Direction (11 - 15): Nucleic acids are the polymers of nucleotides which in turn consist of a base, a pentose sugar and phosphate moiety. Nucleic acids are responsible for the transfer of characters from parents of offsprings. There are two types of nucleic acids - DNA and RNA. DNA contains a five carbon sugar molecule called 2-deoxyribose whereas RNA contains ribose. Both DNA and RNA contain adenine, guanine and cytosine. The fourth base is thymine in DNA and uracil in RNA. The structure of DNA is a double strand whereas RNA is a single strand molecule. DNA is the chemical basis of heredity and have the coded message for proteins to be synthesised in the cell. There are three types of RNA - mRNA, rRNA and tRNA which actually carry out the protein synthesis in the cell. |
(Source : N.C.E.R.T. book, Class XII) |
A) r-RNA
B) t-RNA
C) m-RNA
D) All the three
Correct Answer: C
Solution :
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