control of prokaryotic gene expression

Question 1

why is there a need for regulation of gene expression in prokaryotes?

Answer 1

• to allow conservation of energy & raw materials,
• to adapt to environmental changes quickly,
• & maintain balance between the various amounts of proteins in the cell

Question 2

how many levels can a bacterial cell control metabolism?

Answer 2

• 2 levels

Question 3

what are the 2 levels that a bacterial cell can exert control of metabolism?

Answer 3

1. by adjusting the production level of certain enzymes through regulating the expression of genes coding these enzymes
2. by increasing or decreasing the catalytic activity of its enzymes, as a form of post-translational control

Question 4

how does a bacterial cell exert control of its metabolism by adjusting the production level of certain enzymes through regulating the expression of genes encoding these enzymes?

Answer 4

• by increasing or preventing the transcription or translation of specific genes or operons

Question 5

what is the purpose of a bacterial cell exerting control of its metabolism by increasing or decreasing the catalytic activity of its enzymes?

Answer 5

• to allow the cell to respond quickly to short-term fluctuations in the concentration of a substance that its needs