Explore topic-wise MCQs in Cytogenetics.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Cytogenetics knowledge and support exam preparation. Choose a topic below to get started.

1.

You study the gene incorporation in recipient using HFR and get the following sequences-P-W-A-K, W-L-I-K, A-K-I-L, W-P-R-T-W-L. What is the order of the gene?

A. P-W-A-K-W-T-R-L-I
B. W-P-R-T-W-L-A-K-I
C. A-K-I-L-W-T-R-P-WD) W-A-K-I-L-P-R-T-W
Answer» D.
2.

For complete HFR to enter the recipient, how much time should the two bacterial cells be in contact?

A. 10 mins
B. 30 mins
C. 60 mins
D. 100 mins
Answer» E.
3.

In an experiment of determining the order of gene in bacteria we use HFR which is gal+, Lac+, Ara+ and His+. If the recipient is negative for all these genes, and we selectively choose Gal + and get the pattern-100 % recipients are Gal +30% are His+55% are Lac +And only 5% are Ara+What would be our inference?

A. Sequence of gene is Gal—Lac—His—Ara
B. As we are just selecting one gene we can’t tell the sequence
C. The HFR was incorporated between Gal and His only
D. The recipient selectively incorporated some genes
Answer» B. As we are just selecting one gene we can’t tell the sequence
4.

If genes enter the different F- cells from different HFRs in the order as shown- What is the order of the gene where columns are for different HFR and values denote time?

A. Azi, Lac, Gal, Ton
B. Lac, Gal, Azi, Ton
C. Gal, Lac, Ton, Azi
D. Tob, Azi, Lac, GalView Answer
Answer» C. Gal, Lac, Ton, Azi
5.

In and interrupted mating experiment, it is seem that the after 10 mins AziR gene in recipient, after 20 minuites there is appearance of tonR and after 15 mins the recipient is lac+ , but the recipient is almost never his+. Where in the genome is the ori of transfer?

A. Between AziR and TonR genes
B. Between TonR and Lac+
C. Between Lac+ and His+
D. Between His+ and AziR
Answer» E.
6.

Conjugation can’t take place between_________________

A. F- and F+
B. F’ and F-
C. HFR and F-
D. HFR and F+
Answer» E.
7.

For complete HFR to enter the recipient, how much time should the two bacterial cells be in contact?$

A. 10 mins
B. 30 mins
C. 60 mins
D. 100 mins
Answer» D. 100 mins
8.

In and interrupted mating experiment, it is seem that the after 10 mins AziR gene in recipient, after 20 minuites there is appearance of tonR and after 15 mins the recipient is lac+ , but the recipient is almost never his+. Where in the genome is the ori of transfer?

A. Between Azi<sup>R</sup> and Ton<sup>R</sup> genes
B. Between Ton<sup>R</sup> and Lac<sup>+</sup>
C. Between Lac<sup>+</sup> and His<sup>+</sup>
D. Between His<sup>+</sup> and Azi<sup>R</sup>
Answer» E.
9.

All the genes in the HFR that is transferred to the recipient cell before breakage of the conjugation channel is incorporated in the recipient genome. State whether it is true or false.

A. True
B. False
Answer» C.
10.

A HFR bacteria mates with an F- plasmid containing bacteria. What will be the type of bacteria after conjugation is complete?

A. F+
B. F-
C. F’
D. HFR
Answer» C. F‚Äö√Ñ√∂‚àö√ë‚àö¬•
11.

Which of the following can transfer the genes in bacterial nucleoid as well?

A. F- plasmid
B. R factor
C. F’ plasmid
D. HFR
Answer» E.
12.

Which gene in a plasmid is indispensible for it to participate in conjugation?

A. Pilli forming gene
B. Origin of replication
C. Sex determining gene
D. Origin of transfer
Answer» D. Origin of transfer
13.

In case of mixing his+ leu- strain with his- leu+ strain we can see that the auxotroph behaves as prototroph for these two genes. This is because of________________

A. One is synthesizing one amino acid and giving it to the other type
B. They fuse to form similar diploid bacteria
C. Both will have the same genetic composition at the end
D. They share the RNA by extracellular processes
Answer» D. They share the RNA by extracellular processes
14.

In an experiment you have met, bio, thr+ and leu + bacterial strain in test tube 1; and met+, bio+, thr and leu bacterial strain in other test tube 2. Which of the following will not comply with your experimental results?

A. Both the strains will grow in enriched media
B. 2nd strain will grow in met absent media
C. Mixture of two strains will grow in minimal media
D. 1<sup>st</sup> stain will not grow in leu absent media
Answer» E.
15.

Conjugation can’t take place between_________________

A. F- and F+
B. F’ and F-
C. HFR and F-
D. HFR and F+
Answer» E.