Q: A solution has a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

$$[H^+] = 1 \times 10$$^{-3}$$ \, \text{mol/L}$$

Question 1

Which of the following best describes the role of a receptor in a homeostatic control system?

Accepted Answer

It detects changes in the environment and sends information to the control center.

Question 2

A patient is experiencing a rapid drop in blood pressure. Which feedback mechanism is most likely to be activated, and what is the expected outcome?

Accepted Answer

Negative feedback; blood vessels constrict to increase blood pressure back to normal.

Question 3

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

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions.

Question 4

Which of the following factors would most likely increase the rate of a chemical reaction catalyzed by an enzyme?

Accepted Answer

Increasing the concentration of substrate.

Question 5

A solution has a pH of 3. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-3}$$ \, 	ext{mol/L}$$

Question 6

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its phosphate bonds and releases it when converted to ADP.

Question 7

Which of the following is a correct statement about electrolytes?

Accepted Answer

Electrolytes are substances that dissociate into ions in water and can conduct electricity.

Question 8

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

Accepted Answer

The cells will lose water and shrink (crenate).

Question 9

Which of the following best describes the function of the Na$$^+/K$^+$$ pump in maintaining membrane potential?

Accepted Answer

It moves 3 Na$$^+$$ ions out of the cell and 2 K$$^+$$ ions into the cell, using ATP.

Question 10

Which of the following is a monosaccharide?

Accepted Answer

Glucose

Question 11

Which of the following best describes the role of enzymes in biochemical reactions?

Accepted Answer

They lower the activation energy required for the reaction to proceed.

Question 12

A cell is placed in a solution and swells until it bursts. Which type of solution was the cell placed in?

Accepted Answer

Hypotonic solution

Question 13

Which of the following is NOT a function of lipids in the body?

Accepted Answer

Serving as genetic information carriers

Question 14

Which transport mechanism requires energy in the form of ATP?

Accepted Answer

Primary active transport

Question 15

Which of the following best explains why water is essential for homeostasis in the human body?

Accepted Answer

Water acts as a solvent, allowing molecules to be transported and chemical reactions to occur.

Question 16

Which of the following best describes facilitated diffusion across the cell membrane?

Accepted Answer

Movement of molecules down their concentration gradient via a carrier protein, without energy input.

Question 17

A solution is described as a colloid. Which of the following best characterizes a colloid?

Accepted Answer

Particles are not evenly distributed but do not settle out.

Question 18

Which of the following is a correct pairing of a macromolecule and its function?

Accepted Answer

Nucleic acids – store genetic information

Question 19

If a cell is placed in an isotonic solution, what will happen to the cell?

Accepted Answer

There will be no net movement of water; the cell remains unchanged.

Question 20

Which of the following best explains why enzymes are not considered reactants in a chemical reaction?

Accepted Answer

Enzymes are not changed or consumed during the reaction.

Anatomy & Physiology: Homeostasis, Biochemistry, and Cell Membrane Transport Study Notes

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