Cycle 8

Question 1

What is the role of allolactose in the Lac Operon?

Answer 1

A: Allolactose binds to the lac repressor, causing it to release from the operator, allowing transcription.

Question 1

What happens when lactose is absent in the Lac Operon?

Answer 1

A: The lac repressor binds to the operator, blocking transcription.

Question 2

What is a mutation in lacI gene?

Answer 2

A: A lacI- mutation prevents the repressor from binding, causing continuous transcription of the Lac Operon.

Question 3

What is the difference between prokaryotic and eukaryotic gene expression?

Answer 3

Prokaryotes regulate gene expression via operons, while eukaryotes use more complex regulatory mechanisms.

Question 4

What is RNA splicing?

Answer 4

: RNA splicing removes introns and joins exons to form mature mRNA.

Question 5

What does the Hayflick limit describe?

Answer 5

A: The Hayflick limit is the maximum number of times a cell can divide before aging.

Question 5

What does the term “totipotent” refer to?

Answer 5

: Totipotent cells can form an entire organism, like a zygote.

Question 6

Q: What is the function of telomerase?

Answer 6

A: Telomerase adds repetitive sequences to telomeres to prevent chromosome degradation.

Question 6

What is CRISPR-Cas9 used for in gene editing?

Answer 6

A: CRISPR-Cas9 is used to cut DNA at specific sites for gene editing, such as treating sickle cell disease.