When an electrical impulse traveling along a motor neuron arrives at a neuromuscular junction
A) there is an increase in the secretion of acetylcholine at the neuromuscular junction.
B) calcium is transported back to the sarcoplasmic reticulum.
C) sliding of actin and myosin filaments is inhibited.
D) myosin-actin cross-bridges are destroyed.
E) a new electrical impulse is generated that returns the message to the original nerve.
A
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You have isolated a newly discovered virus and are attempting to characterize it. You begin with its genome. You first isolate the virion-producing mRNA from cultured cells infected with the virus
When you compare these mRNA to the viral genome, you find that they are complementary. What does this tell you? A) This virus has a positive-sense genome. B) This virus has a negative-sense genome. C) This virus has an ambisense genome. D) The virus does not use DNA or RNA.
Which of the following is NOT added to each of the 4 assay tubes when performing the dideoxy method for DNA sequencing?
A. many copies of target DNA B. primers C. DNA polymerase D. one of the 4 deoxynucleotides (radiolabeled) E. one of the 4 dideoxynucleotides
Which of the following is TRUE of fertilization?
A. It restores the egg to a diploid state. B. It activates cell division. C. It is critical to maintaining membrane polarity. D. It both restores the egg to a diploid state and activates cell division. E. It both restores the egg to a diploid state and maintains membrane polarity.
In which marine environment would you find the greatest diversity of species?
What will be an ideal response?