In what way are semisynthetic penicillins and natural penicillins alike?
A) Both are broad spectrum.
B) Both are resistant to penicillinase.
C) Both are resistant to stomach acids.
D) Both are bactericidal.
E) Both are based on ?-lactam.
E
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Which of the following would most likely have the highest DDT concentration in tissue?
a. zooplankton b. small herbivorous fish c. large predatory fish d. osprey e. large herbivorous fish
Write the letter of the event that happens first in the development of song in male zebra finches next to
1. Sequence the following events, with the final event in the pathway written next to 6.
A. structure and function of neurons are changed B. neurons anticipate key acoustical events C. a territory owner habituates to the sound of his singing neighbor D. exposure of hatchling to its species' song E. an enzyme is produced F. zenk is activated 1. 2. 3. 4. 5. 6.
Paired lungs are characteristic of ____.
A. spiders B. all birds C. all fishes D. all amphibian life stages E. all insects
In the synthesis of amino acids, the addition of the amino nitrogen usually occurs ________ the synthesis of the carbon skeletons.
A. after B. during C. before