Science (English Medium) Class 12 - CBSE Question Bank Solutions for Biology

DNA is a polymer of nucleotides which are linked to each other by 3’-5’ phosphodiester bond. To prevent polymerisation of nucleotides, which of the following modifications would you choose?

Genetic code is ______.

Frame shift mutation occurs when ______.

Khorana first deciphered the triplet codons of ______.

Because most of the amino acids are represented by more than one codon, the genetic code is ______.

The number of base substitution possible in amino acid codons is ______.

Out of A=T, G =C pairing, bases of DNA may exist in alternate valency state owing to arrangement called ______.

The change of the light coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonarid) is due to ______.

H. J. Muller was awarded Nobel Prize for his ______.

Indentify the wrong statement regarding post-fertilisation development.

If the endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in the root tip cells will be ______.

The cells of endosperm have 24 chromosomes. What will be the number of chromosomes in the gametes?

Amino acids which are specified by single codons are ______.

Which out of the following statements is incorrect?

Some amino acids are coded by more than one codon, hence the genetic code is ______.

The mutations that involve addition, deletion or substitution of a single pair in a gene are referred to as ______.

Sickle cell anemia results from a single base substitution in a gene, thus it is an example of ______.

Select the incorrectly matched pair.

If the sequence of bases in coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be ______.

Mark the odd one.