Monod discovered that if tryptophan is present in relatively high quantities in the growth medium, the enzymes necessary for its synthesis are repressed. How does this occur?
What will be an ideal response?
Tryptophan acts as a corepressor to activate the tryptophan repressor protein; it also is involved in an attenuation system, which causes termination of transcription.
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How are symbiotic relationships important in agriculture and food production? Use at least two different examples to support your answer and explain how understanding these symbioses could help produce more food
What will be an ideal response?
A bacterium is found that can photosynthesize in the presence of light but uses hydrogen sulfide and releases elemental sulfur as a by-product. This organism can best be classified as a
A. photoautotroph. B. pathogen. C. photoheterotroph. D. chemolithoautotroph. E. chemoheterotroph.
The specificity principle refers to the fact that training is specific to the muscles exercised.
a. true b. false
_______________ is the term for differences among individuals in a population.
A. Migration B. Variation C. Gene Flow D. Macro evolution E. Microevulation