Molecular Basis...

DNA is made of two chains that twist about one another in the shape of a

DNA generally acts as a template for the synthesis of

Dr. Khorana and his collegues synthesised a RNA molecule with repeating sequence of UGN bases (UG UG UG UG UG UG). It produced a tetrapeptide with alternating sequence of cysteine and valine. 

It proves that codons for cysteine and valine are

Directions: The following question has four choices out of which ONLY ONE is correct.

The genetic codes representing amino acid valine are

In DNA, two nucleotides are linked by

Name the conjugated protein used as genetic material in living cells

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

Genetic information is carried out by long chain molecule made up of

Select the wrong statements about genes.

A. Genes are arranged in a linear fashion on the chromosomes.
B. Genes cannot be replicated and inherited to the progeny.
C. Genes do not carry all the necessary information for the progeny.
D. Genes are susceptible to mutations.
E. All dominant genes give positive changes in phenotypes.

Haploid chromosome number is 10. What will be its monosomy?

Brett's syndrome is a rare form of mental retardation that can be more or less severe depending on the gender of the parent from whom it is inherited. This unusual kind of inheritance pattern is known as

The number of nucleotides in the gene which code for dystrophin protein is

Directions: The following question has four choices out of which ONLY ONE is correct.

The 'Cri-du-chat' syndrome is caused by change in chromosome structure involving

In E. coli lac-operon, an operator gene combines with

There is no DNA in

Teminism is a phenomenon which refers to

Proof reading enzyme during the synthesis of new bacterial DNA from template DNA is

In sickle cell anaemia due to point mutation, the sixth amino acid, glutamic acid in beta chain of haemoglobin is replaced by

Which enzyme catalyses the synthesis of DNA from RNA?

By which bonds the purine & pyrimidine pairs of Complementary Strands of DNA held together?