In the context of rtk signaling, ras is active when bound to:
a. mapk
b. gdp
c. gtp
d. sos

GTP.

Explanation:

Ras MAP kinase is an important cell signalling process that are important for cell survival, cell multiplication and cell proliferation. The phosphorylation at particular reside play important role in this signalling.

The binding of GDP with Ras indicates that Ras pathway is inactive. The exchange of GDP with GTP activates the Ras pathway and initiates the signalling cascades that further activates the MEK signalling. Hence, Ras is active when bound to GTP.

Thus, the correct answer is option (c).

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."