1.

Enumerate any four functions of blood.

Answer»

Solution :(a) DNA is a polynucleotide. Each nucleotide CONTAINS
(i) A sugar MOLECULE - Deoxyribose sugar
(ii) A NITROGENOUS base. They are two types of nitrogeneous bases. They are
1. Purines (Adenine and Guanine) `""` 2. Pyrimidines (Cytosine and Thymine)
(iii) A phosphate group
Nucleoside = Nitrogen base + sugar
Nucleotide = Nucleotide + Phosphate
Purines and Pyrimidines are linked by hydrogen bonds.
Adenine (A) links thymine (T) with two hydrogen bonds (A = T)
Cytosine (C) links Guanine (G) with three hydrogen bonds `(C equiv G)`
(b) Functions of BLOOD:
(i) Transport of respiratory gases (Oxygen and `CO_(2)`).
(ii) Transport of hormones.
(iii) It maintains proper water BALANCE in the body.
(iv) It acts as buffer and also helps in regulation of pH and body temperature.


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