In E. coli, the five contiguoustrp genes encode enzymes that sythesize the amino acid tryptophan. These genes are expressed efficiently only when tryptophan is limiting. The genes are controlled by a repressor, just as the lac genes are, although in this case, it is the absence of its ligand (tryptophan) that relieves repression, match trp genes to their gene product,

Trp genes	Gene products
trpE	anthranilate synthetase
trpD	phosphoribosyl anthranilate transferase
trpC	phosphoribosyl anthranilate isomerase-indole glycerol phosphate synthetase
trpB	tryptophan synthetase beta
trpA	tryptophan synthetase alpha

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#Question id: 28397

#Unit 5. Developmental Biology

During the specification of amphibian axes, in the absence of any induction cell leads to become which of the following fate?

TLS Online TPP Program

#Question id: 11191

#Unit 7. System Physiology – Animal

Opening all of the sodium channels on an otherwise typical neuron, with all other ion channels closed (which is an admittedly artificial setting), should move its membrane potential to ________.

TLS Online TPP Program

#Question id: 28375

#Unit 5. Developmental Biology

 How the pelle protein is responsible for the formation of ventral side of the embryo?

TLS Online TPP Program

#Question id: 24621

#Unit 2. Cellular Organization

Which of the following component has the highest proportion in human genome

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#Question id: 7164

#Unit 5. Developmental Biology

If an amphibian zygote is manipulated so that the first cleavage plane fails to divide the gray crescent, then ________.