Question 1

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are unequally shared, resulting in partial charges on atoms.

Question 2

Water is considered a universal solvent because:

Accepted Answer

Its polarity allows it to dissolve many ionic and polar substances.

Question 3

Which property of water allows it to move upward through plant vessels against gravity?

Accepted Answer

Cohesion and adhesion (capillary action)

Question 4

A solution with a pH of 4 has how many times more hydrogen ions than a solution with a pH of 7?

Accepted Answer

$$1000$$

Question 5

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

Accepted Answer

Carbohydrate – Monosaccharide

Question 6

What type of reaction links two monosaccharides together to form a disaccharide?

Accepted Answer

Dehydration synthesis

Question 7

Which of the following statements about phospholipids is TRUE?

Accepted Answer

They are the main component of cell membranes.

Question 8

Which vitamin is water-soluble and acts as a coenzyme in energy metabolism?

Accepted Answer

Vitamin B

Question 9

Which of the following best explains why ice floats on water?

Accepted Answer

Hydrogen bonds in ice keep water molecules farther apart.

Question 10

Which of the following is NOT a function of proteins?

Accepted Answer

Storing genetic information

Question 11

Which bond type is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 12

Which of the following best describes the role of cholesterol in cell membranes?

Accepted Answer

It helps maintain membrane fluidity.

Question 13

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

Accepted Answer

Adenine – Thymine

Question 14

A mutation changes a single amino acid in a protein. Which level(s) of protein structure could be affected?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 15

Which of the following best describes the process of denaturation in proteins?

Accepted Answer

Loss of secondary, tertiary, or quaternary structure due to environmental changes

Question 16

Which of the following vitamins is fat-soluble and important for calcium absorption?

Accepted Answer

Vitamin D

Question 17

Which of the following is a function of nucleic acids?

Accepted Answer

Storing and transmitting genetic information

Question 18

Which of the following best explains why water has a high specific heat?

Accepted Answer

Hydrogen bonds absorb heat when they break and release heat when they form.

Question 19

Which of the following is true about dehydration synthesis?

Accepted Answer

It forms polymers from monomers by removing water.

Question 20

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

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Chemical Components of Life and Macromolecules: Cell Biology Study Guide

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