Lab 7

Question 1

Endospore

Answer 1

dormant cell that resists to many external conditions
- survives LONG time

Question 2

How is the bright field microscope with oil immersion objective used? **

Answer 2

It increases the resolving power of a microscope

Question 3

disiccated

Answer 3

culture is alive and is not capable of reproducing because it is dehydrated

Question 4

hypotonic, and Plasmoptysis

Answer 4

• water will rush in causing cell to swell
• take on so much water that it bursts

Question 5

hypertonic, also known as what?

Answer 5

cell loses so much water causes cell to shrink (also known as plasmolysis)

Question 6

what are 2 ways a cell can withstand hypertonic solution preventing plasmolysis? and the name ?

Answer 6

1. pump inorganic ions from environment to cell
2. they can synthesis or concentrate an organic solute (compatible solute)

Question 7

halophiles, neutrophils and acidophiles

Answer 7

halophiles - salt loving
neutrophiles - grow at optimal ph (most common)
acidophiles - grow at optimally pH less then 5.55

Question 8

What is optimal growth pH, minimal growth pH, maximum growth pH?

Answer 8

optimal - most favorable pH for growth of an organism
minimal - lowest pH organism can tolerate
maximum - highest pH an organism can tolerate

Question 9

types of acidophiles? and how do they survive?

Answer 9

• sulfolobus
• Ferroplasma
• Lactobacillus
• they survive by increase negative surface charge and stabilizes them