AP BIOLOGY

HEREDITY

MUTATIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
what is an operon?
A
a part of a ribosome
B
a part of a Rna
C
a unit made up of linked genes that code for proteins needed to do a specific task
D
needed for dna replication
Explanation: 

Detailed explanation-1: -An operon is a cluster of genes that are transcribed together to give a single messenger RNA (mRNA) molecule, which therefore encodes multiple proteins (Fig. 16.11). Such polycistronic mRNA is typically found in prokaryotes.

Detailed explanation-2: -A typical operon consists of a group of structural genes that code for enzymes involved in a metabolic pathway, such as the biosynthesis of an amino acid.

Detailed explanation-3: -An operon is the structure of a cluster of genes in the genome of an organism. The operons are comprised of many genes which encode for different proteins or products. The polycistronic mRNAis synthesized from which many polypeptides can be produced.

Detailed explanation-4: -Operons allow related proteins to be transcribed and translated together, which helps to promote a coordinated response. For example, the lac operon contains all the proteins required for lactose metabolism in bacteria. Having them on the same mRNA transcripts ensures they are all available when needed.

Detailed explanation-5: -Bacterial Operons Are Coregulated Gene Clusters The best-studied examples of operons are from the bacterium Escherichia coli (E. coli), and they involve the enzymes of lactose metabolism and tryptophan biosynthesis.

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