The utricle and saccule are functional parts of
the
a. eye.
b. Pacinian corpuscle.
c. vestibular apparatus.
d. nasal epithelium.
e. vomeronasal organ
C
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In ________, cells are mixed with recombinant DNA and exposed to a brief pulse of high-voltage electricity to cause the membrane to become permeable and allow the uptake of DNA from its environment.
Fill in the blank(s) with the appropriate word(s).
Phosphofructokinase is regulated by a number of factors, including high levels of ATP. Why is this enzyme regulated by ATP levels?
A. If ATP levels are high, this provides a mechanism to directly inhibit the Citric acid cycle, thus preventing further generation of NADH, FADH2 and ATP molecules that are not needed. B. If ATP levels are high, this provides a mechanism to directly inhibit the electron transport chain, thus preventing the formation of a proton gradient in the intermembrane space of mitochondria. C. If ATP levels are high, it is important to directly inhibit the reaction that commits the substrate to glycolysis to allow the substrate to be available for other reactions, since the cell has ample energy. D. If ATP levels are high, it is important to inhibit ATP synthase, and phosphofructokinase directly inhibits ATP synthase.
Changes in both cell shape and cell position are involved with which process(es)?
A) gastrulation B) organogenesis C) cleavage D) A and B only E) A, B, and C
Fungi consist mainly of ________, which can become visible without a microscope
a. conidia b. mycelium c. fruiting bodies d. hyphae