Question 1

Which of the following best describes the difference between kinetic energy and potential energy in biological systems?

Accepted Answer

Kinetic energy is the energy of movement, such as molecules diffusing across a membrane, while potential energy is stored energy, such as in the chemical bonds of ATP.

Question 2

A cell is placed in a solution and begins to swell. Which term best describes the solution relative to the cell?

Accepted Answer

Hypotonic

Question 3

Which of the following is an example of an exergonic reaction in the human body?

Accepted Answer

Hydrolysis of ATP to ADP and phosphate

Question 4

Which equation correctly represents Fick's law of diffusion?

Accepted Answer

$$J = D \frac{(C_1$ - C_2$)}{d}$$

Question 5

Which of the following would most likely increase the rate of an enzymatic reaction?

Accepted Answer

Increasing substrate concentration up to saturation

Question 6

A patient is given intravenous fluids that are isotonic to their blood plasma. What effect will this have on their red blood cells?

Accepted Answer

The red blood cells will remain unchanged in size.

Question 7

Which of the following best describes the process of secondary active transport?

Accepted Answer

It relies on the energy stored in an electrochemical gradient created by primary active transport.

Question 8

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration.

Question 9

Which of the following is NOT a property that typically increases cell membrane permeability?

Accepted Answer

Large, charged molecules without transport proteins

Question 10

Which of the following best describes feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway inhibits an enzyme involved early in the pathway.

Question 11

Which of the following is a correct comparison between channel proteins and carrier proteins?

Accepted Answer

Channel proteins allow rapid movement of ions, while carrier proteins transport molecules more slowly due to conformational changes.

Question 12

Which of the following best explains the role of the Na$$^+-K$^+$$ ATPase in maintaining cellular homeostasis?

Accepted Answer

It pumps Na$$^+$$ out of the cell and K$$^+$$ into the cell against their concentration gradients using ATP.

Question 13

Which of the following is true regarding bulk flow in biological systems?

Accepted Answer

Bulk flow is driven by pressure gradients and moves large volumes of fluid, such as blood in vessels.

Question 14

Which of the following is a correct statement about the activation energy of a reaction?

Accepted Answer

Activation energy is the minimum energy required to initiate a chemical reaction.

Question 15

A protein lacks a signal/targeting sequence. What is the most likely consequence?

Accepted Answer

It will be degraded in the cytosol or mislocalized within the cell.

Question 16

Which of the following best describes the difference between facilitated diffusion and active transport?

Accepted Answer

Facilitated diffusion moves molecules down their concentration gradient without energy input, while active transport moves molecules against their gradient using ATP.

Question 17

Which of the following is a correct definition of a concentration gradient?

Accepted Answer

A concentration gradient is the difference in the amount of a substance between two regions.

Question 18

Which of the following statements about endocytosis and exocytosis is correct?

Accepted Answer

Endocytosis brings substances into the cell, while exocytosis expels substances from the cell; both are active processes requiring energy.

Question 19

Which of the following best describes an electrochemical gradient?

Accepted Answer

It is the difference in electrical charge and chemical concentration across a membrane.

Question 20

Which of the following is a correct statement about vitamins?

Accepted Answer

Vitamins are organic molecules that often serve as coenzymes in metabolic reactions.

Energy, Cellular Metabolism, and Membrane Dynamics: Study Guide Notes

Study Guide - Practice Questions

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