BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Generally, pigments are not proteins, although they may exist in a protein complex in photosynthetic microorganisms, as you have pointed out in case of phycobiliprotein and phycocyanin.

Detailed explanation-2: -The cells make proteins that build pink pigments. In nectar guide cells, transcription factors activate genes in the carotenoid biosynthetic pathway. Proteins are made that build yellow pigments.

Detailed explanation-3: -Pigments are defined as the set of compounds that have an intense colour and are used in the colouring of other materials. These colouring substances are also called Biological Pigments or the Biochromes, which mainly refers to the true pigments.

Detailed explanation-4: -The major groups of photosynthetic pigments are: Chlorophyll. Carotenoids. Phycobilins.

Detailed explanation-5: -Plant pigments are classified into four main categories: chlorophylls, anthocyanins, carotenoids, and betalains.