MCQ
Nucleic acids are polymer of:
- ANucleotides
- BNucleosides
- CAmino acids
- DNitrogen bases
Explanation:
Nucleic acids are long-chain polymers of nucleotides.
The nucleotides, in turn, are phosphoric acid esters of nucleosides which mainly consist of a nitrogenous base, sugar, and phosphate.
The nitrogenous base includes purines and pyrimidines while the sugar contains ribose and deoxyribose sugar. phosphate is formed of phosphoric acid.
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$(i)$ Excretion is performed by malphigian tubules.
$(ii)$ They absorb nitrogenous waste products and convert them into uric acid which is excreted out through hindgut.
$(iii)$ In addition, fat body, nephrocytes and urecose glands also help in excretion.