The Cl- ion has a single negative charge and the atomic number of 17. How many electrons are on its innermost shell?
A) 9 B) 18 C) 17 D) 2
Answer: D
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Lysozyme is an enzyme that can ultimately lyse and kill eukaryotic cells by breaking ?-1,4-glycosidic bonds in peptidoglycan
Indicate whether the statement is true or false.
Most plants store carbohydrates in the form of
(a) glucose. (b) sucrose. (c) starch. (d) water.
The primary root of a seedling grows down
a. to avoid light. b. in response to gravity. c. because the cells on the upper surface of the root elongate more rapidly than those on the lower surface of the root. d. in response to different concentrations of auxin. e. because of all of these except "to avoid light."
Dibenzoylhydrazines are a category of molecules that have been used as insecticides. They work by blocking ecdysteroid receptors. How does this kill an insect?
A. The insect can no longer excrete nitrogenous wastes. B. The insect cannot molt. C. The chitinous exoskeleton is dissolved. D. The insect can no longer coordinate its movements.