Answer: operon
Explanation:
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.
The answers are B and C because the other 2 are unhealthy
<h2>a) option is correct </h2>
Explanation:
The parasympathetic nervous system is a division of the autonomic nervous system that controls the internal body organs in resting state
- It is active all the time and promotes life by regulating the vital body functions, although the person is unconscious about all these processes
- The parasympathetic system also has two types of nerve fibers:
-
Pre-ganglionic nerve fibers: These nerve fibers originate from the central nervous system and terminate at the ganglia of the parasympathetic nervous system
- Post-ganglionic nerve fibers: They originate from the ganglia of the parasympathetic nervous system and terminate at the target organs, the post-ganglionic fibers are short in case of the parasympathetic system because the ganglia are present near the target organs
- There are different processes in the body that are under the control of parasympathetic nervous system, namely, blood pressure, heart rate, respiration, digestion and urination
