Tryptophan is one among many amino acids necessary to create proteins, including enzymes. If a cell lacks the trp gene, thereby unable to synthesize tryptophan, tryptophan would simply need to be supplied in the diet. Thus, making it an essential amino acid.
That is actually the case for humans. And just like in humans, as long as it is supplied in sufficient amounts, the cell's growth will be normal. If it's not supplied in sufficient amounts, the cell's growth will be stunted, or worse, it could die.
What would be the phenotype (growth characteristic) of a cell that lacks the trp genes (genes required for thesynthesis of tryptophan)?
What would be the phenotype of a cell missing the lac genes (genes whose products catabolize the carbohydrate lactose)?
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