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
D.
the proportion of adenine in relation to thymine varies with organism
In DNA molecule the adjacent deoxyribonucleotides are joined in a chain by phosphodiester bridges or bonds, which link the 5' carbon of deoxyribose of one mononucleotide unit with 3' carbon of deoxyribose of next mononucleotide unit, According to Waston and Crick DNA molecule consists of two such polynucleotide chains wrapped helically around each other, with the sugar-phosphate chain on the outside and purine and pyrimidine on the inside of helix. Two strands run antiparallel, ie, one strand have phosphodiester linkage in 3'→5' direction while another strand has phosphodiester linkage in 5' →3' direction.
Chargaff (1950) suggested that despite wide compositional variations exhibited by different types of DNA the total amount of purines equalled the total amount of purines equaled the total amount of pyrimidines (A + G = T + C)
What is antissense technology?
A cell displaying a foreign antigen used for synthesis of antigens
Production of somaclonal variants in tissue cultures.
When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.
When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.
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
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
Thymine, Uracil - Pyrimidines
Uracil, Cytosine - Pyrimidines
Guanine, Adenine - Purines
Guanine, Adenine - Purines
Cry-I endotoxins obtained from Bacillus thringiensis are effective against
mosquitoes
flies
nematodes
nematodes
