Which of the following statements about mycorrhizae is/are true?
A. The presence of the fungi gives plants a greater absorptive surface for the intake of minerals.
B. Plants are harmed, while fungi benefit.
C. Fungi may enter the cortex of plant roots but do not enter the cytoplasm of plant cells.
D. A and C are correct.
E. A, B, and C are correct.
Answer: D
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Temporal summation is a response to the:
A. location of synapses over the surface of a postsynaptic neuron. B. frequency of stimulation of a postsynaptic cell. C. amount of neurotransmitter released from a presynaptic cell. D. density of ligand-gated channels on the postsynaptic cell.
The following regression results are from the first stage regression of Price on income and wholesale costs-which is serving as the instrument for a particular grocery product across different markets: Pricei = 3.2(1.0) + 4.3(0.8)WholesaleCostsi + 5.5(2.7)Incomei, where standard errors are reported in parenthesis. What conclusion can be drawn about the instrumental variable?
A. It's under reporting the effect of income on price. B. With a t-stat over 2.5 (4.3/0.8), the instrument is exogenous. C. It's unbiased. D. With a t-stat over 2.5 (4.3/0.8), the instrument is relevant.
Identify the modes of nutrition found in members of the protists, and include two examples of each. What will be an ideal response?
The retina of the eye responds to light, converting it into electrical impulses. The retina is made up of
A) cartilage. B) bone. C) neurons. D) smooth muscle. E) simple epithelium.