set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is known as specific molecular scissors?

a) Restriction endonuclease

b) Ligase

c) Helicase

d) DNA polymerase

Question : 2

Who has proposed for the first time the double helix model of DNA?

a) Lamark and Darwin

b) Watson and Crick

c) Fisher and Haldoni

d) Hugo de Vries

Question : 3

The American multinational company, Monsanto, has produced an insect-resistant cotton variety that is undergoing field trials in India. A toxin gene from which one of the following bacteria has been transferred to this transgenic cotton?

a) Bacillus amyloliquifaciens

b) Bacillus subtilis

c) Bacillus thuringiensis

d) Bacillus globlii

Question : 4

Assertion (A) :
In human beings, the female play a major role in determining the sex of the offspring.
Reason (R) :
Women have two X-chromosomes.

a) A is true, but R is false

b) Both A and R are true and R is the correct explanation of A

c) Both A and R are true, but R is not a correct explanation of A

d) A is false, but R is true

Question : 5

Generally, Orobanche weed is found in

a) Rice field

b) Tobacco field

c) Gram field

d) Wheat field

Question : 6

At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us?

1. It is possible to know the pedigree of livestock.
2. It is possible to understand the causes of all human diseases.
3. It is possible to develop diseaseresistant animal breeds.

a) 1 and 3

b) 1 and 2

c) Only 2

d) 1, 2 and 3