Q: Which of the following equations correctly represents the calculation of osmolarity ($$Osm) $$for a solution?

$$Osm = \frac{\text{number of solute particles}}{\text{volume of solution in liters}}$$

Question 1

Which of the following best describes the function of the Golgi apparatus in a typical eukaryotic cell?

Accepted Answer

It collects, sorts, packages, and distributes proteins and lipids.

Question 2

A red blood cell is placed in a solution and begins to swell and eventually bursts. Which of the following best describes the tonicity of the solution relative to the cell?

Accepted Answer

The solution is hypotonic.

Question 3

Which organelle is responsible for the synthesis of steroid hormones and detoxification of drugs in liver cells?

Accepted Answer

Smooth endoplasmic reticulum

Question 4

Which of the following statements about the plasma membrane is TRUE?

Accepted Answer

It is selectively permeable, allowing some substances to cross more easily than others.

Question 5

Which of the following best explains why ions such as Na+ and K+ cannot freely diffuse across the plasma membrane?

Accepted Answer

They are hydrophilic and require channel proteins to cross the hydrophobic core.

Question 6

Which process is responsible for the movement of glucose into intestinal epithelial cells against its concentration gradient, and what is the energy source for this process?

Accepted Answer

Secondary active transport; energy stored in the Na+ gradient

Question 7

A cell is observed to have an extensive network of microtubules and microfilaments. Which of the following is NOT a function of these cytoskeletal elements?

Accepted Answer

Synthesizing proteins

Question 8

Which of the following organelles contains hydrolytic enzymes and is responsible for breaking down damaged organelles and foreign particles?

Accepted Answer

Lysosome

Question 9

Which of the following best describes the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 10

Which of the following equations correctly represents the calculation of osmolarity ($$Osm) $$for a solution?

Accepted Answer

$$Osm = \frac{	ext{number of solute particles}}{	ext{volume of solution in liters}}$$

Question 11

Which of the following is a function of the nucleolus?

Accepted Answer

Synthesis of ribosomal RNA

Question 12

A patient is given an intravenous solution with an osmolarity of 400 mOsm. What effect will this solution have on the patient’s red blood cells?

Accepted Answer

Cells will shrink due to water loss.

Question 13

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

Accepted Answer

It maintains membrane fluidity.

Question 14

Which of the following processes requires energy directly from ATP hydrolysis?

Accepted Answer

Primary active transport

Question 15

Which of the following is TRUE regarding the sodium-potassium pump?

Accepted Answer

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

Question 16

Which of the following best describes the function of microvilli on the surface of intestinal epithelial cells?

Accepted Answer

Increasing surface area for absorption

Question 17

Which of the following is NOT a characteristic of facilitated diffusion?

Accepted Answer

It requires energy from ATP.

Question 18

Which of the following organelles is essential for the movement of chromosomes during cell division?

Accepted Answer

Centrioles

Question 19

Which of the following best describes exocytosis?

Accepted Answer

The process by which cells release substances into the extracellular fluid via vesicles.

Question 20

Which of the following is the correct sequence for the synthesis and secretion of a protein hormone?

Accepted Answer

Nucleus → Ribosome → Rough ER → Golgi apparatus → Vesicle → Plasma membrane

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