Which muscle contraction is involuntary?
A. cardiac only
B. smooth only
C. cardiac and smooth
D. skeletal only
E. cardiac, smooth, and skeletal
C. cardiac and smooth
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Neural transmission across a mammalian synapse is accomplished by _____
A) the movement of sodium and potassium ions from the presynaptic neuron into the postsynaptic neuron B) impulses traveling as electrical currents across the synapse C) impulses causing the release of a chemical signal and its diffusion across the synapse D) impulses ricocheting back and forth across the synapse E) the movement of calcium ions from the presynaptic into the postsynaptic neuron
Another toxin that also blocks neurotransmitter release is tetanus toxin; however, it primarily affects inhibitory interneurons of the spinal cord that negatively regulate motor neurons. Which would be symptoms of tetanus toxin poisoning?
A. flaccid paralysis B. spastic paralysis C. slowed action potential conduction D. pupil dilation Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about tetanus? What other information is related to the question? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Sucrose is composed of:
a. a molecule of glucose and galactose. b. two molecules of glucose. c. a molecule of glucose and a molecule of fructose. d. a molecule galactose and fructose. e. two molecules of fructose.
What is RNA interference?
A. When an RNA virus blocks the DNA replication of the host cell. B. When tRNA attaches to the ribosome and blocks its movement along the mRNA. C. When small RNAs form double-stranded RNA molecules that can regulate gene expression. D. When proteins block the transcription of DNA in the nucleus.