The molecule that serves as the energy currency of cells is abbreviated ______ .
Fill in the blank(s) with the appropriate word(s).
Ans: ATP
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Which of the following forms of oxygen is/are generally toxic to living organisms?
A) superoxide anion B) hydrogen peroxide C) hydroxyl radical D) superoxide, hydrogen peroxide, and hydroxyl radicals are all toxic
The neural crest consists of:
A. embryonic cells on each side of the neural tube B. embryonic cells that form the kidney C. clusters of Hox genes D. cells that form hair follicles E. cells that lie along the crest of the spine
Which of these species can reproduce sexually, via self-fertilization, and fragmentation?
a. sharks b. frogs c. earthworms d. bees
In vertebrates, most of the fluid that ultimately exits the body as urine first enters the nephron tubules by the process of ________.
A. excretion B. secretion C. reabsorption D. absorption E. filtration