Describe briefly the following:(i) Transcription   (ii) Transla

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 Multiple Choice QuestionsShort Answer Type

161.

Which forces are responsible for the stability of α-helix? Why is it named as 3.6 helix?

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162.

Answer the following queries about proteins:
How are proteins related to amino acids?

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163.

Answer the following query about proteins:
How are oligopeptides different from polypeptides?

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164.

Answer the following query about proteins:
When is a protein said to be denatured?

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165.

What is mutation? What are the consequences of mutation?

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166.

Explain the role of RNA in protein synthesis in a cell.

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 Multiple Choice QuestionsLong Answer Type

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167.

Describe briefly the following:
(i) Transcription   (ii) Translation.


The genetic information coded in DNA in the form of specific base sequence has to be translated and expressed in the form of synthesis of specific proteins, which perform various functions in the cell. This is brought about in two steps called transcription and translation.

The transcription involves copying of DNA sequence into a complimentary RNA molecule called messenger RNA (m-RNA). The copying principle as in replication, but with the difference that the base A pairs with U in RNA.

During translation m-RNA directs protein synthesis in the cytoplasm of cell with the involvement of another type of RNA molecule called, transfer RNA (t-RNA) and the ribosomal particles.

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168. What reaction is involved in the formation of disaccharides from monosaccharides ? Give the chemical reaction.
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169.

Define the following terms: (i) Gene, (ii) Genetic code, (iii) Transcription, (iv) Translation, (v) Codon.

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 Multiple Choice QuestionsShort Answer Type

170.

List three functions of the nucleotides in a cell.

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