Your text describes an experiment in which low-nutrient conditions select bacteria that would kill off other bacteria
When nutrients became plentiful again, these killer bacteria became less common because they had lower fitness in this environment, but they didn't become extinct. Why would some of the killer bacteria survive in the new environment? A) They're waiting for a future time when that trait may be useful again.
B) They have changed the killer gene to a less costly one but can regenerate the killer gene when necessary.
C) Competition must be low enough that the disadvantage of having the killer trait isn't great enough to cause extinction.
D) The killer trait is a dominant trait, so it cannot be eliminated.
C
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In the trp operon, where is the attenuator region located?
What will be an ideal response?
In an attempt to become more environmentally conscious, a woman changes her lifestyle
She begins to grow the majority of her own food in her yard without using pesticides or synthetic fertilizers, she walks rather than taking the car for trips shorter than 5 kilometers, and she uses solar and wind for her power. By taking these actions, she is A) increasing her intake of bioaccumulated compounds. B) increasing her nitrogen cycling. C) increasing her greenhouse gas output. D) decreasing her carbon footprint. E) increasing the number of endocrine disruptors to which she is exposed.
Smoking may increase your risk of lung cancer, but it does not affect the risk of bladder cancer.
a. true b. false