Diffusion And Osmosis

Question 0

Factors that influence diffusion

Answer 0

Concentration gradient
Number of transport proteins
Charge and polarity of molecules

Question 1

Diffusion

Answer 1

Moving from an area of high concentration to low concentration

Question 2

Osmosis

Answer 2

Diffusion of water; movement if water across a selectively permeable membrane from an area of higher to lower water concentration

Question 3

Factors that influence osmosis

Answer 3

Concentration gradient between cytosol and solution in which the cell is immersed

Question 4

Active transport

Answer 4

Require expenditure if cellular energy; substance moves up its concentration gradient or involves a vesicle

Ex: primary, secondary, vesicular (exocytosis, endocytosis)

Question 5

Passive transport

Answer 5

Does not require expenditure of cellular energy; substance moves in or out, down its concentration gradient

Ex: diffusion (simple or facilitated), osmosis

Question 6

Hypertonic

Answer 6

Cell has more concentrated water. So water moves out; crenation- cell shrivels

Ex: 80 nacl, 20 water

Question 7

Hypotonic

Answer 7

Cell has less concentration of water so water moves in; cell swells and bursts (lysis)

Ex: blood cell in pure water

Question 8

Isotonic

Answer 8

No net movement; same concentration in and out

Question 9

Tonicity

Answer 9

Ability of a solution to change volume or pressure of the cell by osmosis