Q: Which formula correctly represents the calculation of the concentration gradient for diffusion?

$$ \text{Concentration Gradient} = \frac{C_{\text{high}} - C_{\text{low}}}{\text{Distance}} $$

Question 1

Which of the following best describes the plasma membrane's structure and its role in cellular function?

Accepted Answer

It is a selectively permeable phospholipid bilayer that regulates the movement of substances into and out of the cell.

Question 2

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

Accepted Answer

It will shrink because water leaves the cell to balance the higher solute concentration outside.

Question 3

Which organelle is primarily responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondria

Question 4

Facilitated diffusion across the cell membrane requires which of the following?

Accepted Answer

Carrier or channel proteins

Question 5

Which formula correctly represents the calculation of the concentration gradient for diffusion?

Accepted Answer

$$ 	ext{Concentration Gradient} = \frac{C_{	ext{high}} - C_{	ext{low}}}{	ext{Distance}} $$

Question 6

Which process describes the movement of large molecules into the cell by engulfing them in a vesicle?

Accepted Answer

Endocytosis

Question 7

A neuron transmits electrical impulses. Which cellular structure is most directly involved in this function?

Accepted Answer

Plasma membrane

Question 8

Which of the following best explains why the plasma membrane is described as 'selectively permeable'?

Accepted Answer

It allows certain molecules to pass while restricting others based on size, charge, and polarity.

Question 9

Which organelle is responsible for packaging and sorting proteins and lipids for transport within or outside the cell?

Accepted Answer

Golgi apparatus

Question 10

A patient is given an intravenous solution that is hypotonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

Cells will swell and may burst due to water entering.

Question 11

Which of the following is NOT a function of plasma membrane proteins?

Accepted Answer

Synthesizing ATP from glucose

Question 12

Which process requires energy input from the cell to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 13

Which equation best represents the relationship for osmotic pressure ($\Pi$) in terms of solute concentration ($C$), gas constant ($R$), and temperature ($T$)?

Accepted Answer

$$ \Pi = CRT $$

Question 14

Which organelle contains digestive enzymes and is responsible for breaking down cellular waste?

Accepted Answer

Lysosome

Question 15

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

Accepted Answer

Increase surface area for absorption

Question 16

Which process is used by white blood cells to engulf bacteria and other foreign particles?

Accepted Answer

Phagocytosis

Question 17

Which of the following statements about the nucleus is correct?

Accepted Answer

It contains the cell's genetic material (DNA and RNA).

Question 18

Which of the following is a function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Protein synthesis due to attached ribosomes

Question 19

Which type of membrane transport is described by the movement of water across a semipermeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 20

Which of the following best explains why potassium ions require a pump to move across the plasma membrane?

Accepted Answer

Potassium ions move against their concentration gradient, requiring energy.

Cells: Structure, Function, and Membrane Transport (Chapter 3 Study Notes)

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