Cytidine is a

(1)nucleoside

(2)nitrogen base

(3)nucleotide

(4)nucleic acid

In rRNA, thymine pairs with 

(1)adenine

(2)uracil

(3)both 1 and 2

(4)None of these

Which one of the following nucleotide sequences contains only 4 pyrimidine bases?

(1)UAGCGGUAA

(2)TGCCTAACG

(3)GATCAATGC

(4)GCUAGACAA

New strands of DNA are formed only in

(1)5’→3’ direction

(2)3’→5’ direction

(3)In both directions

(4)There is no specific polarity

Regulation of gene expression in eukaryotes cannot take place at

(1)primary transcript level

(2)splicing level

(3)transport of m-RNA from nucleus to cytoplasm

(4)replication level

In E.coli the conversion of lactose in galactose and glucose takes place by

(1)Beta-galactokinase

(2) Beta-guluctosidase

(3) Beta-galactosidase

(4) Beta-lactosidase

The conditions which regulate the expression of genes are

(1)Environmental

(2)Physiological

(3)Metabolic

(4)All of the above

The development and differentiation of embryo into adult organisms are result of

(1)chemical regulation of expression of several sets of genes

(2)Electrical and Chemical regulation of expression of several sets of genes

(3)coordinated regulation of expression of several sets of genes

(4)All of above

Regulation of gene expression in prokaryotes predominantly takes place at

(1)transcriptional

(2)translational level

(3)splicing gene

(4)transportation of m-RNA from cytoplasm to mesosomes

Promoter regions of lac operon can be accessed by

(1)RNA polymerase

(2)DNA polymerase

(3)Proteins

(4)All of these