Why would bacteria evolve so that the presence of tryptophan inhibits its own production?
A. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary.
B. Producing high levels of tryptophan inhibits the production of other amino acids, so inhibiting its production allows all amino acids to be synthesized at equal concentrations.
C. High levels of tryptophan causes cells to become unresponsive to external stimuli, so its production must be regulated.
D. High levels of tryptophan inhibit cellular respiration and the synthesis of ATP, so its production must be regulated.
E. All of these choices are TRUE
A. Producing the enzymes that synthesize tryptophan is metabolically expensive, so it is wasteful to make them when tryptophan levels are high and its synthesis is not necessary.
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a. affect kidney functioning b. are secreted in response to signals from the medulla oblongata c. control the release of hormones from other endocrine glands d. are steroid hormones e. effect target cells in the posterior pituitary
A person who inherited the allele combination Aa is ____
a. homozygous dominant b. homozygous recessive c. heterozygous d. codominant e. dominant
The nutritive tissue in a mature pine seed is triploid
____________________ Indicate whether the statement is true or false.
A student performed the modified use-dilution test described in this exercise, after incubation the nutrient broth appeared cloudy. What does this mean?
A) The disinfectant was effective at killing all the bacterial cells on the washer B) The disinfectant was not effective at killing all the bacterial cells on the washer