62. A crystal is said to be face centred when one extra atom (or molecule) lies at en centre of:
(a)Two sides
(b) Four sides
(c)Each of the six faces of the cube
(d) The cube
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NUCLEIC ACIDS: Nucleic acids are
polymers of nucleotides and are
macromolecules. These are two types of
nucleic acids namely – deoxyribonucleic
acid (DNA) or ribonucleic acid (RNA).
Nucleotide serves as the building block of
nucleic acid.
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