While having lunch with a group of students who have also just read this module, one of your peers advises the rest of you to skip your turkey sandwiches because “turkey contains tryptophan, which is absorbed by your cells and makes you sleepy, and if you’re sleepy, you won’t pass the module quiz.” Yours isn’t a turkey sandwich, but you remember reading about tryptophan in the section on Prokaryotic Gene Regulation. Which of these statements is true?
a. only E. coli bacteria contain tryptophan
b. tryptophan cannot be absorbed by prokaryotic cells
c. E. coli synthesize more tryptophan when it is present
d. E. coli can synthesize tryptophan when it is absent
c. E. coli synthesize more tryptophan when it is present
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A test cross is performed to determine phenotype
__________________ Indicate whether the statement is true or false.