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Q: A group of genes whose activity is coordinated by a DNA site is called:
  • A. cistron
  • B. operon
  • C. polysome
  • D. polypeptide
Correct Answer: Option B - The term 'operon' was first proposed in a short paper in the proceedings of the French Academy of Science in 1960. In Genetics, an operon is a functioning unit of DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm or undergo splicing to create monocistronic mRNAs that are translated separately, i.e. several strands of mRNA that each encode a single gene product. There are two types of operon–Inducible and Repressible operon. The operon consists of an operator, promoter, regulator and structural genes.
B. The term 'operon' was first proposed in a short paper in the proceedings of the French Academy of Science in 1960. In Genetics, an operon is a functioning unit of DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm or undergo splicing to create monocistronic mRNAs that are translated separately, i.e. several strands of mRNA that each encode a single gene product. There are two types of operon–Inducible and Repressible operon. The operon consists of an operator, promoter, regulator and structural genes.

Explanations:

The term 'operon' was first proposed in a short paper in the proceedings of the French Academy of Science in 1960. In Genetics, an operon is a functioning unit of DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm or undergo splicing to create monocistronic mRNAs that are translated separately, i.e. several strands of mRNA that each encode a single gene product. There are two types of operon–Inducible and Repressible operon. The operon consists of an operator, promoter, regulator and structural genes.