Question 1

Which of the following best describes the process by which proteins are synthesized from amino acids in cells?

Accepted Answer

Proteins are synthesized by condensation reactions, which remove water to form peptide bonds.

Question 2

A mutation causes the replacement of a hydrophobic amino acid with a hydrophilic one in the interior of a globular protein. What is the most likely effect on the protein's structure?

Accepted Answer

The protein may misfold or become unstable due to disruption of hydrophobic interactions.

Question 3

Which of the following bonds is primarily responsible for stabilizing the secondary structure (α-helix and β-sheet) of proteins?

Accepted Answer

Hydrogen bonds

Question 4

Which of the following statements about the directionality of polypeptides is correct?

Accepted Answer

Polypeptides have an amino group at the N-terminus and a carboxyl group at the C-terminus.

Question 5

Which of the following is a function of storage proteins in living organisms?

Accepted Answer

Serving as reservoirs of amino acids and metal ions for later use

Question 6

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

Accepted Answer

Mammals lack enzymes that can hydrolyze β(1→4) glycosidic bonds in cellulose.

Question 7

Which of the following is TRUE regarding the structure of DNA?

Accepted Answer

DNA is a double-stranded helix with antiparallel and complementary strands.

Question 8

A patient is found to have a hemoglobin protein missing three amino acids from its primary sequence. Which level(s) of protein structure could be affected?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 9

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

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

Question 10

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

Accepted Answer

Protein – amino acid

Question 11

Which of the following is a function of glycolipids in the plasma membrane?

Accepted Answer

Serving as sites of biological recognition on the cell surface

Question 12

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids are amphipathic, containing both hydrophilic and hydrophobic regions.

Question 13

Which of the following best explains why essential fatty acids must be obtained from the diet?

Accepted Answer

Humans cannot synthesize certain unsaturated fatty acids.

Question 14

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

Accepted Answer

A bond formed between the carboxyl group of one amino acid and the amino group of another, releasing water.

Question 15

Which of the following is a real-life example of a protein with quaternary structure?

Accepted Answer

Hemoglobin

Question 16

Which of the following is a function of steroid hormones derived from cholesterol?

Accepted Answer

Regulating ion balance and promoting glucose synthesis

Question 17

Which of the following best describes the role of complementary base pairing in nucleic acids?

Accepted Answer

It ensures accurate DNA replication and RNA transcription.

Question 18

Which of the following is a distinguishing feature of polysaccharides compared to proteins and nucleic acids?

Accepted Answer

Polysaccharides often consist of repeating units of the same monosaccharide, while proteins and nucleic acids have a defined sequence of different monomers.

Question 19

Which of the following is a correct statement about the formation of a glycosidic bond?

Accepted Answer

It is formed by a condensation reaction between two monosaccharides, releasing water.

Question 20

Which of the following is a function of van der Waals interactions in protein structure?

Accepted Answer

They provide weak, transient attractions that help stabilize protein folding when molecules are very close.

The Macromolecules of the Cell: Structure, Function, and Organization

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