When a cell makes a cell membrane bound growth factor that binds to receptors on neighboring cells causing them to proliferate, this is an example of _____.
A. contact-dependent signaling
B. autocrine signaling
C. direct intercellular signaling
D. paracrine signaling
E. endocrine signaling
A. contact-dependent signaling
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Extremely high or low doses of an immunogen may suppress a specific immune response by stimulating the development of
A) specificity. B) memory. C) tolerance. D) class switching.
In addition to mechanical breakdown and protein digestion, the stomach's other major function is (select all correct choices):
A. lipid digestion. B. nucleic acid digestion. C. food storage. D. glucose digestion. E. glucose digestion and food storage.
Farmers often practice crop rotation to help enrich agricultural fields. Why are beans and other legumes often used in the rotations?
A. Less carbon dioxide. B. Bacteria in legume root nodules are nitrifiers. C. Legumes remove toxins from the soil. D. Legumes enrich the soil by forming heterocysts. E. Beans fix nitrogen.
E = unattached earlobes. e = attached earlobes. In the cross of Ee and Ee, the chance of a child with unattached earlobes is _____.
a. 3/4 b. 1/4 c. 1/2