$$[H^+] = 1 \times 10$$^{-4}$$ M

Question 1

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed more rapidly.

Question 2

Which equation correctly represents Gibbs Free Energy?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 3

Water has a high heat of vaporization. Which property of water is primarily responsible for this?

Accepted Answer

Its extensive hydrogen bonding

Question 4

A solution has a pH of 4. What is the concentration of hydrogen ions ($$[H^+]) in $$the solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ M

Question 5

Which of the following macromolecules is correctly paired with its monomer?

Accepted Answer

Lipid – Fatty acid

Question 6

Which type of chemical bond is found between the monomers of proteins?

Accepted Answer

Peptide bond

Question 7

During cellular respiration, which process directly produces the most ATP?

Accepted Answer

Oxidative phosphorylation (Electron Transport Chain)

Question 8

Which statement best explains why phospholipids form bilayers in water?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, causing them to arrange with heads facing water and tails facing inward.

Question 9

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 10

A cell is placed in a solution with a lower water potential than its cytoplasm. What will happen to the cell?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 11

Which process in photosynthesis is directly responsible for the production of oxygen?

Accepted Answer

Photolysis of water during the light-dependent reactions

Question 12

Which of the following best describes the function of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for cellular processes by transferring a phosphate group.

Question 13

Which of the following statements about passive transport is correct?

Accepted Answer

Passive transport relies on the random movement of molecules down their concentration gradient.

Question 14

Which of the following is a correct sequence of events in the signal transduction pathway involving G-proteins?

Accepted Answer

Ligand binds receptor → G-protein is activated → Second messenger is produced

Question 15

Which of the following hormones is primarily involved in regulating blood glucose levels?

Accepted Answer

Insulin

Question 16

Which of the following statements about apoptosis is correct?

Accepted Answer

Apoptosis involves the activation of caspase proteins.

Question 17

Which of the following is a product of the Calvin Cycle in photosynthesis?

Accepted Answer

Glucose

Question 18

Which of the following statements about the electron transport chain in mitochondria is true?

Accepted Answer

It creates a proton gradient used to synthesize ATP.

Question 19

A mutation causes a protein to lose its tertiary structure but retain its primary structure. Which property is most likely affected?

Accepted Answer

The protein's ability to catalyze reactions

Question 20

Which of the following is a correct description of facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient through a membrane protein

General Biology: Thermodynamics, Biochemistry, Cell Organization, Communication, and Energetics Study Guide

Study Guide - Practice Questions