In lateral growth, the _________ is the source of new xylem and phloem, whereas the _________ renews and maintains the outer layer that protects the stem
A. cork cambium; vascular cambium
B. vascular cambium; cork cambium
C. secondary vascular tissue; primary
vascular tissue
D. sapwood; heartwood
E. apical meristem; lateral meristem
B
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High doses of AAS have been found to
a. increase TSH levels. b. decrease gonadotrophins from the hypothalamus. c. increase natural testosterone. d. decrease thyroxine levels. e. have no effect on TSH levels.
The taxon shown here with the greatest number of
named species is a. vertebrates. b. insects. c. mollusks. d. plants. e. fungi.
Oxidation
A) involves the removal of oxygen atoms from a molecule. B) is endothermic. C) occurs when an atom accepts electrons. D) occurs when oxygen atoms are added to a molecule and energy released. E) is rare in biological reactions.
The structural integrity of bacteria is to peptidoglycan as the structural integrity of plant spores is to _____
A) lignin B) cellulose C) secondary compounds D) sporopollenin