The class of lever in which the effort is located between the fulcrum and the load is called
(a) class I.
(b) class II.
(c) class III.
(d) class IV.
(c) class III.
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The precipitation of soluble iron ions into solid iron occurs spontaneously in the presence of organic carbon compounds
Indicate whether the statement is true or false.
Mycorrhizae are a symbiotic association of
A. bacteria and algae. B. bacteria and virus. C. fungi and virus. D. plant roots and fungi.
The class of neurotransmitters that most commonly acts as a modulator of postsynaptic cell response are the
A. amino acids. B. gases such as nitric oxide. C. neuropeptides. D. biogenic amines. E. acetylcholine.
Which of the following actions occurs in many plants when CO2 concentrations are high?
A. Guard cells lose turgor, and the stomata close. B. Water evaporates at a higher rate than usual. C. CAM photosynthesis fixes CO2 at night. D. Oxygen is used by plants for photosynthesis. E. Calcium ions are transported faster through the phloem.