Differentiation of organs and tissues in a developing organism, is associated with:

(1) developmental mutations

(2) differential expression of genes

(3) lethal mutations

(4) deletion of gens

Amino acid sequence, in protein synthesis is decided by the sequence of

(1) t-RNA

(2) m-RNA

(3) c-DNA

(4) r-RNA

One turn of the helix in a B-form DNA is approximately:

(1) 20 nm

(2) 0.34 nm

(3) 3.4 nm

(4) 2 nm

Antiparallel strands of a DNA molecule means that:

(1) one strand turns anti-clockwise

(2) the phosphate groups of two DNA strands, at their ends, share the same position

(3) the phosphate groups at the start of two DNA strands are in opposite position (pole)

(4) one strand turns clockwise

Complete genomic sequence of the following plant has been recently announced is

(1) Arabidopsis thaliana

(2) Tritium vulgare

(3) Cucurbita pepo

(4) Pisum sativum

Transcription in case of eukaryotes takes place in

(1) nucleus

(2) nucleolus

(3) cytoplasm

(4) ribosome

Which of the following is nonsense codon?

(1) UAG

(2) UAA

(3) UGA

(4) all the above

Frameshift mutation occurs when

(1) base is substituted

(2) base is deleted or added

(3) anticodons are absent

(4) none of these

What is true about tRNA?

(1) It binds with an amino acid at it 3’ end

(2) It has five double stranded regions

(3) It has a codon at one end which recognizes the anticodon on messenger RNA

(4) It looks like clover leaf in the three dimensional structure.

Which one of the following codons codes for the same information as UGC?

(1) UGU

(2) UGA

(3) UAG

(4) UGG