I have involvement in the
immune system
(ex: antibodies).
Its this carbohydrates,lipids,proteins,nucleic acids
Which one?

Plant cells have several structures not found in other eukaryotes. In particular, organelles called chloroplasts allow plants to capture the energy of the Sun in energy-rich molecules; cell walls allow plants to have rigid structures as varied as wood trunks and supple leaves; and vacuoles allow plant cells to change size.