Explore topic-wise MCQs in Microbiology.

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

1.

How much time is required to inject a copy of the whole Hfr E.coli genome?

A. 24 hrs
B. 30 mins
C. 100 mins
D. 48 hrs
Answer» D. 48 hrs
Discussion
2.

The Hfr chromosome is transferred to the F— cell in a _____________ fashion.

A. circular
B. coiled
C. dimer
D. linear
Answer» E.
Discussion
3.

Which of the following can be used as a measure to construct a linkage map of the Hfr chromosome?

A. frequency of recombination
B. time of entry
C. locus of mutation
D. transfer of F factor
Answer» C. locus of mutation
Discussion
4.

Which of the following is true for an Hfr X F— cross?

A. frequency of recombination high, transfer of F factor low
B. frequency of recombination high, transfer of F factor high
C. frequency of recombination low, transfer of F factor high
D. frequency of recombination low, transfer of F factor low
Answer» B. frequency of recombination high, transfer of F factor high
Discussion
5.

What is the frequency of formation of recombinants in a F+ X F— cross?

A. 100
B. 40
C. 10
D. 1
Answer» E.
Discussion
6.

Which of the following cells of E.coli are referred to as F—

A. Male cells
B. Female cells
C. Both male and female cells
D. Neither male nor female cells
Answer» C. Both male and female cells
Discussion
7.

WHICH_OF_THE_FOLLOWING_IS_TRUE_FOR_AN_HFR_X_F‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ√Ü_CROSS??$#

A. frequency of recombination high,transfer of F factor low
B. frequency of recombination high,transfer of F factor high
C. frequency of recombination low,transfer of F factor high
D. frequency of recombination low,transfer of F factor low
Answer» B. frequency of recombination high,transfer of F factor high
Discussion
8.

The Hfr chromosome is transferred to the F— cell in a _____________ fashion.$#

A. circular
B. coiled
C. dimer
D. linear
Answer» E.
Discussion
9.

Which_of_the_following_can_be_used_as_a_measure_to_construct_a_linkage_map_of_the_Hfr_chromosome?$

A. frequency of recombination
B. time of entry
C. locus of mutation
D. transfer of F factor
Answer» C. locus of mutation
Discussion
10.

How_much_time_is_required_to_inject_a_copy_of_the_whole_Hfr_E.coli_genome?

A. 24 hrs
B. 30 mins
C. 100 mins
D. 48 hrs
Answer» D. 48 hrs
Discussion
11.

The F factor DNA is sufficient to specify how many genes?

A. 2
B. 10
C. 40
D. 100
Answer» D. 100
Discussion
12.

What is the frequency of formation of recombinants in a F+ X F— cross?$

A. 100
B. 40
C. 10
D. 1
Answer» E.
Discussion
13.

Which of the following cells of E.coli are referred to as F—?$

A. Male cells
B. Female cells
C. Both male and female cells
D. Neither male nor female cells
Answer» C. Both male and female cells
Discussion
14.

What is the shape of DNA in the male cells of E.coli?

A. linear
B. supercoiled
C. circular
D. relaxed
Answer» D. relaxed
Discussion
15.

In conjugation only small fragments of the bacterial chromosome are transferred.

A. True
B. False
Answer» C.
Discussion
16.

Which type of E.coli strain was chosen to prove the experiment of conjugation?

A. prototrophs
B. auxotrophs
C. polyauxotrophs
D. autotrophs
Answer» D. autotrophs
Discussion
17.

Mating between species is necessary for recombination to take place.

A. True
B. False
Answer» B. False
Discussion
18.

The first demonstration of recombination in bacteria was achieved by _______________

A. Lederberg and Tatum
B. Luria and Delbruck
C. Joshua and Lederberg
D. Luria and Tatum
Answer» B. Luria and Delbruck
Discussion