Explore topic-wise MCQs in Cytogenetics.

This section includes 9 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 a mero-diploid you have one I- and one I+ Repressor gene in the two lac operons. I+ is wild type while I- is a mutant which produces a repressor that doesn’t bind. What would be the functionality of the diploid?

A. Function normally
B. Will be non-functional
C. May or may not function
D. Will have impaired functioning
Answer» B. Will be non-functional
Discussion
2.

Which of the Ara promoter regulation is controlled by binding of repressors on the O1 regulating unit?

A. P<sup>A</sup>
B. P<sup>B</sup>
C. P<sup>C </sup>
D. P<sup>D</sup>
Answer» D. P<sup>D</sup>
Discussion
3.

In which of this condition is Ara operon functional?

A. When repressor binds to O2 and I1
B. When repressor binds to O1 and I2
C. When repressor binds to I2 and I1
D. When repressor binds to O2 and Pc
Answer» D. When repressor binds to O2 and Pc
Discussion
4.

Which of these Ara genes is a mode of feedback autoregulation?

A. Ara A
B. Ara B
C. Ara C
D. Ara D
Answer» D. Ara D
Discussion
5.

Which of the Ars operon regulation site is actually preventing RNA polymerase from binding and producing the Ara genes BAD?

A. O1
B. O2
C. P
D. Z
Answer» C. P
Discussion
6.

Which of these combinations will result is am operon that can never produce beta galactosidse?

A. I<sup>–</sup> + P + O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
B. I<sup>+</sup> + P + O<sup>C</sup> + Z<sup>–</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>+</sup> + Z<sup>–</sup> + Y<sup>+</sup> + A<sup>+</sup>
C. I<sup>s</sup> + P + O<sup>C</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>C</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
D. I<sup>-d</sup> + P + O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>–</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
Answer» C. I<sup>s</sup> + P + O<sup>C</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>C</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
Discussion
7.

Which of these Lac operon mero- diploid will be constitutively turned on? Considering the terms has their usual meaning.

A. I<sup>+</sup> + P + O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
B. I<sup>+</sup> + P + O<sup>C</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
C. I<sup>s</sup> + P + O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
D. I<sup>+</sup> + P + O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>–</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
Answer» C. I<sup>s</sup> + P + O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup> / I<sup>+</sup> + P+ O<sup>+</sup> + Z<sup>+</sup> + Y<sup>+</sup> + A<sup>+</sup>
Discussion
8.

In a mero-diploid you have one I- and one I+ Repressor gene in the two lac operons. I+ is wild type while I- is a mutant which produces a repressor that doesn’t bind. What would be the functionality of the diploid?$

A. Function normally
B. Will be non-functional
C. May or may not function
D. Will have impaired functioning
Answer» B. Will be non-functional
Discussion
9.

You want your bacterial culture to grow well so you made an enriched media with all forms of carbohydrates. Which of this carbohydrate should you restore first if you want the culture to keep growing at the same rate?

A. Glucose
B. Lactose
C. Galactose
D. Fructose
Answer» B. Lactose
Discussion