71.

Which one of the following is commonly used in the transfer of foreign DNA into crops plants?

• Trichoderma hazianum

• Meloidogyne incognita

• Agrobacterium tumefaciens

• Agrobacterium tumefaciens

Removal of introns and joining the exons in a defined order in transcription unit is called

• splicing

• tailing

• transformation

• transformation

Whose experiments cracked the DNA  and discovered unequivocally that is genetic code is a triplet?

• Nirenberg and Mathaei

• Hershey and Chase

• Morgan and Sturtevant

• Morgan and Sturtevant

Seminal plasma in human is rich in 

• fructose, calcium and certain enzymes

• fructose and calcium but has no enzymes

• glucose and certain enzymes but has no calcium

• glucose and certain enzymes but has no calcium

Synapsis occurs between 

• a male and female gamete

• mRNA and ribosomes

• spindle fibres and centromere

• spindle fibres and centromere

select the incorrect statement from the following 

• Linkage is an exception to the principle of independent assortment in heredity

• galactosemia is an inborn error of metabolism

• small population size results in a random genetic drift in a population

• small population size results in a random genetic drift in a population

Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?

• Phytoplankton 

• Fish

• Zoonplankton

• Zoonplankton

Use of antihistamines and steroids give a quick relief from

• allergy 

• nausea

• cough

• cough

Which one is the wrong pairing for the disease and its causal organism?

• Late blight of potato - Alternaria solani

• Black rust of wheat - puccinia graminis

• Loose smut of wheat - Ustilago nuda

• Loose smut of wheat - Ustilago nuda

What is true about Bt toxin

• The inactive protoxin gets converted into active form in the insect gut

• Bt protein exists as active toxin in the bacillus

• The activated toxin enters the ovaries of the pets to sterilise it and thus prevent its multiplication

• The activated toxin enters the ovaries of the pets to sterilise it and thus prevent its multiplication