Question 1

Which of the following statements best explains why carbon is the backbone of biological macromolecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable structures such as chains, rings, and branches.

Question 2

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

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 3

Which type of isomerism is illustrated by glucose and galactose?

Accepted Answer

Stereoisomerism

Question 4

A dehydration reaction is essential for which of the following biological processes?

Accepted Answer

Formation of a peptide bond between two amino acids

Question 5

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch is composed of $$\alpha-$$glucose monomers, while cellulose is composed of $$\beta-$$glucose monomers.

Question 6

Which of the following is a correct pairing of a nucleotide base found only in RNA and its complementary base?

Accepted Answer

Uracil pairs with Adenine

Question 7

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

Accepted Answer

Animals lack enzymes that can hydrolyze $$\beta-1$$,4 glycosidic linkages found in cellulose.

Question 8

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a hydrophilic head and two hydrophobic tails, allowing them to form bilayers in aqueous environments.

Question 9

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

Accepted Answer

The linear sequence of amino acids joined by peptide bonds

Question 10

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

Accepted Answer

Egg white turning solid when cooked due to heat disrupting hydrogen bonds

Question 11

Which of the following best explains why glycogen is more suitable for energy storage in animals compared to amylose?

Accepted Answer

Glycogen is highly branched, allowing for rapid release of glucose when energy is needed.

Question 12

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

Accepted Answer

A covalent bond linking the 3' hydroxyl group of one nucleotide to the 5' phosphate group of the next nucleotide in nucleic acids

Question 13

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 14

Which of the following is a function of the carbohydrate chitin in nature?

Accepted Answer

It forms the exoskeleton of arthropods and the cell walls of fungi.

Question 15

Which of the following best explains why enantiomers (optical isomers) can have different biological activities?

Accepted Answer

Their three-dimensional arrangement allows them to interact differently with other chiral molecules, such as enzymes or receptors.

Question 16

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA consists of two antiparallel strands held together by hydrogen bonds between complementary bases.

Question 17

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP acts as the primary energy currency, providing energy for cellular processes through hydrolysis of its phosphate bonds.

Question 18

Which of the following is a real-life application of hydrolysis in the human body?

Accepted Answer

Digestion of starch into glucose monomers by enzymes in the small intestine

Question 19

Which of the following best explains why proteins can have such diverse functions in cells?

Accepted Answer

The sequence and chemical properties of 20 different amino acids allow for a vast array of three-dimensional structures and functions.

Macromolecules: Structure, Function, and Biological Importance

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