Most human infections caused by species of Rickettsia ____.
A) Are acquired from fomites
B) Could be prevented by handwashing
C) Are transmitted via vectors
D) Are sexually transmitted
Answer: C) Are transmitted via vectors
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The most abundant type of DNA repeat sequence is called a
A) genome. B) lipidome. C) proteome. D) transposon.
Body cells that respond to insulin include
A) Liver cells, as well as most other cells of the body. B) Liver cells and muscle cells only. C) Intestinal cells only. D) Muscle cells only. E) Liver cells only.
In response to injury, cell fragments called platelets get activated to induce clotting. Activated platelets release factors that can in turn bind to specific membrane receptors on nearby cells. What type of signaling would this be considered?
A. Direct contact B. Synaptic C. Paracrine D. Endocrine E. Autocrine
Both walnut and Ginkgo trees lose their leaves in the fall when day length starts decreasing. Based on these observations one may conclude that many tree species will lose their leaves in the fall in response to decreasing day length. This statement is an example of:
A. inductive reasoning B. deductive reasoning C. a theory D. an experiment