What is the number of covalent bonds that an atom of nitrogen can form within a molecule?
?A. 1?B. 2?C. 3?D. 4
C
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Answer the following statements true (T) or false (F)
1. Schwann cells produce myelin for neurons outside the central nervous system. 2. Nodes of Ranvier are indentations between Schwann cells. 3. One of the differences between white matter and gray matter is that gray matter has a myelin sheath. 4. Perineurium surrounds fascicle. 5. The tough outer fibrous sheath that covers the whole nerve is called the endoneurium.
You examine a sample of muscle tissue under the microscope, and it has a striped, or striated appearance. This sample could not have been taken from the ________.
A. wall of digestive tract B. muscle of the thigh C. wall of heart chamber D. muscle of the forearm
Telomeres serve to ________.
A. cap the ends of DNA and protect it from damage B. cause replication of genes C. break DNA and cause it to degrade D. increase apoptosis
Which wave on the ECG shows the repolarization of the ventricles?
A. T B. P C. Q, R, S D. None of these are correct.