbon, and the 3' end has a hydroxyl group attached to the 3' carbon

Question 10

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads interact with water, while hydrophobic tails avoid it

Question 11

Which process is responsible for breaking down polysaccharides into monosaccharides for energy extraction in cells?

Accepted Answer

Hydrolysis

Question 12

A mutation changes the amino acid sequence of a protein. Which level of protein structure is directly affected first?

Accepted Answer

Primary structure

Question 13

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

Accepted Answer

Adenine (A) - Thymine (T)

Question 14

Which of the following environmental changes is most likely to disrupt the weak bonds and interactions within a protein, leading to denaturation?

Accepted Answer

Changing the pH

Question 15

Which of the following is true about enzymes?

Accepted Answer

They speed up chemical reactions without being altered

Question 16

Which of the following is a storage polysaccharide found in plants and consists entirely of glucose monomers?

Accepted Answer

Starch

Question 17

Which of the following statements about RNA is correct?

Accepted Answer

RNA usually exists as a single strand but can have complementary base pairing

Question 18

Which of the following is NOT a component of a nucleotide?

Accepted Answer

Fatty acid

Question 19

Which of the following best describes the role of cholesterol in animal cell membranes?

Accepted Answer

It maintains membrane fluidity

Question 20

Which of the following is a correct description of a hydrolysis reaction?

Accepted Answer

It breaks a polymer into monomers by adding a water molecule

General Biology: Structure and Function of Biological Macromolecules

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