The first genetic material could be
protein
carbohydrates
DNA
RNA
With regard to mature $m R N A$ in eukaryotes
exons and introns do not appear in the mature RNA
exons appear but introns do not appear in the mature RNA
introns appear but exons do not appear in the mature RNA
both exons and introns appear in the mature RNA
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)