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 variety of stable and complex structures.

Question 2

Which process is responsible for joining monomers to form polymers in biological systems, and what is a byproduct of this reaction?

Accepted Answer

Dehydration synthesis; water ($$H_2O) is $$released

Question 3

A protein loses its function after being exposed to high heat. What is the most likely explanation for this loss of function?

Accepted Answer

The protein has been denatured, causing it to lose its three-dimensional shape.

Question 4

Which level of protein structure is directly determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 5

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

Accepted Answer

DNA contains deoxyribose and thymine; RNA contains ribose and uracil.

Question 6

Which of the following is a function of nucleotides other than forming nucleic acids?

Accepted Answer

Acting as energy carriers, such as ATP

Question 7

A mutation changes a single amino acid in the primary structure of a protein. Which of the following outcomes is most likely?

Accepted Answer

The protein's shape and function may be altered due to changes in higher-level structures.

Question 8

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails away from water.

Question 9

Which of the following is a correct pairing of a DNA base with its complementary base?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Question 10

Which of the following best describes the structure of a triglyceride (fat)?

Accepted Answer

One glycerol molecule bonded to three fatty acids

Question 11

Which of the following statements about carbohydrates is correct?

Accepted Answer

Polysaccharides are polymers made from monosaccharide monomers.

Question 12

Which of the following is a real-life consequence of protein denaturation, as discussed in the context of cooking food?

Accepted Answer

Cooking denatures proteins, making them easier to digest by exposing peptide bonds to enzymes.

Question 13

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

Accepted Answer

ATP acts as an energy carrier, providing energy for cellular processes.

Question 14

Which of the following is NOT a function performed by proteins in cells?

Accepted Answer

Storing genetic information

Question 15

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

Accepted Answer

DNA is double-stranded, with complementary base pairing and antiparallel strands.

Question 16

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing their molecules to pack closely together.

Question 17

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

Accepted Answer

A covalent bond formed between the amino group of one amino acid and the carboxyl group of another, releasing water ($$H_2O)$$

Question 18

Which of the following is a function of polysaccharides in living organisms?

Accepted Answer

They can serve as energy storage (e.g., starch, glycogen) or provide structural support (e.g., cellulose).

Question 19

Which of the following best describes the difference between a nucleotide and a nucleic acid?

Accepted Answer

A nucleotide is a monomer; a nucleic acid is a polymer made of nucleotides.

The Four Major Biomolecules: Structure, Function, and Biological Importance

Study Guide - Practice Questions