When a trait is polygenic, but has a small number of discrete classes, it is said to be a(n) ________ trait
A) meristic B) oncogenic C) threshold D) qualitative E) continuous
Answer: C
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An increase to 0.5% carbon dioxide in the air (from the normal 0.03%) makes a person breathe 10 times faster. Which alteration in homeostatic conditions in the blood would limit how long a person can hold their breath?
A. Lack of carbon dioxide raises the pH. B. Lack of oxygen raises the pH. C. Buildup of carbon dioxide lowers the pH. D. Buildup of oxygen lowers the pH. E. Buildup of nitrogen raises the pH.
The interaction between panic grass and its endophyte fungus that allows them to grow at 65°C together, but not independently, is an example of
A. commensalism. B. predation. C. parasitism. D. competition. E. mutualism.
Allergens combine with IgE to cause mast cells to release ________
A) interferons B) histamine C) plasma cells D) interleukin I
The area surrounding cells outside the plasma membrane is referred to as the ________ environment
Fill in the blank(s) with correct word