Effect Of Osmotic Pressures- Lab 9

Question 1

Describe hypotonic solution

Answer 1

If there are more solutes inside the cell. As water enters, the cell expands. If the cell expands too much risking of burst called osmotic lysis.
Most bacteria live in hypotonic conditions.

Question 2

Describe hypertonic solutions

Answer 2

If there are more solutes inside the cell, water will flow out of the cell to dilute the solutes. As water leaves, the cell dehydrates in shrinks called plasmolysis.
This is used to inhibit bacterial growth.

Question 3

Describe facultative halophiles

Answer 3

No Salt in moderate salt

NaCl up to 10% or higher

Question 4

Describe obligate halophiles

Answer 4

High salt conditions
NaCl at least 9%
can live in saturated salt

Question 5

Why did staphylococcus epidermidis have the widest range of salt tolerance

Answer 5

Because it’s a bacterium that lives on the salty skin

Question 6

Is halobacterium salinarium an obligate halophile

Answer 6

Yes

Question 7

Describe isotonic solution

Answer 7

If the concentration of solute a on the outside of a cell equals that of the inside. (Net movement of water = zero)

Question 8

What condition did we address in lab?

Answer 8

Hypertonic