Question 1

Which of the following correctly describes the difference between a hexose and a pentose sugar?

Accepted Answer

A hexose has 6 carbons, while a pentose has 5 carbons.

Question 2

Which of the following is a pentose sugar found in nucleic acids?

Accepted Answer

Ribose

Question 3

During the formation of a glycosidic bond between two monosaccharides, what type of reaction occurs?

Accepted Answer

Condensation (dehydration synthesis)

Question 4

Which of the following best describes a peptide bond?

Accepted Answer

A bond between the amino group of one amino acid and the carboxyl group of another

Question 5

What is the main type of bond that links nucleotides together in a nucleic acid strand?

Accepted Answer

Phosphodiester bond

Question 6

Which of the following statements about fatty acids is correct?

Accepted Answer

Fatty acids are not covalently bonded to each other, but interact via London dispersion forces and van der Waals interactions.

Question 7

A scientist is analyzing a molecule and finds it contains a six-membered ring with the formula $$C_6H_{12}O_6$. Which molecule is it most likely to be?

Accepted Answer

Glucose

Question 8

Which of the following best explains why trans fatty acids are considered less healthy than cis fatty acids?

Accepted Answer

Trans fatty acids are more likely to be solid at room temperature due to their straight structure, which can lead to plaque buildup in arteries.

Question 9

Which of the following reactions results in the formation of water as a byproduct?

Accepted Answer

Condensation reaction forming a glycosidic bond

Question 10

A mutation causes a ribose sugar in DNA to be replaced with deoxyribose. What is the most likely effect on the molecule?

Accepted Answer

The molecule will become more stable, as deoxyribose lacks a hydroxyl group at the 2' position.

Question 11

Which of the following best describes a condensation reaction?

Accepted Answer

A reaction that joins two molecules together with the loss of a water molecule

Question 12

Which of the following is NOT a correct pairing of biomolecule and its characteristic bond?

Accepted Answer

Fatty acids – Peptide bond

Question 13

A researcher is synthesizing a new disaccharide. Which of the following must occur for the two monosaccharides to be joined?

Accepted Answer

A glycosidic bond must form via a condensation reaction, releasing water.

Question 14

Which of the following best explains why London dispersion forces are important in the structure of lipid bilayers?

Accepted Answer

They allow for flexible, non-covalent interactions between hydrophobic tails, stabilizing the membrane.

Question 15

Which of the following is a correct description of a phosphodiester bond?

Accepted Answer

A bond between the phosphate group of one nucleotide and the hydroxyl group of another nucleotide's sugar

Question 16

If a DNA strand is hydrolyzed, which type of bond is broken to release individual nucleotides?

Accepted Answer

Phosphodiester bonds

Question 17

Which of the following best describes the relationship between glucose and fructose?

Accepted Answer

They are structural isomers, both being hexose sugars.

Question 18

A triglyceride is formed from which of the following components?

Accepted Answer

Three fatty acids and one glycerol molecule

Question 19

Which of the following best explains why deoxyribose is used in DNA instead of ribose?

Accepted Answer

Deoxyribose increases the stability of DNA by lacking a hydroxyl group at the 2' position, making DNA less susceptible to hydrolysis.

Question 20

Which of the following is a correct statement about the formation of peptide bonds?

Accepted Answer

Peptide bonds form between the carboxyl group of one amino acid and the amino group of another, releasing water.

Key Biological Molecules and Their Bonds

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