Proteins, Ribonucleic acid is another kind of organic molecule that also acts as a catalyst for chemical reactions. Asides acting a catalyst for chemical reactions, proteins have a wide variety of functions that they perform in in living cells.
Tryptophan self-controls its synthesis. If we have a large amount of tryptophan in the sense that it exceeds, tryptophan would act as a co-repressor which prevents synthesis of more enzymes for its production. Hope this answers the question.
An embryonic stem cell is the first cell in the embryo, this is what creates a human and helps more cells to form.
The fly species Drosophila santomea is found only on a single small island. Thus, this fly is considered to be "Endemic".
