The human chromosome with the highest and least number of genes in them are respectively
chromosome 21 and Y
chromosome 1 and X
chromosome 1 and Y
chromosome $X$ and $Y$
Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?
Rosalind Franklin
Maurice Wilkins
Erwin Chargaff
Meselson and Stahl
DNA is a polymer of nucleotides which are linked to each other by $3^{\prime}-5^{\prime}$ phosphodiester bond. To prevent polymerisation of nucleotides, which of the following modifications would you choose?
Replace purine with pyrimindines
Remove/Replace 3' OH group in deoxy ribose
Remove/Replace 2' OH group with some other group in deoxy ribose
Both (b) and (c)
Discontinuous synthesis of DNA occurs in one strand, because
DNA molecule being synthesised is very long
DNA dependent DNA polymerase catalyses polymerisation only in one direction ( $5^{\prime} \rightarrow 3^{\prime}$ )
it is a more efficient process
DNA ligase has to have a role
Which of the following steps in transcription is catalysed by RNA polymerse?
Initiation
Elongation
Termination
All of these