Question 1

A patient is experiencing difficulty with gas exchange in the lungs due to thickening of the simple squamous epithelium. Which physiological process is most directly impaired, and why?

Accepted Answer

Diffusion, because increased thickness reduces the rate of gas exchange according to Fick's Law: $$ J = -D \frac{\Delta C}{\Delta x} $$

Question 2

Which of the following best describes the structure-function relationship of the plasma membrane in animal cells?

Accepted Answer

It is made of phospholipids with hydrophilic heads and hydrophobic tails, forming a selective barrier for substances.

Question 3

A scientist is studying a molecule that is polar and forms hydrogen bonds with water. Which of the following best describes this molecule?

Accepted Answer

It is hydrophilic and likely to dissolve in water.

Question 4

Which of the following is an example of negative feedback in human physiology?

Accepted Answer

Insulin release lowering blood glucose after a meal.

Question 5

Which organelle is primarily responsible for detoxifying harmful substances in the liver?

Accepted Answer

Smooth endoplasmic reticulum

Question 6

A solution contains $$ \mathrm{NaCl} $$ dissolved in water. Which of the following best describes the type of bond between sodium and chloride ions in this solution?

Accepted Answer

Ionic bond

Question 7

Which of the following best explains why enzymes increase the rate of chemical reactions?

Accepted Answer

They lower the activation energy required for the reaction: $$ E_a $$ decreases.

Question 8

A patient has a genetic mutation that alters the sequence of nucleotides in a gene. Which of the following is the most likely consequence?

Accepted Answer

The structure and function of the corresponding protein may be altered.

Question 9

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

Accepted Answer

Catabolic reactions release energy by breaking down molecules, while anabolic reactions require energy to build molecules.

Question 10

Which of the following best explains why the phospholipid bilayer of the plasma membrane is selectively permeable?

Accepted Answer

The hydrophobic core prevents passage of polar molecules, while allowing nonpolar molecules to diffuse.

Question 11

A researcher adds more substrate to an enzyme-catalyzed reaction. What is the expected effect on the reaction rate, assuming the enzyme is not saturated?

Accepted Answer

The reaction rate will increase.

Question 12

Which of the following best describes the function of fibroblasts in connective tissue?

Accepted Answer

They produce collagen and extracellular matrix components.

Question 13

Which of the following is a property of water that makes it an excellent solvent for biological reactions?

Accepted Answer

It forms hydrogen bonds with polar molecules.

Question 14

A patient is diagnosed with fibrosis, which leads to excessive deposition of collagen in the extracellular matrix. What is a likely consequence for the affected tissue?

Accepted Answer

Decreased function due to loss of normal tissue structure.

Question 15

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP acts as the primary energy currency, transferring energy for cellular processes: $$ \mathrm{ATP} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy} $$

Question 16

Which of the following best explains why membrane carbohydrates are important for cell function?

Accepted Answer

They are involved in cell recognition and signaling.

Question 17

A patient is unable to properly digest fats due to a deficiency in a specific enzyme. Which organelle is most likely malfunctioning?

Accepted Answer

Lysosome

Question 18

Which of the following best describes the difference between epithelial and connective tissue?

Accepted Answer

Epithelial tissue covers surfaces and lines cavities, while connective tissue supports and binds other tissues.

Question 19

Which of the following best explains the effect of temperature on enzyme-catalyzed reactions?

Accepted Answer

Increasing temperature increases reaction rate up to an optimal point, after which the enzyme denatures and rate decreases.

Question 20

A patient has a mutation that causes the sodium-potassium pump ($$ \mathrm{Na^+/K^+} $$ ATPase) to malfunction. Which of the following is a likely consequence?

Accepted Answer

Cells will be unable to maintain proper ion gradients, affecting nerve impulse transmission.

Anatomy & Physiology: Core Concepts, Cell Structure, Chemistry, and Histology Study Guide

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