Question 1

Which of the following statements best describes an element as defined in biochemistry?

Accepted Answer

An element is a substance that cannot be changed into a different element or destroyed via chemical reactions.

Question 2

A molecule of water ($H_2O$) is classified as which of the following?

Accepted Answer

A compound, because it is an assembly of two or more different elements.

Question 3

Which of the following best explains why carbon is found in all biomolecules?

Accepted Answer

Carbon atoms can form four covalent bonds, allowing for complex and stable molecular structures.

Question 4

Which of the following is a correct description of a nonpolar molecule?

Accepted Answer

A molecule with no charged poles and hydrophobic properties.

Question 5

Which of the following is the correct formula for calculating the number of electrons in the second shell of an atom?

Accepted Answer

$2n^2$ where $n$ is the shell number; for the second shell, $2 	imes 2^2 = 8$ electrons.

Question 6

A buffer solution is important in biological systems because it:

Accepted Answer

Stabilizes pH by accepting or releasing $H^+$ ions.

Question 7

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

Accepted Answer

Energy storage and quick energy source.

Question 8

Which type of chemical bond involves the sharing of one pair of electrons between two atoms?

Accepted Answer

Single covalent bond

Question 9

A triglyceride molecule is composed of:

Accepted Answer

One glycerol molecule and three fatty acids.

Question 10

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

Accepted Answer

Saturated fatty acids have no double bonds; unsaturated fatty acids contain one or more double bonds.

Question 11

Which of the following is a correct example of a disaccharide?

Accepted Answer

Sucrose

Question 12

Which structural level of a protein is defined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 13

Which of the following is true about phospholipids?

Accepted Answer

They have a hydrophilic head and a hydrophobic tail, making them amphipathic.

Question 14

Which of the following best describes the role of nucleic acids in cells?

Accepted Answer

They store genetic information and direct protein synthesis.

Question 15

Which of the following is a correct pairing of a purine and a pyrimidine found in DNA?

Accepted Answer

Adenine and Thymine

Question 16

Which of the following statements about water is correct?

Accepted Answer

Water is a universal solvent due to its polarity and ability to dissolve ions and polar molecules.

Question 17

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

Enzymes catalyze biochemical reactions, increasing reaction rates.

Question 18

A solution with a pH of 7 is considered:

Accepted Answer

Neutral

Question 19

Which of the following is a property of an atom's nucleus?

Accepted Answer

It contains protons and neutrons.

Question 20

Which of the following is true about ionic bonds?

Accepted Answer

Ionic bonds result in atoms attracting due to opposite charges.

Basic Biochemistry for Anatomy & Physiology

Study Guide - Practice Questions