Cell Surface Membrane

Question 1

What is the primary function of the cell surface membrane?

Answer 1

To regulate the movement of substances in and out of the cell.

Question 2

True or False: The cell surface membrane is impermeable to all substances.

Answer 2

False.

Question 3

Fill in the blank: The cell surface membrane is composed mainly of __________ and proteins.

Answer 3

phospholipids

Question 4

What structure forms the bilayer in the cell surface membrane?

Answer 4

Phospholipids.

Question 5

What is the term for the model that describes the structure of the cell surface membrane?

Answer 5

Fluid mosaic model.

Question 6

Multiple Choice: Which of the following is NOT a component of the cell surface membrane? A) Cholesterol B) RNA C) Proteins D) Phospholipids

Answer 6

B) RNA.

Question 7

What role do proteins play in the cell surface membrane?

Answer 7

They serve as channels, receptors, and enzymes.

Question 8

True or False: Cholesterol helps to stabilize the fluidity of the cell membrane.

Answer 8

True.

Question 9

What is the significance of glycoproteins in the cell surface membrane?

Answer 9

They play a key role in cell recognition and signaling.

Question 10

Fill in the blank: The movement of water across the cell membrane is known as __________.

Answer 10

osmosis

Question 11

What type of transport requires energy to move substances across the cell membrane?

Answer 11

Active transport.

Question 12

Multiple Choice: Which of the following is an example of passive transport? A) Endocytosis B) Exocytosis C) Diffusion D) Sodium-potassium pump

Answer 12

C) Diffusion.

Question 13

What is the term for the process by which cells engulf large particles?

Answer 13

Phagocytosis.

Question 14

True or False: The cell surface membrane is static and does not change.

Answer 14

False.

Question 15

What is the role of membrane-bound enzymes?

Answer 15

To catalyze reactions at the cell surface.

Question 16

Fill in the blank: __________ are specialized proteins that act as receptors for signaling molecules.

Answer 16

Receptor proteins

Question 17

What is the effect of temperature on the fluidity of the cell membrane?

Answer 17

Higher temperatures increase fluidity, while lower temperatures decrease it.

Question 18

Multiple Choice: Which component of the membrane helps to prevent fatty acid chains from packing too closely together? A) Phospholipids B) Proteins C) Cholesterol D) Carbohydrates

Answer 18

C) Cholesterol.

Question 19

What is the term for the carbohydrate chains attached to proteins and lipids on the extracellular surface of the membrane?

Answer 19

Glycocalyx.

Question 20

True or False: The cell surface membrane can form vesicles.

Answer 20

True.

Question 21

What is the primary purpose of the sodium-potassium pump?

Answer 21

To maintain the electrochemical gradient across the membrane.

Question 22

Fill in the blank: The __________ of the membrane allows it to be selectively permeable.

Answer 22

phospholipid bilayer

Question 23

What is an example of a molecule that can easily pass through the cell membrane?

Answer 23

Oxygen.

Question 24

Multiple Choice: Which of the following processes involves the fusion of vesicles with the plasma membrane? A) Phagocytosis B) Pinocytosis C) Exocytosis D) Facilitated diffusion

Answer 24

C) Exocytosis.

Question 25

What is the role of aquaporins in the cell surface membrane?

Answer 25

To facilitate the transport of water molecules.