Question 1

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

Accepted Answer

Condensation reactions that remove water to form peptide bonds

Question 2

A mutation causes a single amino acid substitution in the primary structure of a protein. Which level(s) of protein structure could be affected as a result?

Accepted Answer

All levels: primary, secondary, tertiary, and quaternary

Question 3

Which of the following bonds is responsible for stabilizing the secondary structure of proteins such as α helices and β sheets?

Accepted Answer

Hydrogen bonds

Question 4

Which amino acid is most likely to disrupt an α helix due to its inability to form hydrogen bonds?

Accepted Answer

Proline

Question 5

Hemoglobin is an example of a protein with which level of structure?

Accepted Answer

Quaternary structure

Question 6

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA contains deoxyribose and thymine

Question 7

What type of bond links nucleotides together in a nucleic acid polymer?

Accepted Answer

Phosphodiester bond

Question 8

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

Accepted Answer

It is composed of β-d-glucose with β(1→4) linkages

Question 9

Which of the following is a distinguishing feature of unsaturated fatty acids compared to saturated fatty acids?

Accepted Answer

They have one or more double bonds causing bends in the chain

Question 10

A patient has a genetic disorder affecting the formation of disulfide bonds in proteins. Which amino acid is most directly involved in this defect?

Accepted Answer

Cysteine

Question 11

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

They have both hydrophilic and hydrophobic regions

Question 12

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

Accepted Answer

Cell recognition and communication

Question 13

Which of the following correctly matches a polysaccharide with its primary biological function?

Accepted Answer

Starch – energy storage in plants

Question 14

Which of the following statements about the double helix structure of DNA is correct?

Accepted Answer

The strands are antiparallel and held together by hydrogen bonds

Question 15

Which of the following is a real-world consequence of the presence of trans fats in the human diet?

Accepted Answer

Increased risk of heart disease and elevated cholesterol

Question 16

Which of the following best explains why starch and cellulose, both polymers of glucose, have different properties?

Accepted Answer

Starch is branched and forms helices, while cellulose is unbranched and forms rigid rods

Question 17

Which of the following is a function of molecular chaperones in cells?

Accepted Answer

Assisting in the proper folding of proteins

Question 18

Which of the following is a correct statement about the directionality of polypeptides?

Accepted Answer

The N-terminus contains a free amino group and the C-terminus contains a free carboxyl group

Question 19

Which of the following is a true statement about the role of cholesterol in animal cell membranes?

Accepted Answer

It increases membrane rigidity and modulates fluidity

Question 20

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

Accepted Answer

A nucleotide contains a sugar, a phosphate group, and a nitrogenous base

The Macromolecules of the Cell: Study Notes for Cell Biology

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