Part 3 Of Cellular Structure And Function

Question 1

What is the plasma membrane?

Answer 1

The plasma membrane is a thin, flexible boundary between a cell and its environment that allows waste and other products to leave the cell.

Question 2

What is homeostasis?

Answer 2

Homeostasis is the maintenance of an organism’s internal environment.

Question 3

What is selective permeability?

Answer 3

Selective permeability is a key property of the plasma membrane that allows some, not all, substances to enter and leave the cell.

Question 4

What are the four properties of the cell membrane?

Answer 4

1. Made of phospholipids
2. Arranged in a bilayer
3. Semi-permeable
4. Fluid Mosaic Model

Question 5

What is diffusion?

Answer 5

Diffusion is the movement of particles from an area where they are more concentrated to an area where they are less concentrated.

Question 6

What is active transport?

Answer 6

Active transport is the process of moving substances across the plasma membrane against their concentration gradient.

Question 7

What is the structure of a phospholipid?

Answer 7

A phospholipid consists of a head made of a phosphate group and glycerol.