Question 1

Which of the following best describes the difference between hydrophobic and hydrophilic molecules?

Accepted Answer

Hydrophobic molecules do not interact with water because they are nonpolar, while hydrophilic molecules interact with water due to their polarity.

Question 2

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$\mathrm{COOH})$$

Question 3

What makes one amino acid different from another?

Accepted Answer

The side chain (R group) attached to the central carbon.

Question 4

Which part of a water molecule is most important in the formation of hydrogen bonds?

Accepted Answer

The oxygen atom, due to its electronegativity.

Question 5

Which type of bond connects monosaccharides to form polysaccharides?

Accepted Answer

Glycosidic bond

Question 6

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

Providing energy for cellular processes

Question 7

Which type of bond can be broken by animals to release energy from starch or cellulose?

Accepted Answer

Glycosidic bond

Question 8

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

Accepted Answer

Saturated fats have only single bonds between carbon atoms, while unsaturated fats have one or more double bonds.

Question 9

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 10

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

Accepted Answer

Carboxyl group

Question 11

Which of the following correctly describes the base pairing rules in DNA?

Accepted Answer

Adenine pairs with thymine, cytosine pairs with guanine

Question 12

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

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 13

Which of the following best describes a quaternary protein structure?

Accepted Answer

The arrangement of multiple polypeptide chains into a functional protein complex.

Question 14

Which of the following is a major function of lipids in biological systems?

Accepted Answer

Forming the main component of cell membranes

Question 15

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

Accepted Answer

A molecule with two hydrophobic tails and a hydrophilic head

Question 16

Which of the following is a correct statement about the structure of carbohydrates?

Accepted Answer

Polysaccharides are formed by the dehydration synthesis of monosaccharides.

Question 17

Which of the following is a correct example of a macromolecule and its basic function?

Accepted Answer

Carbohydrate: provides energy

Question 18

Which of the following is a correct match between a biomolecule and its monomer?

Accepted Answer

Nucleic acid: nucleotide

Question 19

Which of the following best explains why cellulose cannot be digested by most animals?

Accepted Answer

Cellulose has glycosidic bonds in a beta configuration that most animals lack enzymes to hydrolyze.

Question 20

A patient is diagnosed with a genetic disorder that affects the folding of their hemoglobin protein. Which level of protein structure is most likely disrupted?

Accepted Answer

Tertiary structure

General Biology: Macromolecules, Proteins, and Nucleic Acids Study Guide

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