Final Answer:
Eukaryotic cells, represented by option b), exhibit prevalent protein-protein interactions for transcription.
Step-by-step explanation:
Transcription, the process of synthesizing RNA from DNA, involves a complex interplay of proteins and their interactions. Eukaryotic cells, characterized by membrane-bound organelles and a nucleus, possess a highly organized transcriptional machinery. In eukaryotes, transcription occurs in the nucleus, where RNA polymerase, transcription factors, and other regulatory proteins engage in intricate protein-protein interactions to modulate gene expression. This complexity allows for precise control and regulation of transcription. Prokaryotic cells (option a), lacking a distinct nucleus, exhibit a simpler transcriptional apparatus, and although they involve protein interactions, the processes are generally less intricate. Therefore, eukaryotic cells, found in both plant cells (option c) and animal cells (option d), prominently feature prevalent protein-protein interactions for transcription.
Option b) Eukaryotic cells is the answer.