Q: Which of the following equations correctly represents the hydrolysis of ATP?

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

Q: A solution has a pH of 4. What is the hydrogen ion concentration $$[\mathrm{H}^+] of $$this solution?

$$1 \times 10$$^{-4}$$\ \mathrm{M}$$

Question 1

Which of the following best describes the difference between negative and positive feedback loops in homeostasis?

Accepted Answer

Negative feedback loops counteract changes to maintain stability, while positive feedback loops amplify changes to drive processes to completion.

Question 2

A patient is experiencing dehydration. Which property of water is most important in helping the body maintain temperature homeostasis during this state?

Accepted Answer

Water's high heat capacity

Question 3

Which of the following is a correct example of a negative feedback loop in the human body?

Accepted Answer

Regulation of blood glucose by insulin

Question 4

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms

Question 5

Given the following scenario: A person eats a meal high in carbohydrates, causing blood glucose levels to rise. Which organ detects this change and what is the immediate response?

Accepted Answer

The pancreas detects the change and releases insulin.

Question 6

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 7

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds occur between polar molecules, such as between water molecules.

Question 8

A solution has a pH of 4. What is the hydrogen ion concentration $$[\mathrm{H}^+] of $$this solution?

Accepted Answer

$$1 	imes 10$$^{-4}$$\ \mathrm{M}$$

Question 9

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

Accepted Answer

Water is polar, so its partial charges surround and separate ions.

Question 10

Which of the following best describes the difference between hydrolysis and dehydration synthesis?

Accepted Answer

Hydrolysis breaks a molecule by adding water, while dehydration synthesis joins two molecules by removing water.

Question 11

Which of the following is a correct sequence of protein structure from primary to quaternary?

Accepted Answer

Amino acid sequence → alpha helices and beta sheets → 3D folding → multiple polypeptide chains

Question 12

Which of the following best explains why enzymes lower the activation energy of chemical reactions?

Accepted Answer

Enzymes provide a surface for reactants to come together and stabilize the transition state.

Question 13

Which of the following is NOT a component of an ATP molecule?

Accepted Answer

Deoxyribose sugar

Question 14

A patient has a blood pH of 7.1. Which of the following best describes this condition?

Accepted Answer

The patient is experiencing acidosis.

Question 15

Which of the following best describes the role of buffers in human blood?

Accepted Answer

Buffers maintain pH by neutralizing excess acids or bases.

Question 16

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

Accepted Answer

Triglycerides are composed of three fatty acids attached to a glycerol backbone.

Question 17

Which of the following best explains why cellulose cannot be digested by humans?

Accepted Answer

Humans lack the enzyme to break the beta-1,4 glycosidic bonds in cellulose.

Question 18

Which of the following best describes the relationship between atoms, elements, and molecules?

Accepted Answer

Atoms are the basic units of elements, and molecules are formed when atoms bond together.

Question 19

Which of the following is a correct statement about the importance of ATP in cellular processes?

Accepted Answer

ATP releases energy when the terminal phosphate bond is broken.

Question 20

Which of the following best explains why phospholipids are important in cell membranes?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions, allowing them to form bilayers.

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