The following events occur in cellular immunity, leading to a response from TH cells. What is the third step?
A) Antibodies are produced.
B) Dendritic cell takes up antigen.
C) Antigen enters M cell.
D) TH cell produces cytokines.
E) TH cells proliferate.
E
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Which of the following is not true of small insertions and deletions?
A. They are collectively called indels. B. They can result in the formation of fusion genes. C. They are caused by aberrant recombination or by template slippage during replication. D. They do not cause frameshifts in the amino acid sequence if occurring in multiples of three. E. If only one or two bases are involved, a frameshift will occur in the amino acid sequence.
A myelin sheath functions to ____
a. protect axons b. allow nerve cells to divide c. trigger action potentials d. increase electrical propagation speeds e. promote neurotransmitter release
Which site on an enzyme is where substrates bind?
A) the activation site B) the active site C) the catalyst site D) the lock and key site
T or F: lateral flexion applies to only to the movement of the head or trunk
What will be an ideal response?