Q: Which of the following is a correct representation of the flow of genetic information in a cell?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best describes the difference between the synthesis and breakdown of polymers in biological systems?

Accepted Answer

Synthesis of polymers occurs by dehydration reactions, while breakdown occurs by hydrolysis.

Question 2

A patient is diagnosed with a genetic disorder that prevents the formation of glycosidic linkages. Which biological molecule would be most directly affected?

Accepted Answer

Carbohydrates

Question 3

Which of the following statements about cellulose and starch is correct?

Accepted Answer

Cellulose is composed of β-glucose monomers, while starch is composed of α-glucose monomers.

Question 4

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing their hydrocarbon chains to pack tightly together.

Question 5

A researcher is studying a molecule with the following structure: a phosphate group, a pentose sugar, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 6

Which of the following is a correct representation of the flow of genetic information in a cell?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 7

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

Accepted Answer

The sequence of amino acids in the polypeptide chain

Question 8

A single amino acid substitution in the hemoglobin protein leads to sickle-cell disease. This is an example of how changes in which level of protein structure can affect function?

Accepted Answer

Primary structure

Question 9

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 10

Which of the following statements about phospholipids is correct?

Accepted Answer

They are the main component of cell membranes, forming a bilayer with hydrophobic tails facing inward.

Question 11

A scientist is analyzing a sample and finds it contains a large amount of chitin. Which organism is the sample most likely from?

Accepted Answer

An arthropod

Question 12

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Humans lack the enzymes to hydrolyze β-1,4-glycosidic linkages in cellulose.

Question 13

Which of the following is a correct pairing of a nitrogenous base in DNA?

Accepted Answer

Adenine with thymine

Question 14

Which of the following best describes the role of hydrogen bonds in the secondary structure of proteins?

Accepted Answer

They form between the amino and carboxyl groups of the polypeptide backbone, stabilizing α-helices and β-sheets.

Question 15

A patient with a high level of trans fats in their diet is at increased risk for which of the following conditions?

Accepted Answer

Cardiovascular disease

Question 16

Which of the following is true about the antiparallel structure of DNA?

Accepted Answer

One DNA strand runs 5' to 3', and the other runs 3' to 5'.

Question 17

Which of the following best describes the process of denaturation?

Accepted Answer

The loss of a protein’s native structure due to changes in pH, temperature, or salt concentration.

Question 18

Which of the following is a real-world application of genomics?

Accepted Answer

Sequencing the entire DNA of a species to study evolutionary relationships

Question 19

Which of the following best explains why fats are a more efficient form of energy storage than carbohydrates?

Accepted Answer

Fats have a higher proportion of energy-rich C-H bonds than carbohydrates.

Question 20

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

Accepted Answer

A bond between the phosphate group of one nucleotide and the sugar of another nucleotide in nucleic acids

The Structure and Function of Large Biological Molecules: Study Guide

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