Final answer:
The SH3 domain is indeed found on adaptor proteins that are involved in signal transduction following RTK activation, facilitating the recruitment of other proteins to the signaling complex.
Step-by-step explanation:
The statement that the SH3 domain can be found on adaptor proteins that recruit other signal transduction proteins following the activation of a receptor tyrosine kinase (RTK) is true. The SH3 domain is known to play a key role in the assembly of protein complexes that are critical for signal transduction pathways.
Following the activation of an RTK, these domains can bind to proline-rich sequences in other proteins, which facilitates the recruitment of these signal transduction proteins to the receptor complex. This process is vital for the transmission of signals from the cell surface to the interior, ultimately resulting in a cellular response, such as gene regulation or cell proliferation.