The plant alkaloid ricin is nontoxic inside castor beans, but becomes active when digested by an animal. The toxic form of ricin kills by
A. inactivating the animal's immune system.
B. over stimulating the animal's heart rate.
C. inactivating ribosomes needed for translation.
D. binding to RNA polymerase.
E. releasing cyanide.
C. inactivating ribosomes needed for translation.
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Acyclovir is used to treat infections caused by ________.
A. hepatitis C virus B. influenza A virus C. HIV D. herpes simplex virus E. respiratory syncytial virus
Approximately, what percent of unplanned
pregnancies end in induced abortions?
a. 5 b. 25 c. 50 d. 75 e. 90
Pain receptors are classified as ____
a. Pacinian corpuscle b. free nerve endings c. muscle spindle d. Merkel’s discs e. Meissner’s corpuscle
What products of light reactions of photosynthesis are used in the Calvin cycle?
A. ATP and NADPH B. carbon dioxide and water C. glucose and oxygen D. ADP and NADP E. oxygen and protons