The question asks to define the Ras protein based on its structure and function.

Ras Protein Classification

Ras proteins are known to be small, monomeric GTPases. This distinguishes them from larger, heterotrimeric G proteins.

Ras Protein Function

Ras proteins play a crucial role in intracellular signal transduction. They act as molecular switches:

• When activated (bound to GTP), they relay signals from cell surface receptors.
• These signals are transmitted downstream, often towards the nucleus, influencing processes like cell growth and differentiation.
• This function involves relaying signals from the cell surface to the nucleus.

Therefore, Ras protein is a monomeric GTPase involved in relaying signals from the cell surface to the nucleus.