Question 1

Which of the following best describes an isotope?

Accepted Answer

An atom with the same number of protons but a different number of neutrons.

Question 2

Which chemical bond is primarily responsible for the unique properties of water, such as its high boiling point and surface tension?

Accepted Answer

Hydrogen bond

Question 3

A scientist is studying a molecule with the formula $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6. $$Which functional group is most likely present in this molecule if it is a monosaccharide?

Accepted Answer

Hydroxyl group

Question 4

Which of the following statements about dehydration and hydrolysis reactions is correct?

Accepted Answer

Dehydration reactions build polymers by removing water, while hydrolysis reactions break polymers by adding water.

Question 5

Which of the following best explains why carbon can form such a wide variety of covalent bonds?

Accepted Answer

Carbon has four valence electrons, allowing it to form up to four covalent bonds with other atoms.

Question 6

Which of the following is NOT a biologically important polysaccharide?

Accepted Answer

Cholesterol

Question 7

A patient is diagnosed with a disorder affecting the phospholipid bilayer of their cells. Which property of phospholipids is most critical for the formation of the bilayer?

Accepted Answer

Phospholipids are amphipathic, having both hydrophilic and hydrophobic regions.

Question 8

Which of the following best describes the difference between an aldose and a ketose?

Accepted Answer

An aldose contains an aldehyde group, while a ketose contains a ketone group.

Question 9

Which of the following is the correct general formula for a carbohydrate?

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n}\mathrm{O}_n$$

Question 10

Which type of bond is formed between two amino acids during protein synthesis?

Accepted Answer

Peptide bond

Question 11

Which of the following is a function of lipids in biological systems?

Accepted Answer

Energy storage, insulation, and formation of cell membranes

Question 12

Which of the following functional groups is found in both amino acids and proteins?

Accepted Answer

Amino group ($$-\mathrm{NH}_2)$$

Question 13

Which of the following statements about water as a solvent is correct?

Accepted Answer

Water is a polar molecule, allowing it to dissolve many ionic and polar substances.

Question 14

Which of the following is the correct structure for a generic amino acid?

Accepted Answer

$$\mathrm{H}_2\mathrm{N}-\mathrm{CHR}-\mathrm{COOH}$$

Question 15

Which of the following best explains the denaturation of proteins?

Accepted Answer

Denaturation is the loss of a protein's native structure due to changes in temperature, pH, or chemical exposure.

Question 16

Which of the following is a correct statement about the difference between DNA and RNA?

Accepted Answer

DNA contains thymine, while RNA contains uracil.

Question 17

Which of the following is the correct formula for calculating the atomic mass of an element?

Accepted Answer

$$	ext{Atomic mass} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 18

Which of the following is a correct example of a hydrolysis reaction?

Accepted Answer

Breaking a disaccharide into two monosaccharides by adding water

Question 19

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

Accepted Answer

Phospholipids have a hydrophilic head and two hydrophobic tails.

General Biology Exam Study Guide: Chemistry of Life, Macromolecules, and Water

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