BIO 111L: Cell Environments

Question 0

Which organism makes homeostasis possible?

Answer 0

Plasma membrane

Question 1

Homeostasis

Answer 1

Cell maintaining a steady state between its inside and outside environment

Question 2

Phospholipid

Answer 2

Allows passage for some molecules but not all.

Question 3

Permeability depends on…

Answer 3

Molecule size, charge, solubility.

Question 4

Molecule size

Answer 4

Small ones love across readily

Question 5

Charge

Answer 5

Uncharged molecules move across easily

Question 6

Solubility

Answer 6

Lipid molecules move across (glycerol)

Question 7

Active transport

Answer 7

Requires energy (ATP)

Question 8

Diffusion (Passive transport)

Answer 8

Movement from area of high concentration/pressure to area of low con/pres

Question 9

Osmosis (passive)

Answer 9

Diffusion that requires water.

Question 10

Hypertonic solution

Answer 10

Contains more dissolved substances than the inside of the cell. Fewer water molecules

Question 11

Hypotonic

Answer 11

Fewer dissolved substances in solution than inside of cell. Water flows into cell to dilute substances.

Question 12

Isotonic

Answer 12

Balance is achieved since concentration of dissolved substances inside cell and in solution are equal

Question 13

Molecular weight and size :in rate of transport

Answer 13

Small molecules diffuse fast

Question 14

Concentration gradients :in rate of transport

Answer 14

The greater the difference between concentration inside and outside of cell, the more rapid the movement across membrane.

Question 15

SAV ratio :in rate of transport

Answer 15

The higher the SAV ratio, the more efficient the transport of material

Question 16

Temperature :in rate of transport

Answer 16

Measure of kinetic energy of molecules. The high the temp., the fast the molecules move.