Carotenoid

... meantime, homozygous plant for the “yellow” allele would lack the green pigment and show the color of the next most abundant pigment – yellow (say carotenoid). Keep in mind that this is only one example. There is no universal mechanism for this. The key point is that alleles of the gene can differ ...

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I"ll give you a clue http://en.wikipedia.org/wiki/Carotenoid Introduction, paragraph 2 and Section 2 physiological effects should answer most of your question. From that you can explore deeper using pubmed and recent literature.

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How to calculate extinction coefficient of resistomycin For example,The total carotenoid (mg/L culture liquid) was calculated according to the following formula TC (mg/L) = ADV1/ 0.16V2 (1) where TC denotes the total catotenoid yield (mg/L culture liquid), A the ...

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carotenoid is antioxidant, protect the cells reseptor

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it's not carotene (which is red), but carotenoid (group of compounds)

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