In the internal leaf structure shown above, the item labeled "1" is
a. a vascular bundle.
b. spongy mesophyll.
c. epidermis.
d. a stoma.
e. palisade mesophyll.
C
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Which of the following are components of molecules?
A. atoms B. cells C. organs D. organisms E. populations
The chytrid Batrachochytrium dendrobatidis is responsible for a disease that
a. is sexually transmitted in humans. b. has wiped out many species of frogs. c. infects wheat, rye, and other grain crops. d. is killing trees in temperate forests. e. kills millions of humans each year.
Specialized symbiotic associations between the roots of plants and fungi are called
A. a mycelial unit. B. heterokaryotic junctions. C. lichens. D. hyphal associations. E. mycorrhizae.
Which is NOT a class of antibiotic resistance mechanism?
a. modification of the drug target b. removal from the cell via efflux pump c. disruption of membrane structure d. enzymatic inactivation