Question

GTP serves as:

a. an allosteric regulator of GTP binding proteins
b. precursor of cGMP
c. precursor RNA
d. all of the above

Answer 1

GTP serves multiple roles in the cell: it is an allosteric regulator for GTP-binding proteins, a precursor to cGMP, and a precursor for RNA, making the correct answer 'd. all of the above'.

Step-by-step explanation:

Guanosine triphosphate (GTP) serves several functions within the cell:

• It acts as an allosteric regulator of GTP-binding proteins. Similar to how ATP can act as an allosteric regulator for certain enzymes, GTP can bind to proteins and change their shape, which affects their activity levels.
• GTP is a precursor of cGMP. cGMP is a secondary messenger in many signal transduction pathways, and it is synthesized from GTP by the enzyme guanylyl cyclase.
• It also serves as a precursor for the synthesis of RNA during the process of transcription. GTP provides the guanine nucleotide for RNA chains as they are assembled.

In conclusion, the functions of GTP include acting as an allosteric regulator, a precursor to cGMP, and a precursor for RNA synthesis. Thus, the correct answer to the question is d. all of the above.