Cell signaling between two nerve cells is an example of paracrine signaling because:
A. a signaling molecule (neurotransmitter) is
released.
B. a receptor is activated.
C. the cells are in close proximity.
D. the responding cell releases more
signaling molecule (neurotransmitter).
C
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Plants that have systemic acquired resistance (SAR) to a specific virus will be able to resist future infections whether or not the plant experiences necrosis in the first infection
A. true B. false
Natural selection operates to produce changes in
a. individuals. b. populations. c. races. d. phyla. e. animals only.
Each substance contributes to acid rain EXCEPT
a. the ozone. b. waste products from the burning of coal. c. nitrogen fertilizers. d. waste products from the burning of gasoline. e. motor vehicles.
What is overexploitation?
What will be an ideal response?