Section 3.3

Question 1

Phospholipids

Answer 1

Have tails, make up cell membrane, contains 2 fatty acid chains, heads are hydrophobic (

Question 2

Fluid

Answer 2

Because individual phospholipids and proteins can move side-to-side within the phospholipid Bilayer like a liquid

Question 3

Mosaic

Answer 3

Because of the pattern produced different molecules

Question 4

Semipermeable Membrane

Answer 4

Ions, hydrophobic molecules larger than water, and large molecules such as proteins do not move through membrane on their own

Question 5

Types of transportation across cell membranes

Answer 5

Simple diffusion, osmosis

Question 6

Simple diffusion

Answer 6

Requires NO energy; molecules move from HIGH to LOW concentration.

Question 7

Simple diffusion through cell membrane

Answer 7

Solute moves DOWN concentration gradient (high to low). Only allows a few Solutes through

Question 8

Osmosis

Answer 8

Diffusion of water across a membrane; water move from HIGH concentration to LOW concentration

Question 9

Diffusion of H2O across membrane

Answer 9

High H2O concentration –> low solute concentration

Low H2O concentration –> high solute concentration

Question 10

Aquaporins

Answer 10

Water channels; protein pores used during osmosis

Question 11

Direction of Osmosis

Answer 11

Depends on concentration of Solutes on each side of membrane

Question 12

3 solutions of osmosis that cause water to move

Answer 12

Hypotonic, hypertonic, isotonic

Question 13

Hypotonic

Answer 13

Less solute, more water (plasmolysis)

Question 14

Hypertonic

Answer 14

Lots of solute, little water (cytolysis) (explode)

Question 15

Isotonic

Answer 15

Solute levels equal inside and out (no net movement)

Question 16

Plasma Membrane

Answer 16

Considered “fluid mosaic model”; “gateway” of the cell. Consists of the Phospholipid Bilayer