How do water moulds differ from true fungi?
a. Water moulds are haploid, while fungi are diploid.
b. Water moulds form hyphae, while fungi form mycelia.
c. Water moulds have a different genetic composition than fungi do.
Ans: c. Water moulds have a different genetic composition than fungi do.
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Abscisic acid is an important signal, transported from roots to the stem and leaves during times of water stress, that prevents
A. additional auxin production. B. ethylene buildup in the stems. C. leaf drop. D. phototropism. E. stomatal opening.
Which of the following is an extreme and potentially fatal response to an allergen?
a. anaphylactic shock b. hypersensitivity c. autoimmune syndrome d. systemic lupus
What are hormones?
A. They are chemicals transported in the blood that affect target cells throughout the body. B. They are chemicals transported in the blood that affect all cells similarly. C. They are chemicals that affect cells right next to where they are produced. D. They are carbohydrates on the surface of red blood cells that affect targeted cells throughout the body.
Why would having a four-chambered heart, as in birds and mammals, optimize efficiency of oxygen delivery to tissues?
A. Diffusion of oxygen from oxygenated blood into tissues would be increased. B. Diffusion of oxygen from oxygenated blood into tissues would be decreased. C. Less energy would be required to pump oxygen into the blood. D. Less energy would be required to pump oxygen into the tissues. E. Less energy would be required to pump oxygen into the lungs.