GENETIC REGULATION PROKARYOTES QUIZ

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

none of these

P

I

O

TRUE ANSWER : ?
YOUR ANSWER : ?

The first protein complex to bind to the TATA box is

transcription factor IIB

all of these

transcription factor IID

transcription factor IIA

TRUE ANSWER : ?
YOUR ANSWER : ?

Methylated gene are

either (a) or (b)

active

silent

dynamic

TRUE ANSWER : ?
YOUR ANSWER : ?

Enhancers differ from promoters in that

they are adjacent to the start codon

they are restricted to a specific gene

their orientation can be inverted without effect

they initiate transcription

TRUE ANSWER : ?
YOUR ANSWER : ?

What are genes?

A portion of a chromosome

A fragment of DNA

The functional unit of inheritance

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Sex hormones activate transcription of specific genes by

binding to a transcription factor

binding to DNA promoter region

binding to RNA polymerase

binding to DNA enhancer region

TRUE ANSWER : ?
YOUR ANSWER : ?

The lac operon is translated into __________ proteins.

2

1

3

4

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following occur in the presence of glucose?

cAMP increases

None of these

Binding of CAP-cAMP complex to the promoter area decreases

lac Z gene expression is increased

TRUE ANSWER : ?
YOUR ANSWER : ?

DNA is methylated at

CAAT sequences

CG sequences

AC sequences

TATA sequences

TRUE ANSWER : ?
YOUR ANSWER : ?

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

negative

positive

none of these

may be positive or negative

TRUE ANSWER : ?
YOUR ANSWER : ?

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