Science (English Medium) इयत्ता १२ - CBSE Question Bank Solutions for Biology

Answer the following question.
State the importance of a Genetic code in protein biosynthesis.

Differentiate between the genetic codes given below:
Unambiguous and Universal

Differentiate between the genetic codes given below:
Degenerate and Initiator

A diploid female plant and a tetraploid male plant are crossed. The ploidy of endosperm shall be ______.

In angiosperms, triple fusion is required for the formation of ______.

If an angiospermic male plant is diploid and female plant tetraploid, the ploidy level of endosperm will be ______.

The endosperm of gymnosperms is ______.

Double fertilization leading to initiation of endosperm in angiosperms require ______.

One of the following is true with respect to AUG.

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 ______.