Question 1

Which of the following best explains why carbon is uniquely suited to form the backbone of biological macromolecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for complex branching and ring structures.

Question 2

A dehydration (condensation) reaction is essential in the formation of which of the following biological polymers?

Accepted Answer

Proteins, by joining amino acids with the removal of water.

Question 3

Which functional group is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group $$\mathrm{(-COOH)}$$

Question 4

A patient is diagnosed with a genetic disorder that causes the substitution of a single amino acid in a protein. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 5

Which of the following statements about saturated and unsaturated fats is correct?

Accepted Answer

Saturated fats have no double bonds between carbon atoms and are solid at room temperature.

Question 6

During digestion, the breakdown of starch into glucose monomers involves which type of reaction?

Accepted Answer

Hydrolysis, which adds water to break glycosidic bonds.

Question 7

Which of the following best describes the role of chaperone proteins in cells?

Accepted Answer

They assist in the proper folding of newly synthesized polypeptides.

Question 8

A biologist isolates a molecule with the following components: a five-carbon sugar, a phosphate group, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 9

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

Accepted Answer

Protein – amino acid

Question 10

Cellulose and starch are both polymers of glucose. What structural difference accounts for their different properties?

Accepted Answer

Cellulose has $$\beta-1$$,4 glycosidic linkages, while starch has $$\alpha-1$$,4 glycosidic linkages.

Question 11

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and water is polar, so they do not mix.

Question 12

A protein exposed to high heat loses its three-dimensional structure and function. This process is called:

Accepted Answer

Denaturation

Question 13

Which of the following is a function of nucleic acids in living organisms?

Accepted Answer

Storing and transmitting genetic information

Question 14

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

Question 15

Which of the following bonds is responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between the backbone N-H and C=O groups

Question 16

A triglyceride is formed by the combination of:

Accepted Answer

One glycerol and three fatty acids

Question 17

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

Accepted Answer

The arrangement and interaction of multiple polypeptide subunits

Question 18

Which of the following is a real-life example of a protein losing its function due to denaturation?

Accepted Answer

Egg whites turning solid when cooked due to heat disrupting protein structure

Question 19

Which of the following statements about phospholipids is correct?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, forming the basis of cell membranes.

Question 20

Which of the following best explains why humans cannot digest cellulose, even though it is made of glucose monomers?

Accepted Answer

Humans lack the enzyme to break $$\beta-1$$,4 glycosidic bonds found in cellulose.

Chapter 3: Carbon and the Molecular Diversity of Life – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드