A vascular bundle:
A. contains xylem and phloem
B. is not found in leaves
C. is usually scattered in the stem of a eudicot
D. is on the outer surface of a root
E. is very distinct in the apical meristem
A. contains xylem and phloem
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The protection provided through transfer of antibodies from mother to fetus is an example of
A. active immunity. B. passive immunity. C. cell-mediated immunity. D. clonal selection. E. autoimmunity.
The mycorrhizae found interacting with the roots of land plants are
a. pathogens, feeding on plant tissue they have damaged with toxins. b. parasites, draining sugar from the plant's vascular system. c. saprophytes, stripping dead tissue from the root. d. symbionts, facilitating the plant's uptake of minerals. e. commensals, exploiting a benign environment, but neither helping nor harming the plant.
Responses to heat stress include
a. reduction in muscle contraction. b. increased sweating. c. dilation of peripheral blood vessels. d. loss of salts and liquids. e. all of these.
Genes that are always "turned on" in a cell are referred to as
A) regulated genes. B) mutations. C) inducible. D) constitutive. E) catabolic.