2.4.2 Gene Organization and Expression

Question 1

What are the characteristics of bacterial chromosomes and plasmids?

Answer 1

Question 2

Why are bacterial genome structures considered to be heterogeneous?

Answer 2

Question 3

What is horizontal gene transfer?

Answer 3

Acquiring DNA from environment

Question 4

Describe the characteristics of pathogenecity islands.

Answer 4

Question 5

Describe the process of replication for a bacterial chromosome.

Answer 5

Question 6

Describe the replication of plasmids.

Answer 6

Question 7

Describe the organization of Genes in bacteria.

Answer 7

Question 8

What are the two types of regulators in bacterial gene regulation?

Answer 8

Question 9

Describe the negative regulation of anabolic and catabolic operons.

Answer 9

Question 10

What occurs to the lac operon in the presence of lactose?

Answer 10

An inducer molecule binds to the repressor protein

Repressor can no longer bind to operator

Transcription occurs

Question 11

Describe the negative regulation of the lac operon.

Answer 11

Question 12

Describe the positive regulation of the lac operon by cAMP

Answer 12

Question 13

Describe the activity of the lac operon at various concentrations of glucose and lactose.

Answer 13

Question 14

Describe the Trp operon as an example of attenuation.

Answer 14

Question 15

Describe the role of tRNA in the Trp operon.

Answer 15

Question 16

Describe the importance to sensing the environment in the two component regulatory system.

Answer 16

Question 17

Give an example of environment sensing.

Answer 17

Question 18

What is quorum sensing.

Answer 18