q2 exam 2 random

Question 1

repressors

Answer 1

-bind to operators
-block RNA polymerase, preventing transcription

Question 2

corepressor

Answer 2

binds to and activates repressors if they default to off

Question 3

where does RNA polymerase bind?

Answer 3

the promoter (regulatory DNA sequence)

Question 4

prokaryotes genes default to

Answer 4

ON

Question 5

eukaryotes genes default to

Answer 5

OFF

Question 6

activators:

Answer 6

bind to repressors and INACTIVATE them (increasing transcription)

Question 7

start codon:

Answer 7

-AUG
-where ribosome initially attaches to begin translating mRNA

Question 8

where is TATA box located?

Answer 8

in promoter

Question 9

promoter:

Answer 9

starting point for RNA polymerase found before gene (includes TATAA sequence)

Question 10

reloading tRNA after translation

Answer 10

aminoacyl tRNA syntheses connects a specific amino acid

Question 11

Unlike DNA polymerase, RNA polymerase

Answer 11

can start a chain from scratch (does not need to add the 1st nucleotide onto a pre-existing primer)

Question 12

Many genes can give rise to 2+ different polypeptides depending on

Answer 12

which segments are treated as exons during RNA processing

Question 13

frameshift mutation occurs when

Answer 13

number of nucleotides inserted or deleted is not a multiple of 3

Question 14

stop codon cause

Answer 14

premature termination of the polypeptide

Question 15

Both repressible and inducible operons control gene expression at the level of __________.

Answer 15

transcription

Question 16

Both DNA methylation and histone deacetylation

Answer 16

repress transcription

Question 17

denaturing:

Answer 17

heat to separate DNA strands

Question 18

annealing

Answer 18

cool to allow primers to form H bonds with ends of target sequenc e

Question 19

elongation

Answer 19

DNA polymerase adds nucleotides to the 3’ end of each primer

Question 20

activators:

Answer 20

bind to repressors and INACTIVATE them (increasing transcription)

Question 21

activators:

Answer 21

bind to repressors and INACTIVATE them (increasing transcription)