bacterial growth lqc 3a

Question 1

bacterial reproduction

Answer 1

Bacteria reproduce by binary fission, which is a type of asexual reproduction which produces two genetically identical cells.

Question 2

optimum temperature conditions for bacterial growth

Answer 2

For optimum enzyme activity, rate of reaction and growth/metabolism

Question 3

optimum pH for bacterial growth

Answer 3

For optimum enzyme activity, rate of reaction and growth/metabolism

Question 4

Optimum oxygen concentration (or no oxygen if bacteria are anaerobic ) for bacterial growth

Answer 4

For respiration to release energy for growth

Question 5

Optimum concentrations of glucose, nitrogen etc for bacterial growth

Answer 5

Glucose for respiration to release energy Nitrogen for making amino acids to make proteins for growth and to make DNA

Question 6

Moisture/water for bacterial growth

Answer 6

For cell function eg. hydrolysis reactions

Question 7

lag phase of growth of a bacterial culture graph

Answer 7

no change/increase in number of cells- cells adjust to conditions

Question 8

log/exponential phase of growth of a bacterial culture graph

Answer 8

number of cells increases- cells divide at fastest rate possible for the conditions- doubling each time

Question 9

stationary phase of growth of a bacterial culture graph

Answer 9

no change/ increase in number of cells- glucose is depleted, waste products build up, change in pH

Question 10

death phase of growth of a bacterial culture graph

Answer 10

number of cells decrease- number of cells dying is greater than number of new cells formed