1. You perform interrupted-mating experiments on three Hfr strains (A, B, and C)

Question

1. You perform interrupted-mating experiments on three Hfr strains (A, B, and C). Genes are transferred (from last to first) in the following order from each strain: strain A, thi-his-gal-lac-pro; strain B, azi-leu-thr-thi-his; strain C, lac-gal-his-thi-thr. How are the F factors in these strains oriented?

Select one:

a. A and B are oriented in the same direction.

b. B and C are oriented in the same direction.

c. All of them are oriented in the same direction.

d. A and C are oriented in the same direction.

e. It cannot be determined from the information given.

2. Which of the following statements about retroviruses is false?

Select one:

a. All retroviruses contain gag genes whose product forms the viral protein coat.

b. Not all RNA viruses are retroviruses.

c. All retroviruses contain oncogenes, which can induce the formation of tumors.

d. All retroviruses require pol genes, which are critical for retrotranscription.

e. All retroviral genomes have gag, pol, and env genes.

3. Which of the following facts would NOT be considered as an advantage for using bacteria and viruses for genetic studies?

Select one:

a. Low cost to maintain and little storage space required

b. Rapid reproduction and high progeny number

c. Genomes being small and readily subjected to genetic manipulation

d. Complete absence of recombination, which maintains the integrity of genome

e. Haploid genome for expressing mutations

Explanation / Answer

amswer1:- A and B are oriented in the same direction, because A is the continuation of B

answer 2 c, all doesnot causes cancer some may cause AIDS which is a immunodeficiency disprder not a cancer

answer3:- recombination is present in bacteria by transformation,transduction and conjugation.

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