Signaling molecules in animals are
a. neurotransmitters.
b. hormones.
c. pheromones.
d. local signaling molecules.
e. all of these.
Answer: e
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An organism that cannot grow without oxygen is a(n) ________.
A. obligate aerobe B. microaerophile C. obligate anaerobe D. aerobe E. facultative anaerobe
Proteins are made up of many
a. RNA molecules only. b. DNA molecules only. c. RNA and DNA molecules. d. nucleotides. e. amino acids.
The structure labeled 9 in Figure 29-2 was produced by:
a. fertilization of two zygotes. b. meiosis in the resting sporangium. c. meiosis in the zoosporangium. d. mitosis in the resting sporangium. e. mitosis in the zoosporangium.
Sensory neurons release glutamate and neuropeptides such as ____ to enhance the effect of glutamate
a. GABA b. substance P c. serotonin d. norepinephrine e. epinephrine