Unit 2: Environmental Control Of Metabolism In Microorganisms

Question 1

Death Phase

Answer 1

Phase of microorganism growth in which death rate of cells exceeds the rate of cell division.

Question 2

Exponential Growth

Answer 2

Growth phase of microorganisms involving a rapid geometric increase in numbers.

Question 3

Generation Time

Answer 3

Time taken for a microorganism cell to divide.

Question 4

Growth Medium

Answer 4

Substance in which microorganisms are encouraged to grow.

Question 5

Inducer

Answer 5

Substance that causes a gene to be expressed, often leading to the production of an enzyme

Question 6

Lag Phase

Answer 6

Earliest growth stage in microorganisms.

Question 7

Log Phase

Answer 7

Exponential phase of microorganism growth.

Question 8

Precursor

Answer 8

Substance needed to start a metabolic pathway.

Question 9

Secondary Metabolite

Answer 9

Substance produced during the stationary phase of growth of a culture of microorganisms.

Question 10

Stationary Phase

Answer 10

Phase of microorganism growth during which secondary substances can be made.

Question 11

Sterile

Answer 11

Not containing contaminating microorganisms.

Question 12

Total Cell Count

Answer 12

Total number of cells in a culture including viable (live) cells and dead cells.

Question 13

Viable Cell Count

Answer 13

Number of live cells from a total cell count.

Question 14

Beef Extract

Answer 14

Complex growth medium for microorganisms