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

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

Question 1

Which of the following best describes negative feedback in homeostatic control mechanisms?

Accepted Answer

It reverses the original stimulus, helping to restore balance in the body.

Question 2

A patient is experiencing rapid blood loss from a wound. Which homeostatic mechanism is primarily responsible for amplifying the process of blood clotting at the site of injury?

Accepted Answer

Positive feedback

Question 3

Which of the following is NOT considered an essential survival need for humans?

Accepted Answer

High atmospheric humidity

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}$$ \ \mathrm{M}$$

Question 5

Which of the following best explains why water is an effective solvent in biological systems?

Accepted Answer

Water is a polar molecule, allowing it to dissolve ionic and polar substances.

Question 6

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

Accepted Answer

The cell will swell and may burst due to water influx.

Question 7

Which of the following best describes the structure of a phospholipid in the plasma membrane?

Accepted Answer

Polar heads facing both the inside and outside, with nonpolar tails sandwiched in between

Question 8

Which of the following is a correct example of a covalent bond?

Accepted Answer

H$$_2O ($$water) molecule formation

Question 9

A scientist is studying the movement of glucose across a cell membrane down its concentration gradient. Which type of membrane transport is being observed?

Accepted Answer

Facilitated diffusion

Question 10

Which of the following best describes the function of tight junctions between epithelial cells?

Accepted Answer

Prevent leakage of extracellular fluid between cells

Question 11

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Question 12

Which of the following is a function of ATP in the cell?

Accepted Answer

Serves as the main energy currency for cellular processes

Question 13

A cell is placed in a solution and does not change in size. What can you conclude about the tonicity of the solution?

Accepted Answer

The solution is isotonic to the cell.

Question 14

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

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

Question 15

Which of the following is a property of water that is critical for temperature regulation in the human body?

Accepted Answer

High heat of vaporization

Question 16

Which of the following best describes the role of the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase) in active transport?

Accepted Answer

It uses ATP to move sodium out of the cell and potassium into the cell against their gradients.

Question 17

Which of the following is a correct match between an organic compound and its function?

Accepted Answer

Carbohydrates – main energy source

Question 18

A solution is made by dissolving salt in water. Which term best describes this mixture?

Accepted Answer

Solution

Question 19

Which of the following best explains why proteins can have such diverse functions in the body?

Accepted Answer

Proteins have complex structures with up to four levels of organization.

Question 20

A patient is given intravenous fluids that are isotonic to their blood plasma. What is the expected effect on the patient's red blood cells?

Accepted Answer

The cells will remain unchanged in size.

Foundations of Anatomy & Physiology: Homeostasis, Chemistry, and Cell Biology

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