Termites are insects that require the protozoan Trichonympha in their gut to synthesize the enzyme cellulase to degrade the cellulose in wood. The protozoan uses the end products of the cellulose breakdown (glucose). This is a(n) ________ relationship.
A. mutualistic
B. parasitic
C. commensualistic
D. antagonistic
Answer: A
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The reaction diagrammed to the right (more than once answer may apply):
A. is the final reaction of glycolysis. B. is one possible pathway in the fermentation of pyruvate. C. shows synthesis of the substrate that enters the citric acid cycle. D. occurs in the cytosol. E. occurs in the mitochondrial matrix. F. occurs twice for each glucose oxidized.
Arteries carry ____
a. blood toward the heart b. blood away from the heart c. only oxygen-rich blood d. only oxygen-poor blood e. a combination of more than one of these
Which statement is true?
1.Both the parasympathetic and sympathetic nervous systems send nerves to all organs. 2.The sympathetic nervous system that supplies an organ will also provide parasympathetic nerves to it. 3.The sympathetic branch can have either excitatory or inhibitory effects depending on effects from the environment. 4.The sympathetic branch of the autonomic system usually speeds up the activities of the body. 5.The parasympathetic system usually speeds up the activities of the body.
Which one of the following antimicrobial agents is an inhibitor of cell wall synthesis?
A) tetracycline B) penicillin C) chloramphenicol D) erythromycin