What mechanism is used to prevent self-pollination in angiosperms?
a. separating male and female individuals
b. shedding of pollen when the stigma of that flower is receptive to pollen
c. separating male and female flowers
d. preventing a plant form recognizing its own pollen with self-incompatibility genes
e. stimulating growth of the pollen tube with self-incompatibility genes
a
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Identify this vertebrate structure. What do the rings present?
What will be an ideal response?
All the following antimicrobial agents work by inhibiting cell wall synthesis except:
A) cephalosporins. B) chloramphenicol. C) penicillin. D) vancomycin.
Which flower trait is associated with butterfly pollination?
a. bowl-shaped, closed during the day b. strong, musty smells emitted at night c. absence of nectar d. dull flower colors, such as white or green e. bright flower colors, such as red and purple
A nerve whose fibers conduct impulses only away
from the central nervous system is a. exclusively motor. b. exclusively sensory. c. motor or sensory depending on body location. d. a spinal nerve. e. a cranial nerve.