Question 1

Which of the following statements correctly describes the difference between amylose and cellulose?

Accepted Answer

Amylose contains $$\alpha(1 \rightarrow 4)$$ glycosidic bonds, while cellulose contains $$\beta(1 \rightarrow 4)$$ glycosidic bonds.

Question 2

A carbohydrate with the molecular formula $$C_5H_{10}O_5$ and a ketone functional group is best classified as which of the following?

Accepted Answer

Ketopentose

Question 3

Which of the following best explains why only D-enantiomers of monosaccharides are commonly found in nature?

Accepted Answer

Enzymes in biological systems are stereospecific and only recognize D-enantiomers.

Question 4

Which of the following disaccharides is a nonreducing sugar, and why?

Accepted Answer

Sucrose, because its anomeric carbons are involved in the glycosidic bond.

Question 5

Which of the following statements about fatty acids is correct?

Accepted Answer

Naturally occurring unsaturated fatty acids are typically cis isomers.

Question 6

During saponification, which of the following products is formed from the reaction of a triacylglycerol with sodium hydroxide ($$NaOH$$)?

Accepted Answer

Glycerol and sodium salts of fatty acids (soap)

Question 7

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

Accepted Answer

The overall three-dimensional shape stabilized by interactions between R groups.

Question 8

Which of the following statements about denaturation of proteins is correct?

Accepted Answer

Denaturation disrupts secondary, tertiary, and quaternary structures but leaves the primary structure intact.

Question 9

A DNA strand has the sequence 5'-ATG CCG TAA-3'. What is the sequence of the complementary DNA strand?

Accepted Answer

3'-TAC GGC ATT-5'

Question 10

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

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 11

Which of the following best describes a nucleotide?

Accepted Answer

A molecule consisting of a nitrogenous base, a sugar, and a phosphate group.

Question 12

Which of the following statements about cholesterol is correct?

Accepted Answer

Cholesterol contains four fused rings and a hydroxyl group.

Question 13

Which of the following amino acids would be classified as polar acidic?

Accepted Answer

An amino acid with a carboxylic acid group in its R group.

Question 14

Which of the following best describes the process of translation in cells?

Accepted Answer

The synthesis of a protein from an mRNA template.

Question 15

Which of the following is a property of essential fatty acids?

Accepted Answer

They must be obtained from the diet because the body cannot synthesize them.

Question 16

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

Accepted Answer

Humans lack the enzyme to hydrolyze $$\beta(1 \rightarrow 4)$$ glycosidic bonds.

Question 17

Which of the following is true about the peptide bond in proteins?

Accepted Answer

It is an amide bond formed between the carboxyl group of one amino acid and the amino group of another.

Question 18

Which of the following best describes a chiral carbon?

Accepted Answer

A carbon atom bonded to four different groups.

Question 19

Which of the following is a correct description of a reducing sugar?

Accepted Answer

A sugar with a free anomeric carbon capable of acting as a reducing agent.

Question 20

Which of the following is a correct statement about the hydrolysis of sucrose in the human body?

Accepted Answer

Sucrose is hydrolyzed to glucose and fructose by the enzyme sucrase.

Comprehensive Study Notes: Carbohydrates, Lipids, Proteins, and Nucleic Acids

Study Guide - Practice Questions