Question

Riboswitches are folded RNAs that act as switches to turn protein synthesis on or off in response to ________. Select one: a. specific codes from the DNA b. specific tRNAs c. the presence or absence of ubiquitins d. changes in the environment

Answer 1

Answer:

The correct answer is - option d.  

Explanation:

A riboswitch is an mRNA segment that regulates the change in production of the proteins in the result of binding to a small molecule. In other words, these are folded RNA that regulates on and off the production of the protein synthesis like a switch so-called riboswitch.

This switching on and off the protein synthesis takes place in response to the change in the environment. These regulating segments control the gene expression at very different levels, transcription, translation, and splicing.

Thus, the correct answer is - option D.

Answer 2

Answer: D) changes in the environment

Explanation: Riboswitches are regulatory segments of a messenger RNA by binding small molecules. Riboswitches have two functional domains: The aptamer domain which which recognizes and binds the effector molecules and the expression platform which has a secondary structural switch that comes in contact with the translational machinery. They regulate protein synthesis through the overlapping region of the two domains that is called the switching sequence. The switch is controlled by changes in the environment.