GENETIC REGULATION PROKARYOTES QUIZ

Sex determination in Drosophila involves

gene amplification

alternate splicing

none of these

methylation

TRUE ANSWER : ?
YOUR ANSWER : ?

The lac operon is translated into __________ proteins.

1

2

4

3

TRUE ANSWER : ?
YOUR ANSWER : ?

DNA is methylated at

AC sequences

CAAT sequences

TATA sequences

CG sequences

TRUE ANSWER : ?
YOUR ANSWER : ?

Sex hormones activate transcription of specific genes by

binding to RNA polymerase

binding to DNA promoter region

binding to DNA enhancer region

binding to a transcription factor

TRUE ANSWER : ?
YOUR ANSWER : ?

A mutation in the tip binding site of the repressor would result in

inducible trp operon expression

constitutive trp operon expression

None of these

no operon expression

TRUE ANSWER : ?
YOUR ANSWER : ?

Catabolite activating protein exerts __________ control on transcription of the lac operon genes.

positive

may be positive or negative

negative

none of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Why are several structural genes regulated as a unit in bacteria?

An accident of evolution

It allows coordinating regulation of genes with a common function

None of these

The bacteria chromosome is so small; many different genes must be controlled by the same promoter

TRUE ANSWER : ?
YOUR ANSWER : ?

Methylated gene are

dynamic

either (a) or (b)

silent

active

TRUE ANSWER : ?
YOUR ANSWER : ?

In the presence of tryptophan in the cell, the repressor is __________

bound to neither tryptophan nor DNA

bound to tryptophan

bound to DNA

bound to both DNA and tryptophan

TRUE ANSWER : ?
YOUR ANSWER : ?

In the presence of high levels of tryptophan

attenuator allows transcription of trp structural genes

attenuator terminates transcription

None of these

attenuator propogates transcription

TRUE ANSWER : ?
YOUR ANSWER : ?