Plants release _______ in response to attack by herbivores to signal and elicit responses from other plants and animals.
A. volatile secondary metabolites
B. hormones
C. abscisic acid
D. immune modulators
E. poison
Answer: A
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Tetanus vaccine contains
A. inactivated bacteria. B. inactivated spores. C. live bacteria. D. inactivated tetanospasmin.
In a resting neuron:a
the concentration of potassium ions is about 10 times greater inside the cell than in the extracellular fluid. b. excitatory postsynaptic potentials hyperpolarize the membrane. c. voltage-activated sodium channels are pumping sodium inside the cell against its concentration gradient. d. the membrane is more permeable to sodium than potassium ions. e. inhibitory postsynaptic potentials depolarize the membrane.
The molecule that can carry foreign DNA into host cells is a(n) ____.
A. cloning vector B. transcriptase C. DNA ligase D. endonuclease E. DNA polymerase
What significant conclusion has the classic work on the eyeless and Pax6 genes provided in terms of developmental mechanisms?
What will be an ideal response?