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Highest level of structural organisation present in Keratin of hair is
(a)Tertiary structure of protein
(b)-helical structure of protein
(c)-pleated structure
(d)Primary structure of protein

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Important Questions on Chemical Constituents of Living Cells
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Casein of milk is

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The backbone of a nucleic acid strand is made up of

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Which of the following is not present in DNA?

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What should be added to a nucleoside to yield a nucleotide?

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Which of the following RNA is a carrier that delivers the correct amino acid for protein synthesis?

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The two strands of DNA are coiled around

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The two strands of DNA are held together by bonds of

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The given amino acid is _____ in nature
