2.2-2.3 Cell Size, Plasma Membrane

Why are small cells better for efficient exchange?

they have a smaller SA:V ratio

What is a phospholipid?

a modified fat

What is a phospholipid made out of? (3 things)

1. glycerol

2. 2 fatty acids

3. phosphate group

In an aqueous solution, what do phospholipids form?

bilayers

A phospholipid is what type of molecule?

amphipathic

The phosphate in a phospholipid is _____ charged and hydro_____.

negatively, philic

The fatty acids in a phospholipid are (polar/nonpolar) and hydro_____.

nonpolar, phobic

What must proteins embedded in the cell membrane have?

R-groups with matching properties

What type of protein R-group would attach to a phospholipid tail?

nonpolar

What type of protein R-group would attach to aqueous solution or a phospholipid’s phosphate group?

polar/charged

What are the components in the fluid mosaic model? (4)

1. cholesterol

2. glycoproteins

3. glycolipids

4. transport proteins

What is cholesterol’s job in the fluid mosaic model?

stability

What is the job of the glycoproteins in the fluid mosaic model?

identification

What is the job of the glycolipids in the fluid mosaic model?

identification

What are the jobs of the transport proteins in the fluid mosaic model? (2)

1. osmosis

2. diffusion

Why is the plasma membrane considered fluid?

its components shift and wiggle