Gene expression

Question 1

Is every gene expressed

Answer 1

No

Question 2

Why is gene regulation paired with gene expression

Answer 2

In order for a gene to be expressed, it has to be regulated

Question 3

If an hair cell was present in stomach DNA would it be expressed

Answer 3

No since it would be wasteful

Question 4

Why in prokaryotes does transcription and translation happen stimutainously

Answer 4

This is due to no nucleus in the prokaryote that in the cytoplasm that these 2 processes happen fast

Question 5

Why does eukaryotes take longer to do translation and transcription

Answer 5

-mRNA traveling through nucleus
-Post transcriptional process

Question 6

How does gene regulation involve or impact transcription

Answer 6

Regulatory proteins (transcription factors) are needed in eukaryotic cells where it can bind to the promoter while other transcription factors can bind there to repress it

Question 7

Do transcription factors play a role if a gene is expressed

Answer 7

Yes

Question 8

What gene regulator does prokaryote have

Answer 8

Operon

Question 9

What is a operon

Answer 9

A regulated cluster of genes along with a promoter and a operator

Question 10

What is a type of operon

Answer 10

Lac operon

Question 11

How does the represser prevent RNA polymerase from working

Answer 11

Binding to a sequence called the operator and since the operator doesn’t let the RNA polymerase work the genes won’t be expressed so it won’t be transcribed into an mRNA

Question 12

When lactose is around does the bacteria want the enzyme to break down the sugar in dairy

Answer 12

Yes it does so the bacteria would turn a gene on to be expressed

Question 13

How does the lac operon repressor get expressed

Answer 13

-A form of lactose binds to the repressor so it get out of the RNA polymerase way so it can transcribe

Question 14

Can the enzyme for lactose only be expressed when it is around

Answer 14

Yes the repressor can’t block when lactose is around

Question 15

Is an enzyme for lactose made when there is no lactose around

Answer 15

No because the repressor binds to the operator

Question 16

is lac operon a positive or negative control

Answer 16

Positive control

Question 17

Does lack of AA tryptophan (TRP) cause an inactive (not blocking) repressor or active (blocking repressor)

Answer 17

Inactive repressor as TRP is made continuously

Question 18

What is bound to the operator when there is enough trp

Answer 18

a repressor and tryptophan compressor

Question 19

What is an restriction enzyme

Answer 19

special types of enzymes from unique bacteria that scietnist use to cut DNA

Question 20

Do restriction enzymes only cut at a specific sequence

Answer 20

Yes

Question 21

What is unique about the sequences used to cut the DNA

Answer 21

they are palindromic sequences (identical backwards)