A coelom is a _____
a. type of bristle c. sensory organ
b. resting stage d. lined body cavity
D
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Spontaneous reactions have a _____________ G
A. positive B. negative C. zero
Why were the slime molds and water molds once considered to be fungi?
A. Early identification methods focused on appearances rather than biochemical characteristics. B. Early identification methods focused on appearances rather than genetic similarities/differences. C. They ARE fungi. D. They possess the same material in their cell walls (chitin) that fungi possess.
Answer the following statements true (T) or false (F)
1. The same neurotransmitter may produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds. 2. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 3. Ionotropic receptors act by activating G proteins in target cells. 4. Metabotropic receptors act by initiating changes in second messenger systems in target cells.
The refractory period of a neuron plasma membrane is important because
a. it establishes the resting potential. b. it initiates an action potential. c. it ensures that the threshold potential will be reached. d. it ensures that an impulse will travel in a one-way direction. e. in resets the threshold potential.