Regulation of gene expression

Question 1

What is the role of the lactose and the lac operon

Question 2

What is the cAMP

Question 3

gene expression

Answer 3

Transcribing and translating a gene

Question 4

Gene regulation

Answer 4

Controlling of and when a gene is expresses, how much RNA / protein products will be produced

Question 5

Inducer

Answer 5

A substance that causes the expression to begin

Question 6

Inducible proteins

Answer 6

Starts when the protein is present.

Question 7

Enhancer

Answer 7

DNA sequences that bind transcription factors to activate

Question 8

Silencer

Answer 8

binding transcription factor that represses( reduces) transcription

Question 9

Negative feedback loops vs positive feedback loops

Answer 9

Negative feedback gives a a reduced production of the product

Question 10

Does prokaryotic have less steps …. WHY

Answer 10

Because mRNA can be rapidly translated as soon as it being transcribed

Question 11

Negative regulation

Answer 11

On and constitutive blocks transcription

Question 12

Positive regulation

Answer 12

Off and is inducible. Stimulates transcription

Question 13

Operon

Answer 13

non transcribed DNA its a line of protomer and operator followed by two or more genes. Stops at the terminator

Question 14

Advantages and disadvantages of Operons

Answer 14

Advantages- Have a good set of produced genes. Efficient
Disadvantages- Only come in sets so its difficult to just get a copy of 1.

Question 15

B galactoiclase

Answer 15

is one enzyme that can digest one lactase molecule into two glucoses.

Question 16

Talk about lactose

Answer 16

It’s not always present and doesn’t always have to produce.

Question 17

Sigma factors

Answer 17

Bind polymereases and direct them to promoters

Question 18

What happens if glucose levels are low

Answer 18

Produce cyclic adenosine monophosphate cAMP

Question 19

Absense of lactose

Answer 19

Binds to a lac operon and prevents RNA synthase from binding to the promoter

Question 20

B galactosidase is

Answer 20

is a channel protein

Question 21

How many genes are transcribed per RNA polymerase.

Answer 21

3 genes transcribed each time on the lac

Question 22

Why is trp operon repressible

Answer 22

to build up extra trp

Question 23

What kind of feedback loop is trp

Answer 23

hint: on and off