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

$$[H^+] = 1 \times 10$$^{-4}$$ \, \text{mol/L}$$

Question 1

Which of the following best describes the organization of the human body from simplest to most complex?

Accepted Answer

Atoms → molecules → cells → tissues → organs → organ systems → organism

Question 2

A patient is experiencing difficulty with muscle contraction due to a lack of ATP. Which organelle is most likely malfunctioning?

Accepted Answer

Mitochondrion

Question 3

Which of the following best explains why enzymes are essential for metabolic reactions in the human body?

Accepted Answer

They lower the activation energy required for reactions to proceed.

Question 4

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

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \, 	ext{mol/L}$$

Question 5

Which of the following is an example of a negative feedback mechanism in the human body?

Accepted Answer

Regulation of blood glucose by insulin

Question 6

Which of the following best describes the function of the plasma membrane?

Accepted Answer

It regulates the movement of substances into and out of the cell.

Question 7

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell?

Accepted Answer

It will swell and may burst due to water influx.

Question 8

Which of the following is a correct statement about passive transport across the plasma membrane?

Accepted Answer

It does not require ATP and moves substances down their concentration gradient.

Question 9

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

Accepted Answer

They minimize changes in pH by accepting or donating hydrogen ions.

Question 10

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

Accepted Answer

Cellular respiration, where glucose is oxidized to produce ATP

Question 11

A scientist is studying the movement of sodium ions across a cell membrane. She observes that sodium moves from an area of low concentration to high concentration. Which process is responsible for this movement?

Accepted Answer

Active transport

Question 12

Which of the following best explains why the directionality of metabolic reactions is important in the human body?

Accepted Answer

It ensures that energy is released or stored as needed for cellular function.

Question 13

Which of the following is a characteristic of living things?

Accepted Answer

They maintain homeostasis.

Question 14

Which of the following best describes the function of endocytosis in a cell?

Accepted Answer

It allows the cell to engulf large particles or liquids from its environment.

Question 15

Which of the following is true regarding the use of ATP in cellular processes?

Accepted Answer

ATP is required for both endocytosis and exocytosis.

Question 16

A patient is unable to maintain a stable internal temperature. Which concept is most directly related to this problem?

Accepted Answer

Homeostasis

Question 17

Which of the following best describes the relationship between pH and $$[H^+] in a $$solution?

Accepted Answer

$$pH = -\log_{10} [H^+]$$

Question 18

Which of the following is NOT a function of proteins found in the plasma membrane?

Accepted Answer

Storing genetic information

Question 19

Which of the following best explains why concentration gradients are important in cellular physiology?

Accepted Answer

They drive the movement of substances across membranes, enabling processes like diffusion and osmosis.

Question 20

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

Accepted Answer

The breakdown of glycogen to glucose

Anatomy & Physiology: Foundational Concepts Study Guide

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