Q: Which of the following equations represents the calculation of molarity?

$M = \frac{\text{moles of solute}}{\text{liters of solution}}$

Question 1

Which of the following best describes the fluid mosaic model of the plasma membrane?

Accepted Answer

A dynamic bilayer of phospholipids with embedded proteins and cholesterol.

Question 2

A patient with severe burns is losing large amounts of fluids and proteins from damaged cells. Which property of the plasma membrane is most compromised in this scenario?

Accepted Answer

Selective permeability

Question 3

Which component of the plasma membrane increases its stiffness and stability?

Accepted Answer

Cholesterol

Question 4

Which type of membrane protein is primarily responsible for cell-to-cell recognition?

Accepted Answer

Glycoproteins

Question 5

A red blood cell is placed in a hypertonic solution. What is the most likely outcome?

Accepted Answer

The cell will shrink and undergo crenation.

Question 6

Which equation correctly expresses the relationship between solute concentration and water concentration in osmosis?

Accepted Answer

$C_{solute} \uparrow \Rightarrow C_{water} \downarrow$

Question 7

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

Accepted Answer

Synthesizing DNA within the nucleus

Question 8

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion requires carrier or channel proteins.

Question 9

Which of the following best describes osmosis?

Accepted Answer

Movement of water across a selectively permeable membrane from high water concentration to high solute concentration.

Question 10

A cell is placed in an isotonic solution. What will happen to the cell's volume?

Accepted Answer

It will remain unchanged.

Question 11

Which process directly uses ATP to move solutes across the plasma membrane?

Accepted Answer

Primary active transport

Question 12

Which of the following equations represents the calculation of molarity?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$

Question 13

Which type of vesicular transport moves substances into, across, and then out of the cell?

Accepted Answer

Transcytosis

Question 14

Which of the following is a real-life example of receptor-mediated endocytosis?

Accepted Answer

Internalization of low-density lipoproteins (LDL) by liver cells

Question 15

Which of the following best explains why water moves from areas of low solute concentration to areas of high solute concentration during osmosis?

Accepted Answer

Water moves to dilute the higher concentration of solute, achieving equilibrium.

Question 16

Which of the following is NOT a reason why active transport is required for some solutes?

Accepted Answer

The solute is able to move down its concentration gradient.

Question 17

Which type of endocytosis is referred to as 'cell eating' and is important for immune defense?

Accepted Answer

Phagocytosis

Question 18

If a cell's hydrostatic pressure equals its osmotic pressure, what is the net movement of water?

Accepted Answer

There is no net movement of water.

Question 19

Which of the following best describes the role of the extracellular matrix (ECM)?

Accepted Answer

It serves as a glue to hold cells together.

Question 20

Which of the following is a function of peripheral membrane proteins?

Accepted Answer

Acting as motor proteins for shape change during cell division

Cells: The Living Units – Structure and Function of Human Cells

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