What is a key difference between GPCRs and RTKs?

• A. GPCRs associate with G proteins, while RTKs involve receptor dimerization.
• B. GPCRs are activated by light, while RTKs are activated by mechanical touch.
• C. GPCRs are found in the cytoplasm, while RTKs are membrane-bound.
• D. GPCRs use lipid hormones, while RTKs use protein hormones.

Answer: (A)