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What Are Homologous Chromosomes?

What is opero...

Question

What is operon?

A

A set of closely linked genes regulating a metabolic pathways in prokaryotes.

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B

The sequence of three nitrogen bases determining a single amino acid.

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C

The sequence of nitrogen bases in mRNA which codes for a single amino acid.

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D

A gene responsible for switching on or off other genes.

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E

A segment of DNA specifying one polypeptide chain in protein synthesis.

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Solution

The correct option is A A set of closely linked genes regulating a metabolic pathways in prokaryotes.
An operon is made up of several structural genes arranged under a common promoter and regulated by a common operator.
For example - Lac operon is a operon that is required for the transport and metabolism of lactose in E.coli.

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Q. As we know, a code of three nitrogen bases is responsible for specifying one amino acid. In an ideal case, how many nitrogen bases would be present on a messenger RNA that transcribes a polypeptide containing 57 amino acids?

Q. Choose the correct answer from the alternatives given :
Read the following statements.
(i) One codon codes for only one amino acid.
(ii) Some amino acids are coded by more than one codon.
(iii) The, sequence of triplet nitrogenous bases in DNA or mRNA corresponds to the amino acid sequence in the polypeptide chain.
Give suitable terms for the characteristics of genetic code as per the above statements.

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