cell membrane

Question 1

What is the primary function of the cell membrane?

Answer 1

To protect the cell and regulate what enters and exits.

Question 2

True or False: The cell membrane is selectively permeable.

Answer 2

True

Question 3

What are the main components of the cell membrane?

Answer 3

Phospholipids, proteins, cholesterol, and carbohydrates.

Question 4

Fill in the blank: The cell membrane is primarily composed of a __________ bilayer.

Answer 4

phospholipid

Question 5

What role do proteins play in the cell membrane?

Answer 5

They assist in transport, act as receptors, and provide structural support.

Question 6

Multiple Choice: Which of the following is NOT a function of the cell membrane? A) Transport B) Communication C) Photosynthesis D) Protection

Answer 6

C) Photosynthesis

Question 7

What is the fluid mosaic model?

Answer 7

A model that describes the structure of the cell membrane as a mosaic of various components that move fluidly.

Question 8

True or False: Cholesterol is found in the cell membrane and helps to maintain its fluidity.

Answer 8

True

Question 9

What is the role of carbohydrates in the cell membrane?

Answer 9

They are involved in cell recognition and signaling.

Question 10

Fill in the blank: The cell membrane helps maintain __________ by regulating ion concentrations.

Answer 10

homeostasis

Question 11

What is the difference between passive and active transport?

Answer 11

Passive transport does not require energy, while active transport requires energy to move substances against their concentration gradient.

Question 12

Multiple Choice: Which type of transport requires energy? A) Diffusion B) Facilitated diffusion C) Active transport D) Osmosis

Answer 12

C) Active transport

Question 13

What is osmosis?

Answer 13

The movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.

Question 14

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

Answer 14

False

Question 15

What are integral proteins?

Answer 15

Proteins that are embedded within the lipid bilayer and can span the membrane.

Question 16

Fill in the blank: __________ proteins are attached to the exterior or interior surfaces of the membrane.

Answer 16

Peripheral

Question 17

What is the function of receptor proteins?

Answer 17

To bind to signaling molecules and initiate a cellular response.

Question 18

Multiple Choice: Which of the following can pass through the cell membrane easily? A) Ions B) Small nonpolar molecules C) Large polar molecules D) All of the above

Answer 18

B) Small nonpolar molecules

Question 19

What is endocytosis?

Answer 19

The process by which cells engulf substances from the outside environment.

Question 20

What is exocytosis?

Answer 20

The process by which cells expel substances to the outside environment.

Question 21

True or False: The cell membrane can change its shape.

Answer 21

True

Question 22

What is the role of glycoproteins in the cell membrane?

Answer 22

They play a key role in cell recognition and immune response.

Question 23

Fill in the blank: The __________ model describes the dynamic nature of the cell membrane.

Answer 23

fluid mosaic

Question 24

What is facilitated diffusion?

Answer 24

The process of transporting substances across the cell membrane with the help of membrane proteins.

Question 25

Multiple Choice: What kind of molecules require facilitated diffusion? A) Oxygen B) Glucose C) Water D) All of the above

Answer 25

B) Glucose

Question 26

What is the significance of membrane potential?

Answer 26

It is the electrical charge difference across the cell membrane, crucial for nerve impulse transmission.

Question 27

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

Answer 27

False

Question 28

What are membrane proteins?

Answer 28

Proteins that are associated with or span the membrane of a cell.

Question 29

True or False: Membrane proteins can function as receptors.

Answer 29

True

Question 30

Fill in the blank: Membrane proteins can be classified into two main categories: ______ and ______.

Answer 30

integral, peripheral

Question 31

What is the primary function of integral membrane proteins?

Answer 31

To provide pathways for ions and molecules to cross the membrane.

Question 32

Multiple Choice: Which of the following is NOT a function of membrane proteins? A) Transport B) Enzymatic activity C) Genetic information storage D) Cell signaling

Answer 32

C) Genetic information storage

Question 33

What role do peripheral membrane proteins play?

Answer 33

They are involved in signaling and maintaining the cell's shape.

Question 34

True or False: All membrane proteins span the entire lipid bilayer.

Answer 34

False

Question 35

What is the significance of glycoproteins in the membrane?

Answer 35

They play a key role in cell recognition and signaling.

Question 36

Fill in the blank: Membrane proteins can undergo ______, allowing them to change shape and perform their functions.

Answer 36

conformational changes

Question 37

Multiple Choice: Which method is commonly used to study membrane proteins? A) PCR B) Western blotting C) Gel electrophoresis D) All of the above

Answer 37

D) All of the above

Question 38

What are transmembrane proteins?

Answer 38

Integral proteins that span the entire membrane, from one side to the other.

Question 39

True or False: Membrane proteins are static and do not move within the membrane.

Answer 39

False

Question 40

What is the function of channel proteins?

Answer 40

To provide a passageway for specific molecules to cross the membrane.

Question 41

Fill in the blank: Membrane proteins can be involved in ______, which allows cells to communicate with each other.

Answer 41

cell signaling

Question 42

What is the role of receptor proteins in the membrane?

Answer 42

To receive and transmit signals from the external environment to the cell.