How many types of nitrogenous bases are present in nucleic acid

1. 4

2. 3

3. 5

4. 6

Distance between two consecutive nucleotide pairs of DNA is

1.0.34nm

2.34angstrom

3.3.4 micrometre

4.34nm

If there are 10,000 nitrogenous base pairs in a DNA then how many nucleotides are there

(1)500

(2)10,000

(3)20,000

(4)40,000

If there are 10,000 nitrogenous base pairs in B-DNA then its length will be

(1)340nm

(2)3400nm

(3)34000nm

(4)340000nm

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