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

TLS Online TPP Program

#Question id: 965

#Unit 1. Molecules and their Interaction Relevant to Biology

How many ATP are consumed in the conversion of bicarbonate to carbamoyl phosphate?

TLS Online TPP Program

#Question id: 362

#Unit 1. Molecules and their Interaction Relevant to Biology

A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?

TLS Online TPP Program

#Question id: 26929

#Unit 10. Ecological Principles

Which of the following statements define correct differences between ecological compression and ecological release?

a.long term evolutionary response and population explosion

b.More number of species coexist together and species is freed from limiting factors in its environment

c.Non inheritable trait and ecological release is the expansion of range

d.change habitat with reducing the food range and decreasing population

TLS Online TPP Program

#Question id: 19057

#Unit 13. Methods in Biology

Which of the statements is correct about Gas chromatography?

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#Question id: 5465

#Unit 8. Inheritance Biology

A pure line apple plant yielding 3.5 pound apple was crossed with a .5 pound apple yielding plant, all F1 progenies yielded apples of 2 pound, F1 plant allowed to self fertilization then what will be proportional of 3 pound, 2 pound and .5 pound respectively among offspring if character is governed by 3 pair of polygene