The response to touch by such plants as the sensitive plant is due to
A. changes in water content of cells.
B. auxin displacement in the touched area.
C. effect of gibberellins on the area affected.
D. sensitive responder cells.
A. changes in water content of cells.
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The causative agent of streptococcal pharyngitis, also known as "strep throat," is
A) Streptococcus pyogenes. B) Streptococcus pneumoniae. C) Streptococcus mutans. D) Streptococcus lactis.
Secondary metabolites are produced to
A. deter herbivores. B. deter competitors. C. aid in reproduction. D. aid in growth. E. deter competitors and aid in reproduction.
Ricin exerts its effects on a human cell by _____
a. inactivating synthesis of carbohydrates b. inhibiting hydrolysis of carbohydrates c. preventing protein synthesis d. interfering with hydrolysis of lipids e. over activating nucleic acid metabolism
Successful insertion of a DNA fragment into the polylinker region of pBluescript II is detected by
A) production of the enzyme ?-galactosidase. B) absence of the enzyme ?-galactosidase. C) the increased size of the plasmid. D) autoradiography. E) None of these