How do naked viruses differ from enveloped viruses in their attachment/penetration phase?
a. They uncoat after they enter the cell.
b. Their DNA attaches to receptors on the cell surface.
c. Their protein coat fuses to the cell membrane.
d. Their nucleic acids are injected into the cell.
Answer: d. Their nucleic acids are injected into the cell.
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Cells with cilia or flagella rely mainly on ___________________ to facilitate their movement
A. microtubules B. microfilaments C. intermediate filaments
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?
The major microtubule-organizing center in most animal cells is the
a. kinetochore. b. centriole. c. centrosome. d. centromere. e. kinetosome.
In general, the vessels that carry blood away from the heart in a closed circulatory system are referred to as
A. auxiliary hearts. B. capillaries. C. arteries. D. sinuses. E. veins.