Question 1

Which of the following statements best explains why carbon is considered the framework of biological molecules?

Accepted Answer

Carbon atoms can form up to four covalent bonds, allowing for diverse and stable molecular structures.

Question 2

A molecule with the formula $$C_6H_{12}O_6$ is classified as which type of macromolecule, and what is its primary biological function?

Accepted Answer

It is a carbohydrate, and its primary function is energy storage.

Question 3

Which functional group is present in both amino acids and proteins and is responsible for forming peptide bonds?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 4

During the process of dehydration synthesis, which of the following occurs?

Accepted Answer

Water is removed to join monomers into polymers.

Question 5

Which statement correctly describes the difference between structural isomers and stereoisomers?

Accepted Answer

Structural isomers differ in the structure of the carbon skeleton, while stereoisomers differ in how groups are attached.

Question 6

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

Accepted Answer

They help newly made proteins fold correctly, preventing misfolding and related diseases.

Question 7

A scientist is studying a hereditary disorder where a protein has the correct amino acid sequence but fails to fold properly. Which cellular process is most likely impaired?

Accepted Answer

Chaperone-mediated protein folding

Question 8

Which of the following is a correct example of a polysaccharide and its biological role?

Accepted Answer

Glycogen; energy storage in animals

Question 9

Which of the following statements about phospholipids is true?

Accepted Answer

Phospholipids form bilayers with hydrophilic heads facing outward and hydrophobic tails facing inward.

Question 10

Which nitrogenous bases are classified as purines in nucleic acids?

Accepted Answer

Adenine and guanine

Question 11

A protein loses its tertiary structure when exposed to high temperature and extreme pH. What is this process called?

Accepted Answer

Denaturation

Question 12

Which of the following correctly matches a macromolecule with its monomer?

Accepted Answer

Carbohydrate — monosaccharide

Question 13

Which of the following is a real-world application of the concept of free fermentation as described in the study materials?

Accepted Answer

Studying enzyme-catalyzed reactions outside of living cells to understand biochemical pathways.

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 equation represents the general empirical formula for carbohydrates?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 16

Which of the following is a correct pairing of a protein structural level and its description?

Accepted Answer

Tertiary structure — final folded shape of a globular protein

Question 17

Which molecule is the primary energy currency of the cell?

Accepted Answer

ATP

Question 18

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

Accepted Answer

Saturated fats have no double bonds and a higher melting point, while unsaturated fats have one or more double bonds and a lower melting point.

Question 19

Which of the following is a correct example of a functional group and its role in biological molecules?

Accepted Answer

Carboxyl group ($$-COOH$$); found in amino acids and proteins, contributing to acidity and peptide bond formation.

Biological Macromolecules: Structure, Function, and Diversity

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