Question 1

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

Accepted Answer

Hydrophobic molecules repel water and do not dissolve in it, while hydrophilic molecules attract and dissolve in water.

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

Which part of an amino acid varies among different amino acids and determines their unique properties?

Accepted Answer

The R group (side chain)

Question 4

What type of bond forms between the amino group of one amino acid and the carboxyl group of another during protein synthesis?

Accepted Answer

Peptide bond

Question 5

Which of the following is a major difference between starch and cellulose?

Accepted Answer

Starch contains $$\alpha-$$glucose linkages, while cellulose contains $$\beta-$$glucose linkages.

Question 6

Which type of macromolecule is primarily responsible for catalyzing biochemical reactions in cells?

Accepted Answer

Proteins (enzymes)

Question 7

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 8

What type of bond connects monosaccharides to form disaccharides?

Accepted Answer

Glycosidic bond

Question 9

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

Accepted Answer

Fatty acid

Question 10

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

Accepted Answer

Adenine pairs with thymine, cytosine pairs with guanine

Question 11

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

Accepted Answer

Unsaturated fats have one or more double bonds in their fatty acid chains, making them liquid at room temperature.

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

A patient is diagnosed with a genetic disorder caused by a mutation in the tertiary structure of a protein. Which of the following is most likely affected?

Accepted Answer

The folding and interactions between R groups, resulting in the overall 3D shape

Question 14

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

Accepted Answer

Humans lack the enzyme to break $$\beta-$$glycosidic bonds in cellulose.

Question 15

Which of the following is a correct description of a quaternary protein structure?

Accepted Answer

The arrangement and interaction of multiple polypeptide subunits

Question 16

Which of the following is a real-world example of a protein with quaternary structure?

Accepted Answer

Hemoglobin, which consists of four polypeptide subunits

Question 17

Which of the following best describes the difference between a monosaccharide and a polysaccharide?

Accepted Answer

Monosaccharides are simple sugars, while polysaccharides are long chains of monosaccharides linked by glycosidic bonds.

Question 18

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

Accepted Answer

Cytosine ($$C) $$pairs with guanine ($$G)$$

Question 19

Which of the following is a correct description of the bond that links nucleotides together in a DNA strand?

Accepted Answer

Phosphodiester bond

Question 20

A scientist is studying a molecule with the following components: a pentose sugar, a phosphate group, and a nitrogenous base. What type of molecule is this?

Accepted Answer

A nucleotide

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

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