Question

Which among the following is not a key component of signal transduction process?

• A. G protein coupled receptors
• B. Reverse transcriptase
• C. Second messengers
• D. Phosphorylation cascade

Hint:

Major components of signal transduction include \[ \boxed{ \text{Receptors} \rightarrow \text{Second Messengers} \rightarrow \text{Protein Kinases} \rightarrow \text{Cellular Response}. } \] Reverse transcriptase functions in reverse transcription, not signaling.

Answer 1

The Correct Option is B

Step 1: Recall the components of signal transduction. Signal transduction involves the transmission of extracellular signals into cellular responses through
• Cell surface receptors,
• Second messengers,
• Protein kinases and phosphorylation cascades.

Step 2: Identify the incorrect component. Reverse transcriptase is an enzyme that synthesizes DNA from an RNA template and is mainly found in retroviruses. It is not involved in cellular signal transduction. Hence, \[ \boxed{\text{Reverse transcriptase}} \] is the correct answer. Therefore, \[ \boxed{(B)} \] is the correct answer.