Which type of receptors will be excited by a change in pressure or body position?
a. Photoreceptors
b. Chemoreceptors
c. Thermoreceptors
d. Pain receptors
e. Mechanoreceptors
e
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The enzyme reverse transcriptase was discovered by
A. Arber and Smith. B. Temin and Baltimore. C. Jackson, Symons, and Berg. D. Boyer and Cohen.
The main phenomenon that increases the efficiency of gas exchange in fish gills is the
A. back-and-forth movement of water that maximizes oxygen uptake. B. high degree of oxygen saturation of water. C. very high blood pressure found in the circulatory system of fishes. D. co-current exchange mechanism. E. countercurrent exchange mechanism.
the Calvin cycle occurs in ____ cells
What will be an ideal response?
Which part of the muscle cell actually does the work of contraction by attaching, pivoting, and pulling?
A) myosin heads B) calcium ions C) actin filaments D) neurotransmitter molecules