Many nucleotides are joined to one another by phosphodiester bonds to form :
Nucleocide.
Histones.
Amino acides.
Poly nucleotide.
The double helical structure of DNA was discovered by
James Watson
Francis crick
Both a and b
Maurice Nil kins
The length of DNA double helix in a typical mammalian cell is
2.5
3.8
2.2
2.8
The t RNA occurs in the __________.
Nucleus
Cell wall
Cyto plasm
The Phenomenon of the development of a new character in a bacterium by the direct absorption of genetic material is called :
Bacterial transformation.
Replication.
Transcription.
None of these.
In the lac operon, the structural genes are switched off when,
Repressors binds to the operator
Repressor binds to the regulator
Repressor binds to the inducer
Repressor binds to the Promoter
Which bacterial strains can cause pneumonia
R - Strains
S- strains
Both R and Strains
None of these
Three enzymes required to breakdown lactose into glucose and galactose are
- gulactodase, Phosphoglucose isomerace and transacetyluse
? - gulactodase,Phosphoglucose, isomerace and pyrophasphate
? - gulactodase, permeuse and Transacetyluse
Phosphoglucomutase,permease and glycogen synthetase
Which of the character is not applicable to t RNA ?
It is the smallest of the RNA
It acts as an adapter for amino acid
It is the largest of the RNAs
Replication occurs with in a small opening of the DNA helix refered as
leading strand
Okazaki fragment
lagging strand
Replication fork