Question 1

Which of the following is NOT a property common to all living things?

Accepted Answer

Ability to photosynthesize

Question 2

Which statement best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons, while ionic bonds involve the transfer of electrons.

Question 3

A water molecule is polar because:

Accepted Answer

Oxygen is more electronegative than hydrogen, creating a partial negative charge near the oxygen atom.

Question 4

Which of the following equations correctly represents the dissociation of water?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 5

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water molecules form hydrogen bonds with ions, surrounding and separating them.

Question 6

Which of the following statements about acids and bases is correct?

Accepted Answer

Bases decrease the concentration of $$H^+$$ ions in solution.

Question 7

Which property of water allows it to moderate Earth's climate?

Accepted Answer

High heat of vaporization

Question 8

Which of the following best describes the structure of a phospholipid bilayer in cell membranes?

Accepted Answer

Hydrophilic heads face outward toward water, and hydrophobic tails face inward away from water.

Question 9

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates.

Question 10

A mutation changes a single amino acid in the active site of an enzyme. What is the most likely effect?

Accepted Answer

The enzyme's ability to bind its substrate may be reduced or lost.

Question 11

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

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

Question 12

Which of the following is a function of proteins in living systems?

Accepted Answer

Catalyzing biochemical reactions

Question 13

Which process is responsible for the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 14

Which of the following best describes the role of ATP in cellular processes?

Accepted Answer

ATP stores and transfers energy for cellular work.

Question 15

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

Water will leave the cell, causing it to shrink.

Question 16

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells contain membrane-bound organelles, while prokaryotic cells do not.

Question 17

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules across a membrane through transport proteins, down their concentration gradient, without energy input.

Question 18

Which of the following best explains the importance of the primary structure of a protein?

Accepted Answer

It determines the final three-dimensional shape and function of the protein.

Question 19

Which of the following is a correct description of the relationship between DNA, RNA, and proteins in eukaryotic cells?

Accepted Answer

DNA is transcribed into RNA, which is then translated into proteins.

Question 20

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

Accepted Answer

Their hydrophilic heads interact with water while their hydrophobic tails avoid water.

General Biology: Fundamental Concepts and Molecular Basis of Life

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