Question

Which of the following concerning a bacterial operon is false?

1) May involve both positive and negative regulation
2) Controls transcription of a single mRNA
3) May interpret multiple inputs to produce single result
4) Only few examples have been observed
5) Synthesis of proteins involved in the utilization of nutrients often controlled by this mechanism

Answer 1

a bacterial operon is that only a few examples have been observed. Operons are a common regulatory mechanism in bacteria for coordinating gene expression, and many examples have been studied, including the well-known lac operon.

Step-by-step explanation:

a bacterial operon is that only a few examples have been observed (option 4). In fact, many operons have been identified in bacteria, and they are a widespread mechanism for gene regulation.

Operons may indeed involve both positive and negative regulation (option 1), control the transcription of a single mRNA that encodes multiple proteins (option 2), and interpret multiple inputs to produce a single coordinated response (option 3). Furthermore, the synthesis of proteins for the utilization of various nutrients is often controlled by this mechanism (option 5).

Operons are fundamental units of genetic regulation in prokaryotic organisms, in which genes encoding related proteins are transcribed together from one promoter. A classic example is the lac operon, which is responsible for lactose metabolism in E. coli and represents both inducible and repressible control systems, where the presence or absence of specific metabolites influences the transcription of the genes within the operon.