Mycorrhizae are especially effective in helping plant roots uptake
A. nitrogen.
B. phosphorus.
C. potassium.
D. iron.
E. magnesium.
B. phosphorus.
Mycorrhizal fungi form a mutualistic symbiotic relationship with plants. In exchange for carbohydrates, the fungi transfer phosphate to the plant.
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In humans, the gonads ____
a. produce gametes only b. secrete hormones only c. nourish the embryo only d. produce gametes and secrete hormones only e. produce gametes, secrete hormones, and nourish the embryo
Vesicles are used for transport during which of the following?
a. endocytosis only b. exocytosis only c. phagocytosis only d. both endocytosis and exocytosis
Which term BEST describes populations of trees, insects, mammals, fungi, bacteria, and many other organisms that interact in any location?
A. biosphere B. ecosystem C. bioregion D. community
A researcher examines a microsatellite locus in a wild population of D. melanogaster. She finds that in a sample of 50 individuals, 35 different alleles are segregating. The best explanation for the presence of all of these alleles is:
a. balancing selection. b. mutation. c. the neutral theory. d. overdominance. e. the law of large numbers.