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

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

Question 1

Which of the following best describes a negative feedback loop in human physiology?

Accepted Answer

A process where the output reduces the original stimulus, maintaining homeostasis.

Question 2

A patient is given an intravenous solution that is hypertonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

The cells will shrink as water leaves the cells to the surrounding solution.

Question 3

Which equation correctly represents the rate of diffusion according to Fick's Law?

Accepted Answer

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

Question 4

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

Accepted Answer

Storing genetic information.

Question 5

A scientist observes that a cell is actively transporting sodium ions out of the cell against their concentration gradient. Which equation best represents the energy requirement for this process?

Accepted Answer

$$\Delta G = RT \ln \left( \frac{[Na^+]_{out}}{[Na^+]_{in}} \right) + zF\Delta \Psi$$

Question 6

Which anatomical term describes movement away from the midline of the body?

Accepted Answer

Abduction

Question 7

Which of the following best distinguishes cancer cells from normal cells?

Accepted Answer

Cancer cells exhibit uncontrolled growth and can invade surrounding tissues.

Question 8

Which organelle is primarily responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 9

Which of the following is a correct description of the difference between DNA and RNA?

Accepted Answer

DNA is double-stranded, while RNA is typically single-stranded.

Question 10

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}$$ 	ext{ M}$$

Question 11

Which of the following best describes the process of osmosis?

Accepted Answer

Movement of water molecules across a semipermeable membrane from low to high solute concentration.

Question 12

Which type of protein structure is primarily stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 13

Which of the following is a catabolic reaction?

Accepted Answer

Breakdown of glucose to produce ATP.

Question 14

Which of the following best describes the function of cell junctions in tissues?

Accepted Answer

They facilitate communication and adhesion between adjacent cells.

Question 15

Which of the following is a correct example of respiratory compensation for metabolic acidosis?

Accepted Answer

Increased respiratory rate to expel CO$$_2$$ and reduce acidity.

Question 16

Which of the following is a triglyceride composed of?

Accepted Answer

Three fatty acids and one glycerol molecule.

Question 17

Which of the following best describes the difference between anabolic and catabolic pathways?

Accepted Answer

Anabolic pathways build complex molecules from simpler ones, while catabolic pathways break down molecules to release energy.

Question 18

Which of the following is a correct description of the scientific method?

Accepted Answer

Formulate a hypothesis, collect data, analyze results, and draw conclusions.

Question 19

Which of the following is a correct example of active transport?

Accepted Answer

Sodium-potassium pump moving Na$$^+$$ out and K$$^+$$ into the cell using ATP.

Question 20

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

Accepted Answer

Enzymes decrease the activation energy, speeding up reactions.

Foundational Concepts in Anatomy & Physiology: Organization, Chemistry, and Cellular Structure

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