The first signal during helper T-lymphocyte activation involves
A. BCR of the helper T-cell binding with free antigen and engulfing it.
B. CD8 of the helper T-cell binding with MHC class III of the antigen-presenting cell.
C. CD4 of the helper T-cell binding with MHC class I part of the antigen fragment.
D. CD4 of the helper T-cell binding with MHC class II of the antigen-presenting cell.
D
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A) can also be called mitosis B) is spontaneous, not requiring enzyme action C) takes place during interphase of the cell cycle D) occurs only in translationally active areas
Name two ways to finish off the end of a rope
What will be an ideal response?
Which type of neural circuit allows one motor neuron in the brain to cause thousands of muscle fibers to contract?
A. Parallel after-discharge B. Long-term potentiation C. Recruitment D. Converging E. Diverging
The hepatic portal system allows for the processing of
A. nutrients and toxins absorbed from the gastrointestinal system into the blood. B. drugs and toxins in the blood so that they are secreted directly into the urine. C. hormones that are secreted by glands and must be directed to their target organs. D. bacteria that grow in the large intestine but need to be regulated.