plasma membrane

Question 1

What is the primary function of the plasma membrane?

Answer 1

To regulate the passage of substances into and out of the cell.

Question 2

True or False: The plasma membrane is selectively permeable.

Answer 2

True

Question 3

What is the main component of the plasma membrane?

Answer 3

Phospholipids

Question 4

Fill in the blank: The plasma membrane is composed of a double layer of _________.

Answer 4

Phospholipids

Question 5

What are the two types of proteins found in the plasma membrane?

Answer 5

Integral proteins and peripheral proteins

Question 6

Which type of protein spans the entire lipid bilayer of the plasma membrane?

Answer 6

Integral proteins

Question 7

What is the function of integral proteins in the plasma membrane?

Answer 7

They transport molecules across the membrane.

Question 8

Fill in the blank: The plasma membrane is also known as the ________.

Answer 8

Cell membrane

Question 9

What is the role of cholesterol in the plasma membrane?

Answer 9

It helps maintain the fluidity and stability of the membrane.

Question 10

True or False: The plasma membrane is found in both prokaryotic and eukaryotic cells.

Answer 10

True

Question 11

What is the purpose of carbohydrates attached to proteins on the plasma membrane?

Answer 11

They are involved in cell recognition and communication.

Question 12

What is the term for the movement of molecules from an area of high concentration to an area of low concentration across the plasma membrane?

Answer 12

Diffusion

Question 13

Which type of transport requires energy expenditure to move molecules against their concentration gradient across the plasma membrane?

Answer 13

Active transport

Question 14

What is the term for the engulfing of large particles or even entire cells by the plasma membrane?

Answer 14

Endocytosis

Question 15

True or False: Exocytosis is the process by which cells release substances from vesicles through fusion with the plasma membrane.

Answer 15

True

Question 16

What is the name of the process in which cells communicate with each other by direct contact through proteins on their plasma membranes?

Answer 16

Cell-cell recognition

Question 17

What is the difference between simple diffusion and facilitated diffusion across the plasma membrane?

Answer 17

Facilitated diffusion requires the assistance of transport proteins.

Question 18

What is the role of aquaporins in the plasma membrane?

Answer 18

They facilitate the transport of water molecules across the membrane.

Question 19

Fill in the blank: The movement of substances across the plasma membrane is driven by differences in _________.

Answer 19

Concentration gradients

Question 20

What is the term for the process by which cells take up specific molecules by engulfing them in vesicles formed from the plasma membrane?

Answer 20

Receptor-mediated endocytosis

Question 21

Which type of transport involves the movement of large molecules or particles into the cell by vesicle formation?

Answer 21

Bulk transport

Question 22

True or False: The plasma membrane helps maintain the internal environment of the cell by regulating the passage of ions and molecules.

Answer 22

True

Question 23

What is the term for the process of maintaining a stable internal environment within a cell despite external changes?

Answer 23

Homeostasis

Question 24

What is the name of the model that describes the plasma membrane as a fluid mosaic of phospholipids, proteins, and carbohydrates?

Answer 24

Fluid mosaic model