Correct answer: (B) Monomeric GTPase involved in relaying signal from cell surface to nucleus.; (D) Monomeric GTPase involved in regulation of cytoskeleton.
Explanation
Classical Ras is a small monomeric GTPase. Its GDP/GTP switch relays receptor signals through pathways such as RAF–MEK–ERK to influence nuclear gene expression, supporting B. Ras-family signalling also intersects cytoskeletal regulation, and the appended official key accepts either B or D. These are alternative single-choice answers, not a requirement to choose both; the original grading is retained.
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