$$ \text{Rate} = k \cdot [\text{Enzyme}] $$

Question 1

Which of the following best describes the difference between anatomy and physiology?

Accepted Answer

Anatomy is concerned with the structure of body parts, whereas physiology focuses on their function.

Question 2

Which of the following is the correct sequence for the levels of organization in the human body, from simplest to most complex?

Accepted Answer

Molecule, cell, tissue, organ, organ system, organism

Question 3

Homeostasis is best defined as:

Accepted Answer

The maintenance of a relatively stable internal environment despite external changes.

Question 4

Which of the following is NOT a component of a typical control system involved in homeostasis?

Accepted Answer

Stimulus

Question 5

A patient’s blood glucose is measured several times throughout the day. Which statement best describes the expected results?

Accepted Answer

Blood glucose will fluctuate within the normal range around the set point.

Question 6

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

Accepted Answer

Sweating to reduce body temperature when overheated.

Question 7

Which statement about protein binding is correct?

Accepted Answer

A ligand binds to a protein at a binding site, and the interaction is determined by specificity, affinity, saturation, and competition.

Question 8

If two proteins can bind to the same ligand, what happens to the saturation of each protein?

Accepted Answer

Saturation of each protein decreases because the ligand is shared between them.

Question 9

Which equation correctly represents the relationship between reaction rate and enzyme concentration, assuming substrate is not limiting?

Accepted Answer

$$ 	ext{Rate} = k \cdot [	ext{Enzyme}] $$

Question 10

Which of the following best describes the effect of an enzyme on a chemical reaction?

Accepted Answer

Enzymes decrease the activation energy, speeding up the reaction.

Question 11

A hydrolysis reaction involves:

Accepted Answer

The addition of water to break a molecule into two smaller molecules.

Question 12

Which of the following is true regarding the Na+/K+ pump?

Accepted Answer

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

Question 13

Which equation best represents osmotic pressure ($$ \Pi ) $$according to van't Hoff's law?

Accepted Answer

$$ \Pi = iCRT $$

Question 14

A red blood cell placed in a hypotonic solution will:

Accepted Answer

Burst due to water influx (hemolysis).

Question 15

Which of the following is a characteristic shared by all carrier-mediated transport mechanisms?

Accepted Answer

They exhibit specificity, saturation, and competition.

Question 16

Which of the following is an example of secondary active transport?

Accepted Answer

Glucose transport into the cell coupled with Na+ influx.

Question 17

Which statement about intercellular communication is correct?

Accepted Answer

Autocrine signaling affects the same cell that released the signal.

Question 18

Which of the following best describes the function of a ligand-gated ion channel?

Accepted Answer

It opens in response to ligand binding, allowing ions to flow across the membrane.

Question 19

Which of the following is a correct sequence of events in the cAMP signal transduction pathway?

Accepted Answer

Ligand binds receptor → G protein activated → Adenylate cyclase activated → cAMP produced → Protein kinase activated

Question 20

Which of the following best describes the effect of up-regulation of membrane receptors?

Accepted Answer

Cells increase the number of receptors, enhancing sensitivity to the ligand.

Step-by-Step Study Guidance for Human Anatomy & Physiology: Introduction to Human Physiology

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