The length of DNA double helix in a typical mammalian cell is
2.5
3.8
2.2
2.8
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
A structural gone in a lack operon which codes for B-glactosiduse.
A - gene
Z - gene
Y - gene
Both Z and Y gene
A nitrogenous base is linked to the pentose sugar through :
Phospho ester linkage.
N - glycosidic linkage.
N2 - glycosidic linkage.
None of these.
A Phosphate group is linked to 5` - OH of a nucleoside through what linkage ?
N- glycocidic linkage.
Phospho dieseter linkage.
Coding or expressed sequence are called
Exon
Introns
Replicon
Coding strand
How many nitrogenous - bases are present in both DNA and RNA ?
5
3
2
6
Feed back repression is explained by _________.
Lactose Catabolism
Tryptophan synthesis
Amino acid synthesis
None of these
The role of m-RNA in protein synthesis.
Provides template
Provides amino acids
Plays structural and catalytic role
All the genes regulating a metabolic reaction constitute.
Cistron
Anticodon
Exons
Operon
