The elements that make up the bulk of the Human body are
A) Carbon, Water and Nitrogen
B) Carbon, Hydrogen, Oxygen and Nitrogen,
C) Carbon, Helium, Oxygen, Nitrogen and
D) Carbon, Oxygen, Nitrogen and Iron
Ans: B) Carbon, Hydrogen, Oxygen and Nitrogen,
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Freshwater lakes in temperate regions will turn over
in the a. fall. b. winter. c. spring. d. summer. e. fall and spring.
The structures that connect neighboring cardiac muscle cells to ensure rapid electrical conduction are
a. desmosomes. b. intercalated discs. c. synapses. d. endothelial cells. e. smooth muscle cells.
A constriction of an arteriole in response to stretch of the arteriole smooth muscle is called
A) active hyperemia. B) hypoxia. C) myogenic response. D) reactive hyperemia. E) ischemia.
What is the right sequence of steps during infection of plants by nitrogen-fixing bacteria?
A) Nodule forms; infection thread grows into the root cortex; rhizobia proliferate inside of root hair; rhizobia release flavonoids and Nod factors. B) Rhizobia release Nod factors; roots release flavonoids; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. C) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. D) Rhizobia release flavonoids; roots release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. E) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex.