GENETIC REGULATION PROKARYOTES QUIZ

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

negative

none of these

positive

may be positive or negative

TRUE ANSWER : ?
YOUR ANSWER : ?

Genes which need to be coordinately regulated but are not in operons may be regulated by

GC regions

CAAT regions

common transcription factor binding domains

TATA boxes

TRUE ANSWER : ?
YOUR ANSWER : ?

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

It allows coordinating regulation of genes with a common function

An accident of evolution

None of these

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

TRUE ANSWER : ?
YOUR ANSWER : ?

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

bound to tryptophan

bound to both DNA and tryptophan

bound to neither tryptophan nor DNA

bound to DNA

TRUE ANSWER : ?
YOUR ANSWER : ?

The lac operon is translated into __________ proteins.

2

3

1

4

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a transcription factor?

Helix-turn-helix proteins

Zinc finger proteins

Steroid hormones

Leucine zipper proteins

TRUE ANSWER : ?
YOUR ANSWER : ?

What are genes?

A portion of a chromosome

A fragment of DNA

All of these

The functional unit of inheritance

TRUE ANSWER : ?
YOUR ANSWER : ?

The first protein complex to bind to the TATA box is

transcription factor IIB

transcription factor IID

transcription factor IIA

all of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Alternate splicing of RNA transcripts is a mechanism to regulate

DNA methylation

leucine zippers

tubulin

tachykinins

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not part of the lac operon?

O

none of these

I

P

TRUE ANSWER : ?
YOUR ANSWER : ?