Question 1

Which of the following best explains why carbon is essential to organic compounds and life as we know it?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for complex and diverse molecular structures.

Question 2

A patient is diagnosed with metabolic acidosis. Which buffer system in the blood is primarily responsible for maintaining pH homeostasis, and what is the main equation representing this system?

Accepted Answer

The bicarbonate buffer system; $$ \mathrm{CO_2$ + H_2O \leftrightarrow H_2CO_3 \leftrightarrow H^+ + $$HCO_3$$^-} $$

Question 3

Which of the following best distinguishes between saturated and unsaturated fatty acids at room temperature?

Accepted Answer

Saturated fatty acids lack double bonds and are solid at room temperature, while unsaturated fatty acids contain one or more double bonds and are typically liquid.

Question 4

A biochemist is analyzing a sample of an unknown macromolecule. The molecule contains a phosphate group, a pentose sugar, and a nitrogenous base. Which class of biomolecule is this, and what is its primary function?

Accepted Answer

Nucleic acid; storage and transmission of genetic information.

Question 5

Which of the following best describes the process of denaturation in proteins?

Accepted Answer

Loss of secondary, tertiary, or quaternary structure due to disruption of non-covalent interactions, often caused by heat or pH changes.

Question 6

Which of the following is a correct example of dehydration synthesis?

Accepted Answer

Formation of a peptide bond between two amino acids, releasing a molecule of water: $$ \mathrm{Amino\ $$acid_1$$ + Amino\ $$acid_2$$ \rightarrow Dipeptide + H_2O} $$

Question 7

A patient is found to have a genetic mutation that affects the structure of their phospholipids. Which cellular structure is most likely to be compromised as a result?

Accepted Answer

Cell membrane

Question 8

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of biochemical reactions, increasing the reaction rate without being consumed.

Question 9

Which of the following best describes the difference between hydrolysis and dehydration synthesis?

Accepted Answer

Hydrolysis adds water to break bonds, while dehydration synthesis removes water to form bonds.

Question 10

A researcher is studying the structure of a disaccharide. Which of the following best describes the bond formed between two monosaccharides?

Accepted Answer

A glycosidic bond formed by dehydration synthesis.

Question 11

Which of the following is a distinguishing feature of organic compounds compared to inorganic compounds?

Accepted Answer

Organic compounds always contain carbon-hydrogen bonds.

Question 12

A patient is found to have a deficiency in the enzyme hexokinase, which catalyzes the first step of glycolysis. What is the likely consequence for cellular metabolism?

Accepted Answer

Impaired glucose utilization and decreased ATP production.

Question 13

Which of the following best describes the structure of a nucleotide?

Accepted Answer

A phosphate group, a five-carbon sugar, and a nitrogenous base.

Question 14

Which of the following is a physiological role of steroids in the human body?

Accepted Answer

Regulation of metabolism and inflammation as hormones such as cortisol.

Question 15

A diet high in trans-fats is associated with increased risk of cardiovascular disease. Which structural feature distinguishes trans-fats from cis-unsaturated fats?

Accepted Answer

Trans-fats have hydrogen atoms on opposite sides of the double bond, resulting in a straighter chain.

Question 16

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

Accepted Answer

The linear sequence of amino acids joined by peptide bonds.

Question 17

Which of the following is a correct statement about the physiological importance of adenosine triphosphate (ATP)?

Accepted Answer

ATP serves as the primary energy currency of the cell, providing energy for cellular processes.

Question 18

Which of the following best describes the process of hydrolysis in the digestion of carbohydrates?

Accepted Answer

Addition of water to break glycosidic bonds, releasing monosaccharides.

Question 19

A mutation causes a change in the tertiary structure of an enzyme. Which of the following is the most likely effect?

Accepted Answer

Altered active site, potentially reducing or eliminating enzyme activity.

Question 20

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

Accepted Answer

A monosaccharide is a single sugar unit, while a polysaccharide is a polymer composed of many sugar units linked by glycosidic bonds.

Core Concepts in Biochemistry for Anatomy & Physiology

Study Guide - Practice Questions

Study Guide - Flashcards