Smooth muscle lines hollow organs like blood vessels and the digestive tract
a. true
b. false
Answer: a. true
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Imagine that you are a medical student working in a cancer research laboratory. Your boss has given you samples of cancer cells and blood from a patient
She has told you that the cells have no mutations in any of their signaling molecule proteins (i.e., all the proteins are normal), but the cells' signaling transduction properties are not normal, causing them to be cancerous. Which of the following could account for the increased cell proliferation in the patient? A. The cells taken from the patient have more growth factor receptors than normal. B. The concentration of a signaling molecule in the patient is higher in the patient than usual. C. The cells taken from the patient exhibit a reduced level of signal amplification. D. Both A and B. E. A, B, and C.
In the crystal matrix of ordinary salt, the sodium and chlorine are held together by:
A. peptide bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. nonpolar bonds.
A chimera is an organism containing two or more kinds of genetically similar cells from different zygotes. Indicate whether the statement is true or false
Action potentials are normally carried in only one direction: from the axon hillock toward the axon terminals. If you experimentally depolarize the middle of the axon to threshold, using an electronic probe, then _____
A) no action potential will be initiated B) an action potential will be initiated and proceed only in the normal direction toward the axon terminal C) an action potential will be initiated and proceed only back toward the axon hillock D) two action potentials will be initiated, one going toward the axon terminal and one going back toward the hillock