Final Pt. 2

Question 1

What is a operon?

Answer 1

unit of genetic function found in bacteria, consisting of a promoter (more than one gene) , an operator (ON/OFF switch), and a coordinately regulated cluster of genes whose products function in a common pathway

Question 2

Inducible vs. Respressible operon

Answer 2

Inducible- usually off, turn on (catabolic)
Repressible- usually on, repress (anabolic)

Question 3

steps of TRP repressible operon?

Answer 3

1. up tryphotfan
2. active trp repressor, binds to operator
3. low transcription by RNA Poly 3
4. low trp pathway enzymes
5. low trp systheisi

Question 4

steps of lactose inducible operon?

Answer 4

1. up lactose
2. up allolactose, binds to repressor
3. down active lac repressor
4. up transcription by RNA Poly 3
5. up lactose enezyme path
6. up hydrolysis of lactose to glucose

Question 5

allosteric inhibtion?

Answer 5

binds to inactive form of portein to keep inactive

Question 6

histone aceytlation?

Answer 6

increases avlibtliy of euchromation

Question 7

histone methylation?

Answer 7

decreases avalibility of DNA- more heterochromatin

Question 8

DNA methylation often occurs in-

Answer 8

logn stretches of C and G