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

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

54.

Semiconservative replication of DNA was first demonstrated in

• Drosophila melanogaster

• Escherichia Coli

• Streptococcus pneumoniae

• Streptococcus pneumoniae

Transgenic plants are

• produced by a somatic embryo in an artificial medium

• generated by introducing foreign DNA into a cell and regenerating a plant from that cell

• Produced by protoplast fusion in the artificial medium

• Produced by protoplast fusion in the artificial medium

What is not true for genetic code?

• A condon in mRNA is read in a non-contiguous fashion

• It is nearly universal 

• It is degenerate

• It is degenerate

Given below is the diagram of a bacteriophage in which one of the options, all the four parts A, B, C and D are correct?

• A	B	C	D
  Tail fibres	Head	Sheath	Collar

• A	B	C	D
  Sheath	Collar	Head	Tail fibres

• A	B	C	D
  Head	Collar	Sheath	Tail fibres

• A	B	C	D
  Head	Collar	Sheath	Tail fibres

Gel electrophoresis is used for 

• cutting of DNA into fragments

• separation of DNA fragments according to their size

• construction of recombinant DNA by joining with cloning vectors

• construction of recombinant DNA by joining with cloning vectors

Polymase is formed by

• several ribosomes attached to a single mRNA

• many ribosomes attached to a strand of endoplasmic reticulum

• a ribosome with several subunits

• a ribosome with several subunits

In the DNA molecule

• the  total amount of purine nucleotides and pyrimidine nucleotides is not always equal

• there are two strands, which run parallel in the 5' →3' direction

• the proportion of adenine in relation to thymine varies with organism

• the proportion of adenine in relation to thymine varies with organism