A plant growth response to mechanical stress, such as rain and contact with passing animals, is knownas:a
phototropism.
b. gravitropism.
c. thigmomorphogensis.
d. a circadian rhythm.
e. thigmotropism.
C
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Bacterial resistance to penicillin began to appear
a. several decades after its first use. b. 100 years after its first use. c. after the drug supply was largely from synthetic sources. d. during the AIDS outbreak in the 1980s. e. within a few years of its introduction into general use.
An organism that can use gaseous oxygen in metabolism and has the enzymes to process toxic oxygen products is a(n) ________.
A. aerobe B. obligate anaerobe C. facultative anaerobe D. microaerophile
The protozoan that causes malaria is an intracellular parasite of red blood cells (RBCs). An adaptive immune response to this parasite is problematic because
A. red blood cells do not produce MHC and, therefore, do not display the fact that they have been infected by presenting antigen. B. the parasite damages leukocytes along with RBCs. C. RBCs normally produce cytokines necessary for adaptive immune response, which this infection prevents. D. complement cannot effectively destroy RBCs. E. RBCs never enter lymphoid tissue.
The functions of the cytoplasm include:
A. providing the cell shape B. all of the above. C. providing movement of molecules in the cell D. providing a scaffolding for the enzymes in certain areas of the cell. E. organizing the cell's activities.