Osmotic stress- quiz 4

Question 1

osmolarity

Answer 1

measure of all solute molecules in sol. moles/L

Question 2

osmosis

Answer 2

movement of water through membrane

Question 3

hyposmotic medium (hypotonic)

Answer 3

lower solute outside cell. uses cell wall. bursting.

Question 4

isosmotic

Answer 4

same solute in/ out of cell. no cell shrinkage

Question 5

hyperosmotic (hypertonic)

Answer 5

higher solute outside cell. import/synthesize compatible solutes. (potassium/proline) plasmolysis=shriveled.

Question 6

aquaporin

Answer 6

small pore lined with hydrophobic amino acids. allow only water to pass through.

Question 7

halophiles

Answer 7

-requre high nacl.

•produce glycerol instead of glycogen

Question 8

pH

Answer 8

-log(H+)
ph 7= 10^-7 M of protons
-10 fold change less each ph unit

Question 9

proteins require

Answer 9

normal ph. ph 5-8.5

Question 10

neutralophiles

Answer 10

ph 5-8, bacteria in gut

Question 11

acidophiles

Answer 11

ph 0-5. high amounts of tetraether lipids.

Question 12

alkalophiles

Answer 12

ph 9-11, soda lakes. diether lipids in membrane.

Question 13

archaeal membrane vs eukaryotes membrane

Answer 13

archaeal have ether bonds.

Question 14

added what to the plates

Answer 14

cyclohexamide (120 90 disturbed undisturbed)

Question 15

cells in distilled water …

Answer 15

blow up

Question 16

cells in salty solution…

Answer 16

shrivel up