$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (heat and ATP)}$$

Question 1

Which of the following best describes the general formula for carbohydrates, and what is their primary function in the body?

Accepted Answer

Carbohydrates have a general formula of $$C_nH_{2n}O_n$$ and primarily supply energy to cells.

Question 2

Which of the following is a correct example of a monosaccharide and its biological significance?

Accepted Answer

Glucose; it is the primary fuel molecule oxidized during aerobic cellular respiration.

Question 3

During aerobic cellular respiration, which equation correctly represents the breakdown of glucose?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy (heat and ATP)}$$

Question 4

Which of the following statements about lipids is TRUE?

Accepted Answer

Lipids are nonpolar molecules that are insoluble in water and include triglycerides, phospholipids, and steroids.

Question 5

A patient is found to have a deficiency in phospholipids. Which cellular structure would be most directly affected?

Accepted Answer

Cell membrane integrity and function

Question 6

Which of the following best distinguishes saturated from unsaturated fatty acids?

Accepted Answer

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

Question 7

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information

Question 8

A protein is exposed to a temperature above 40°C. What is the most likely consequence at the molecular level?

Accepted Answer

The protein will denature, losing its three-dimensional structure and function.

Question 9

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

Accepted Answer

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

Question 10

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 11

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

Accepted Answer

Humans lack the enzyme to break the specific glycosidic bonds in cellulose.

Question 12

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Protein – amino acid

Question 13

A person is unable to produce sufficient ATP. Which molecule is most directly involved in this deficiency?

Accepted Answer

Adenosine triphosphate (ATP)

Question 14

Which of the following best describes the role of enzymes in metabolic reactions?

Accepted Answer

Enzymes lower the activation energy required for reactions, increasing the rate of metabolic processes.

Question 15

Which of the following is a correct description of glycogen?

Accepted Answer

A polysaccharide stored in the liver and muscle for energy reserve

Question 16

A patient has a genetic mutation that prevents the formation of peptide bonds. Which biological molecule would be most affected?

Accepted Answer

Proteins

Question 17

Which of the following best explains the importance of the sequence of amino acids in a protein?

Accepted Answer

The sequence determines the protein's three-dimensional structure and function.

Question 18

Which of the following is a function of cholesterol in the human body?

Accepted Answer

It is a component of cell membranes and a precursor for steroid hormones.

Question 19

Which of the following best describes the process of DNA replication?

Accepted Answer

DNA strands separate and each serves as a template for building a complementary strand.

Question 20

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds and releases it when these bonds are broken.

The Chemical Level of Organization: Organic Molecules in Anatomy & Physiology

Study Guide - Practice Questions