How does the tetrapyrrole structure of phycobilins differ from the porphyrin ring in chlorophyll?

• A. Phycobilins have a linear tetrapyrrole structure, while chlorophyll has a ring form.
• B. Phycobilins have a single pyrrole ring, while chlorophyll has multiple rings.
• C. Phycobilins have a ring structure, while chlorophyll has a linear form.
• D. Both have identical ring structures.

Answer: (A)