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Genetic Regulation Prokaryotes MCQ Questions & Answers

Genetic Regulation Prokaryotes MCQs : This section focuses on the "Genetic Regulation Prokaryotes". These Multiple Choice Questions (MCQs) should be practiced to improve the Genetic Regulation Prokaryotes skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

The lac operon is transcribed in which segments?

A. 1
B. 2
C. 3
D. 4

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Question 2

The lac operon is translated into __________ proteins.

A. 1
B. 2
C. 3
D. 4

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Question 3

What are genes?

A. The functional unit of inheritance
B. A fragment of DNA
C. A portion of a chromosome
D. All of the above

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Question 4

Transcription factors are

A. regions of DNA in the promoter area
B. regions of DNA in the enhancer area
C. any protein which binds to DNA
D. proteins which bind DNAand initiate transcription

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Question 5

In the presence of high levels of tryptophan

A. attenuator allows transcription of trp structural genes
B. attenuator propogates transcription
C. attenuator terminates transcription
D. none of the above

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Question 6

Which of the following occur in the presence of glucose?

A. lac Z gene expression is increased
B. cAMP increases
C. Binding of CAP-cAMP complex to the promoter area decreases
D. none of the above

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Question 7

Tubulin is regulated by

A. binding of tubulin to tubulin mRNA
B. splicing of the tubulin transcript
C. binding of tubulin to the tubulin translational product
D. binding of tubulin to DNA

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Question 8

Sex hormones activate transcription of specific genes by

A. binding to a transcription factor
B. binding to RNA polymerase
C. binding to DNA enhancer region
D. binding to DNA promoter region

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Question 9

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

A. bound to tryptophan
B. bound to DNA
C. bound to both DNA and tryptophan
D. bound to neither tryptophan nor DNA

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Question 10

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

A. common transcription factor binding domains
B. TATA boxes
C. CAAT regions
D. GC regions

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Question 11

DNA is methylated at

A. AC sequences
B. TATA sequences
C. CAAT sequences
D. CG sequences

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Question 12

Alternate splicing of RNA transcripts is a mechanism to regulate

A. tubulin
B. tachykinins
C. DNA methylation
D. leucine zippers

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Question 13

Methylated gene are

A. active
B. silent
C. dynamic
D. either (a) or (b)

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Question 14

Sex determination in Drosophila involves

A. alternate splicing
B. methylation
C. gene amplification
D. none of these

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Question 15

Which of the following is not a transcription factor?

A. Helix-turn-helix proteins
B. Zinc finger proteins
C. Leucine zipper proteins
D. Steroid hormones

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Question 16

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

A. positive
B. negative
C. may be positive or negative
D. none of these

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Question 17

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

A. constitutive trp operon expression
B. inducible trp operon expression
C. no operon expression
D. none of the above

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Question 18

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

A. I
B. O
C. P
D. none of these

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Question 19

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

A. Early genes will not be translated
B. Middle genes will not be transcribed
C. The bacterial host will lyse immediately
D. Infection will proceed as usual

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Question 20

Sex lethal (sxl) in Drosophila is transcribed when

A. the X autosome balance is less than 0.5
B. the X autosome balance is 1 or greater
C. the X autosome balance equals 0.5
D. none of the above

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Question 21

Enhancers differ from promoters in that

A. they initiate transcription
B. they are adjacent to the start codon
C. their orientation can be inverted without effect
D. they are restricted to a specific gene

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Question 22

The first protein complex to bind to the TATA box is

A. transcription factor IIA
B. transcription factor IIB
C. transcription factor IID
D. all of these

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