GENETIC REGULATION PROKARYOTES QUIZ

Which of the following occur in the presence of glucose?

lac Z gene expression is increased

None of these

cAMP increases

Binding of CAP-cAMP complex to the promoter area decreases

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

no operon expression

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The lac operon is translated into __________ proteins.

2

3

4

1

TRUE ANSWER : ?
YOUR ANSWER : ?

What are genes?

All of these

A portion of a chromosome

The functional unit of inheritance

A fragment of DNA

TRUE ANSWER : ?
YOUR ANSWER : ?

Methylated gene are

dynamic

silent

either (a) or (b)

active

TRUE ANSWER : ?
YOUR ANSWER : ?

Enhancers differ from promoters in that

their orientation can be inverted without effect

they are restricted to a specific gene

they initiate transcription

they are adjacent to the start codon

TRUE ANSWER : ?
YOUR ANSWER : ?

A frameshift mutation occurs in the sigma subunit gene transcribed as part of SPOl early genes. What will be the immediate result?

Early genes will not be translated

Middle genes will not be transcribed

Infection will proceed as usual

The bacterial host will lyse immediately

TRUE ANSWER : ?
YOUR ANSWER : ?

Sex lethal (sxl) in Drosophila is transcribed when

the X autosome balance equals 0.5

None of these

the X autosome balance is 1 or greater

the X autosome balance is less than 0.5

TRUE ANSWER : ?
YOUR ANSWER : ?

The first protein complex to bind to the TATA box is

transcription factor IID

transcription factor IIB

all of these

transcription factor IIA

TRUE ANSWER : ?
YOUR ANSWER : ?

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

none of these

positive

negative

may be positive or negative

TRUE ANSWER : ?
YOUR ANSWER : ?

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