Question 1

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

Accepted Answer

A process where the response opposes the original stimulus, returning the system to its set point.

Question 2

Which of the following is NOT a characteristic of living organisms?

Accepted Answer

Lack of energy requirement for survival

Question 3

A patient is experiencing acidosis. According to the bicarbonate buffer system, which direction will the following reaction shift to compensate? $$ \mathrm{H_2CO_3 \rightleftharpoons $$HCO_3$$^- + H^+} $$

Accepted Answer

Shift to the left, decreasing $$ \mathrm{H^+} $$ concentration

Question 4

Which of the following best explains why sodium ($$ \mathrm{Na^+} ) $$and potassium ($$ \mathrm{K^+} ) $$are distributed differently across the cell membrane?

Accepted Answer

The sodium-potassium pump actively transports $$ \mathrm{Na^+} $$ out and $$ \mathrm{K^+}  in$$, using ATP.

Question 5

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve sharing electrons; ionic bonds involve the transfer of electrons.

Question 6

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and why?

Accepted Answer

It will swell and possibly burst as water enters by osmosis.

Question 7

Which of the following is a function of microvilli on epithelial cells?

Accepted Answer

Increasing surface area for absorption

Question 8

Which phase of the cell cycle is characterized by DNA replication?

Accepted Answer

S phase

Question 9

Which of the following best describes the role of keratin in the epidermis?

Accepted Answer

Keratin forms a waterproof barrier to prevent water loss.

Question 10

A patient with severe burns covering 36% of their body surface area is at risk for which of the following complications due to loss of skin function?

Accepted Answer

Increased risk of dehydration and infection

Question 11

Which of the following best explains the function of desmosomes in epithelial tissue?

Accepted Answer

They anchor adjacent cells together, providing mechanical strength.

Question 12

Which of the following is a correct statement about the process of translation?

Accepted Answer

Translation is the process of synthesizing proteins from mRNA.

Question 13

Which of the following best describes the function of the sodium-potassium pump?

Accepted Answer

It uses ATP to move $$ \mathrm{Na^+} $$ out of the cell and $$ \mathrm{K^+} $$ into the cell against their gradients.

Question 14

Which of the following is a function of the skin's sebaceous glands?

Accepted Answer

Secreting sebum to lubricate and waterproof the skin

Question 15

Which of the following best describes the process of osmosis?

Accepted Answer

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

Question 16

Which of the following is a correct pairing of a macromolecule class and its general function in the body?

Accepted Answer

Proteins: catalyze biochemical reactions

Question 17

A patient is unable to sweat due to a genetic disorder. Which physiological function is most directly impaired?

Accepted Answer

Thermoregulation

Question 18

Which of the following best describes the role of tight junctions in epithelial tissue?

Accepted Answer

They prevent the passage of substances between adjacent cells.

Question 19

Which of the following is a correct statement about the process of apoptosis?

Accepted Answer

It is a programmed process that removes damaged or unnecessary cells.

Question 20

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

Accepted Answer

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

Anatomy & Physiology: Foundational Concepts, Chemistry, Cells, and Integumentary System

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