How does a noncompetitive inhibitor decrease the rate of an enzyme-catalyzed reaction?
A) by binding to the active site of the enzyme, thus preventing binding of the normal substrate
B) by binding to an allosteric site, thus changing the shape of the active site of the enzyme
C) by decreasing the free-energy change of the reaction catalyzed by theenzyme
D) by binding to the substrate, thus changing its shape so that it no longerbinds to the active site of the enzyme
Answer: B) by binding to an allosteric site, thus changing the shape of the active site of the enzyme
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Lateral meristem that contributes to the increase in thickness of a stem or root.
Choose the letter of the best match: A. protoderm B. vascular cambium C. apical meristem D. procambium E. ground meristem
Matching. Choose the one most appropriate answer
for each. Some letters may not be used. 1. ___ abscisic acid 2. ___ annual 3. ___ biennial 4. ___ coleoptile 5. ___ ethylene 6. ___ salicylic acid 7. ___ gibberellin 8. ___ auxin 9. ___ phytochrome 10. ___ circadian 11. ___ short-day plant 12. ___ target cell 13. ___ long-day plant 14. ___ Pfr 15. ___ vernalization A. flower each successive year or after several years of vegetative growth B. promotes cell elongation in stems C. has receptor sites for a particular hormonal message D. a hollow, cylindrical organ that protects young leaves growing within it E. blue-green pigment that absorbs light energy F. low-temperature stimulation of flowering G. stimulates stomata closure and might be involved in root geotropism H. stimulates fruit ripening I. reproduces in spring J. produces only roots, stems, and leaves the first growing season and produces flowers the second year K. occurring on a 24-hour cycle L. flowers in autumn M. a nonhormonal plant growth regulator N. lives for only one growing season O. promotes stem elongation in plants P. pigment involved in flowering process
A biological safety cabinet filters out more microorganisms than an N95 mask.
Answer the following statement true (T) or false (F)
Which of the three major lines of defense functions to prevent pathogens from entering the body?
A) phagocytic white blood cells B) skin and mucous membranes C) acquired defenses