Chemical signaling molecules, such as interleukins and interferons, secreted by white blood cells are called ______.
A. histamines
B. neutrophils
C. hormones
D. cytokines
E. complement
Answer: D
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You have found a mutant of Streptococcus pneumoniae that has lost the ability to produce a capsule. If you inject this strain into a population of healthy mice, what prediction can you make about the consequences?
A. The mice will die of pneumonia. B. The mice will remain healthy. C. The mice will get a severe case of pneumonia and recover. D. The infection will respond to antiviral medication.
Which of the following is not a therapeutic benefit of interferon?
A. Prevents or reduces some cold symptoms B. Treats hepatitis C C. Reduces healing time D. Increases white blood cell count E. Slows progress of some cancers
When measuring membrane potential, the tip of a microelectrode is inserted into a(n) ____
a. axon b. node of Ranvier c. Schwann cell d. dendrite e. glial cell
Which of the following is true about the two populations shown here?
1.Population A had a larger starting size of breeding individuals than population B.
2.Population B had a larger starting size of breeding individuals than population A.
3.Both populations had the same starting size.
4.Population A had a larger starting size but natural selection was in place, while population B was not subject to natural selection.