Cryptochrome signaling requires which structural feature absent in photolyase?
Pick B: C-terminal extension. Thinking through cryptochrome step by step rules out the lookalikes and leaves C-terminal extension. Skip these: A) PHR domain; C) FAD-binding site; D) Dimerization site. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.