Explore topic-wise MCQs in Cytogenetics.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Cytogenetics knowledge and support exam preparation. Choose a topic below to get started.

1.

In which microorganism will you find attenuation by alternate loop formation due to ribosomal stalling?

A. S. aureus
B. E. coli
C. S. typhimurium
D. B. subtlis
Answer» E.
Discussion
2.

Which of this mode of trp regulation is not possible in eukaryotes?

A. Anti-TRAP Trp-TRAP
B. Anti-Terminator stabilization
C. Attenuation of trp
D. Trp-TRAP binding
Answer» D. Trp-TRAP binding
Discussion
3.

How many stem loop structures play important role in complete system of tryptophan gene regulation?

A. 3
B. 4
C. 6
D. 8
Answer» D. 8
Discussion
4.

When uncharged tRNA concentration is low what will you expect as the activity of tryptophan operon?

A. Low
B. Medium
C. High
D. Very high
Answer» E.
Discussion
5.

We know that lactose has a positive impact on the activity of the lac operon. Tryptophan’s presence has a ________________

A. Positive feedback
B. Negative feedback
C. No difference
D. Highly positive impact
Answer» C. No difference
Discussion
6.

WHEN_UNCHARGED_TRNA_CONCENTRATION_IS_LOW_WHAT_WILL_YOU_EXPECT_AS_THE_ACTIVITY_OF_TRYPTOPHAN_OPERON??$

A. Low
B. Medium
C. High
D. Very high
Answer» E.
Discussion
7.

Which of this mode of trp regulation is not possible in eukaryotes?$

A. Anti-TRAP Trp-TRAP
B. Anti-Terminator stabilization
C. Attenuation of trp
D. Trp-TRAP binding
Answer» D. Trp-TRAP binding
Discussion
8.

How_many_stem_loop_structures_play_important_role_in_complete_system_of_tryptophan_gene_regulation?$

A. 3
B. 4
C. 6
D. 8
Answer» D. 8
Discussion
9.

Which operon behaves similar to Bacillus subtilis trp operon in terms of attenuation?

A. Lac operon
B. His operon
C. Phe operon
D. Ara operon
Answer» C. Phe operon
Discussion
10.

In_which_microorganism_will_you_find_attenuation_by_alternate_loop_formation_due_to_ribosomal_stalling?

A. S. aureus
B. E. coli
C. S. typhimurium
D. B. subtlis
Answer» E.
Discussion
11.

Which of these items have a positive impact on PEDCBA transcription?

A. Trp-TRAP
B. Trp-ANTI TRAP
C. Anti-Trp with TRAP
D. Anti-Trp with Trp-TRAP
Answer» E.
Discussion
12.

If in an experiment you mutate the two trp codons in the attenuator to ala codon what will be the impact on repression?

A. Repression will be normal
B. Reduced repression
C. No repression so the gene would be constitutively turned on
D. Activation will take place
Answer» C. No repression so the gene would be constitutively turned on
Discussion
13.

We know that lactose has a positive impact on the activity of the lac operon. Tryptophan’s presence has a ________________$

A. Positive feedback
B. Negative feedback
C. No difference
D. Highly positive impact
Answer» C. No difference
Discussion
14.

Which segments of the attenuator together form the repression loop?

A. Segment 1-2
B. Segment 2-3
C. Segment 3-4
D. Segment 1-4
Answer» C. Segment 3-4
Discussion
15.

Which of these properties do not agree with trp operon attenuator?

A. It brings about repression of trp operon
B. It consists of one stem loop system
C. It has two codons for tryptophan in sequence
D. Ribosome stalls at the attenuator
Answer» C. It has two codons for tryptophan in sequence
Discussion
16.

A Lac repressor is a tetramer repressed when bound to the inducer. The trp repressor is a ____________________

A. Dimer inactivated when bound to the inducer
B. Dimer activated on inducer binding
C. Tetramer inactivated on inducer binding
D. Tetramer activated on inducer binding
Answer» C. Tetramer inactivated on inducer binding
Discussion
17.

Which of these systems give the best mode for turning trp operon off?

A. Repressor
B. Attenuator
C. Repressor with a downstream poly A tail
D. Repressor with an attenuator
Answer» E.
Discussion
18.

Which of these operons is anabolic?

A. Lac
B. Ara
C. Trp
D. Phe
Answer» D. Phe
Discussion