Question 1

Which of the following best describes the primary function of the sodium-potassium pump ($$\mathrm{Na^+/K^+}$$ ATPase) in maintaining cellular homeostasis?

Accepted Answer

It uses ATP to actively transport $$3$$ sodium ions out of the cell and $$2$$ potassium ions into the cell, maintaining electrochemical gradients.

Question 2

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

Accepted Answer

The cell will swell and may burst because water will move into the cell by osmosis.

Question 3

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Citric Acid Cycle $$\rightarrow$$ Electron Transport Chain

Question 4

Which of the following best explains why water is considered a unique molecule in biological systems?

Accepted Answer

It has a high heat capacity, is an excellent solvent, and forms hydrogen bonds, allowing it to moderate temperature and dissolve many substances.

Question 5

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information

Question 6

A patient has a genetic mutation that prevents the production of mRNA from DNA. Which cellular process will be directly affected?

Accepted Answer

Translation, because mRNA is required as a template for protein synthesis.

Question 7

Which of the following best describes the difference between negative and positive feedback mechanisms in homeostasis?

Accepted Answer

Negative feedback reverses a change to maintain stability, while positive feedback amplifies a change until a specific event occurs.

Question 8

Which of the following is a correct example of a covalent bond in a biological molecule?

Accepted Answer

The bond between two hydrogen atoms in a water molecule ($$\mathrm{H_2O})$$

Question 9

Which of the following best describes the role of phospholipids in the plasma membrane?

Accepted Answer

They create a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward, allowing selective permeability.

Question 10

Which of the following statements about the epidermis is correct?

Accepted Answer

It is avascular and consists mainly of stratified squamous epithelial cells.

Question 11

Which of the following best explains why the palms face forward in the anatomical position?

Accepted Answer

To ensure the forearm bones (radius and ulna) are parallel, providing a standard reference for anatomical terminology.

Question 12

Which of the following is a distinguishing feature of nucleic acids compared to other macromolecules?

Accepted Answer

They store and transmit genetic information using sequences of nucleotides.

Question 13

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules from high to low concentration through a membrane protein, without using ATP.

Question 14

Which of the following is a correct statement about the dermis?

Accepted Answer

It is composed of two layers: the papillary layer (areolar connective tissue) and the reticular layer (dense irregular connective tissue).

Question 15

Which of the following best explains why active transport is necessary for certain cellular processes?

Accepted Answer

It enables cells to move substances against their concentration gradient, which requires energy in the form of ATP.

Question 16

Which of the following best describes the process of transcription?

Accepted Answer

The copying of genetic information from DNA to mRNA in the nucleus.

Question 17

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

Accepted Answer

Regulation of body temperature, where sweating cools the body when it becomes too hot.

Question 18

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

Accepted Answer

DNA is double-stranded and stores genetic information; RNA is single-stranded and helps in protein synthesis.

Question 19

Which of the following best explains the importance of the dermal papillae in the skin?

Accepted Answer

They increase the surface area for exchange of gases and nutrients between the epidermis and dermis.

Question 20

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

Accepted Answer

It occurs at the ribosome, where mRNA is used as a template to assemble amino acids into a protein.

Anatomy & Physiology: Organization, Chemistry, and the Integumentary System

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