Answer:
a: True
Explanation:
Riboswitches are regulatory segments of mRNA which are capable of controlling/regulating gene expression simply by binding to small molecules. They are divided into two parts;
- The aptamer is the part that directly binds to small molecules
- The expression platform is the part that changes structure in response to binding of aptamer to small molecules. This is the part that primarily controls gene expression by turning on/off relevant genes.
The correct option is a, true.