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

Question 1

Which of the following best explains why water is considered an ideal solvent for biological systems?

Accepted Answer

Water forms hydrogen bonds due to its polarity, allowing it to dissolve ionic and polar substances.

Question 2

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

Accepted Answer

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

Question 3

Which of the following statements about the structure of amino acids is correct?

Accepted Answer

All amino acids have a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a unique R group.

Question 4

Which process is responsible for breaking down macromolecule polymers into their monomers in the digestive system?

Accepted Answer

Hydrolysis reaction

Question 5

A protein is exposed to high heat and extreme pH. What is the most likely outcome?

Accepted Answer

The protein will denature, losing its functional three-dimensional structure.

Question 6

Which of the following best describes the difference between cellulose and starch?

Accepted Answer

Cellulose is a linear polymer providing structural support in plant cell walls, while starch is a branched polymer used for energy storage.

Question 7

Which of the following is a correct representation of the chemical reaction for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O}$$

Question 8

A cell is placed in a hypertonic solution. What will happen to an animal cell in this environment?

Accepted Answer

The cell will shrink as water leaves the cell.

Question 9

Which of the following best explains why carbon is an ideal atomic building block for biological molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for long chains, branches, and rings.

Question 10

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy but do not change the overall $$\Delta G of $$the reaction.

Question 11

A competitive inhibitor affects an enzyme-catalyzed reaction by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 12

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers prevent major changes in pH by accepting or donating protons.

Question 13

Which of the following is a property of phospholipids that is critical for the formation of biological membranes?

Accepted Answer

They are amphipathic, containing both hydrophilic and hydrophobic regions.

Question 14

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus and membrane-bound organelles, while prokaryotic cells do not.

Question 15

Which of the following is a function of the Golgi apparatus in eukaryotic cells?

Accepted Answer

Processing and sorting of membrane and secreted proteins

Question 16

Which of the following best describes the function of the sodium-potassium ATPase in animal cells?

Accepted Answer

It couples ATP hydrolysis to pump sodium out and potassium into the cell, maintaining membrane potential.

Question 17

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is double-stranded and contains deoxyribose, while RNA is single-stranded and contains ribose.

Question 18

Which of the following best describes the role of microtubules during mitosis?

Accepted Answer

They form the mitotic spindle that pulls chromosomes apart.

Question 19

During which phase of the cell cycle is DNA replicated?

Accepted Answer

S phase

Question 20

Which of the following best explains why a reaction with $$\Delta G \u003c 0 is $$considered spontaneous?

Accepted Answer

It releases free energy and can proceed without external energy input.

Fundamental Chemical and Cellular Principles in Biology

Study Guide - Practice Questions