Gene Expression In Prokaryotes

Question 1

What is gene expression? (Phenotype)

Answer 1

• the appearance of a characteristic or effect that is linked to a particular gene

Question 2

What is gene expression in prokaryotes?

Answer 2

• gene expression can be controlled during transcription, during translation, and after the synthesis of a protein
• jeans are grouped together and regulated as a group of genes (OPERON)

Question 3

What helps to speed up transcription in prokaryotes of gene expression?

Answer 3

• the CAP binding site

Question 4

What happens in the absence of lactose?

Answer 4

• repressor is going to the operator site and stops the transcription of the genes (operon)

Question 5

How is the lac operon activated?

Answer 5

• in the presence of lactose

Question 6

What is the negative and positive feedback loop in the lac operon?

Answer 6

Negative:
• slows down (NO LACTOSE)

Positive:
• “go go go”

Question 7

What is gene expression in eukaryotes?

Answer 7

• regulation can occur before transcription, during, after, during translation, and after translation
• there are no operons in eucaryotic genomes as genes are regulated individually with its own promoter