Bio chap 5 test

Question 1

Identify the type of molecule that builds all cell membranes

Answer 1

Phosphorus

Question 2

hydrophilic and hydrophobic

Answer 2

Hydrophilic: water loving (attracted to water)
Hydrophobic: water fearing (repel water)

Question 3

which parts of phospholipids are hydrophilic and which parts are hydrophobic

Answer 3

Tails = hydrophobic; Head = hydrophobic

Question 4

Explain how the structure of phospholipids effects how the cell membrane is built

Answer 4

The phospholipids create a bi layer by the heads facing the outside water while the tails face the inside

Question 5

Explain why the cell membrane is described as a “fluid mosaic”

Answer 5

The cell membrane is flexible like water and mosaic because of embedded proteins and carbohydrates

Question 6

Describe how cell membranes are selectively permeable

Answer 6

Plasma membrane allows some materials to pass while excluding others

Question 7

Explain the meaning of the term concentration gradient

Answer 7

difference in concentration of molecules across a distance

Question 8

Describe how carrier proteins are used in facilitated diffusion

Answer 8

Molecules bind to carrier protein; transport across, released into the cell

Question 9

Explain how carrier proteins exhibit selective permeability

Answer 9

some are specific to molecules that are allowed to pass through

Question 10

Identify the solute conditions under which the sodium-potassium pump occurs

Answer 10

Low concentration to high concentration

Question 11

Explain the difference between the two different types of endocytosis.

Answer 11

Pinocytosis = fluids using vesicles
Phagocytosis = large particles or whole cells using vesicles