Question 1

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

Accepted Answer

Amylose contains $$\alpha(1 \rightarrow 4)$$ glycosidic bonds only, while amylopectin contains both $$\alpha(1 \rightarrow 4)$$ and $$\alpha(1 \rightarrow 6)$$ glycosidic bonds.

Question 2

Which of the following best describes a chiral carbon atom?

Accepted Answer

A carbon atom bonded to four different atoms or groups.

Question 3

Which of the following disaccharides is a nonreducing sugar?

Accepted Answer

Sucrose

Question 4

A patient is diagnosed with lactose intolerance. Which glycosidic bond is the enzyme lactase unable to hydrolyze?

Accepted Answer

$$\beta(1 \rightarrow 4)$$

Question 5

Which of the following statements about unsaturated fatty acids is TRUE?

Accepted Answer

They can have cis double bonds, which introduce kinks in the hydrocarbon chain.

Question 6

Which process converts a liquid oil into a solid fat by adding hydrogen atoms to double bonds?

Accepted Answer

Hydrogenation

Question 7

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

Accepted Answer

The sequence of amino acids linked by peptide bonds.

Question 8

Which of the following attractive forces is responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonding between backbone atoms.

Question 9

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 10

Which of the following is a component of both DNA and RNA?

Accepted Answer

Phosphoric acid

Question 11

Given the DNA sequence 5'-ATG CCG TAA-3', what is the sequence of the complementary DNA strand?

Accepted Answer

3'-TAC GGC ATT-5'

Question 12

Which of the following best describes the difference between a nucleoside and a nucleotide?

Accepted Answer

A nucleoside contains a nitrogenous base and a sugar; a nucleotide contains a nitrogenous base, a sugar, and a phosphate group.

Question 13

Which of the following mutations is most likely to result in a nonfunctional protein?

Accepted Answer

Nonsense mutation

Question 14

Which of the following statements about cholesterol is TRUE?

Accepted Answer

Cholesterol is a steroid with four fused rings and a hydroxyl group.

Question 15

Which of the following best describes the difference between fats and oils?

Accepted Answer

Fats are solid at room temperature due to a higher proportion of saturated fatty acids, while oils are liquid due to more unsaturated fatty acids.

Question 16

Which of the following is a function of bile salts derived from cholesterol?

Accepted Answer

Emulsification of dietary fats in the small intestine.

Question 17

Which of the following best describes the 3' and 5' ends of a nucleic acid strand?

Accepted Answer

The 3' end has a free hydroxyl group, and the 5' end has a free phosphate group.

Question 18

Which of the following amino acids would be classified as polar acidic based on its R group?

Accepted Answer

Glutamic acid

Question 19

Which of the following best describes the process of saponification?

Accepted Answer

The hydrolysis of triacylglycerols with a strong base to produce glycerol and soap.

Question 20

Which of the following is TRUE regarding the D and L forms of monosaccharides?

Accepted Answer

Only the D form occurs naturally in most biological systems.

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

Guida di studio - Domande di pratica

Study guide - Flashcard