First slide
The DNA
Question

Which of the following statements is correct?

Easy
Solution

When a phosphate group is linked to OH of 5' C of a nucleoside through phosphoester linkage, a corresponding nucleotide (or deoxynucleotide depending upon the type of sugar present) is formed. Two nucleotides are linked through 3'-5' phosphodiester linkage to form a dinucleotide. Two nucleotides are linked through 3'-5' phosphodiester linkage to form a dinucleotide. 

Francis Crick proposed the Central dogma in molecular biology.

The pitch of the helix is 3.4 nm.
The ratios between Adenine and Thymine, and Guanine and Cytosine are constant and equals one.
 

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