What plant secondary metabolite was isolated from the Cinchona tree to fight malaria?
A. digitalis
B. penicillin
C. acacia
D. taxol
E. quinine
E. quinine
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In a cell,
a. energy-releasing reactions are coupled to energy-absorbing reactions. b. there are many more energy-absorbing reactions than energy-releasing reactions. c. energy-absorbing reactions and energy-releasing reactions are unlinked. d. energy-absorbing reactions are coupled to energy-releasing reactions via electron carriers. e. more energy is used up than is produced.
Most reabsorption occurs in the distal convoluted tubule
____________________ Indicate whether the statement is true or false.
How do radioactive isotopes differ from isotopes?
A) Radioactive isotopes have more neutrons than do isotopes. B) Radioactive isotopes are stable; isotopes are unstable. C) Radioactive isotopes have fewer neutrons than do isotopes. D) Radioactive isotopes are unstable; isotopes are stable.
Which of the following is not involved in body temperature homeostasis?
A. the hypothalamus B. secretion by sweat glands C. shivering D. constriction or dilation of blood vessels E. respiration rate