You notice that your houseplants are all growing toward the light from your window. This indicates that their stems display:
A. positive gravitropism.
B. positive thermotropism.
C. positive phototropism.
D. negative phototropism.
E. negative gravitropism.
C
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Endogenous infectious agents arise from microbes that are ________.
A. in food B. in the air C. transmitted from one person to another D. on fomites E. the patient's own normal biota
Four of the five choices listed below are possible
causes of extinction. Select the exception. a. asteroid impact b. conservation c. tectonic change d. human activity e. climate change
Which of the following is NOT an example of a human activity that directly threatens the biodiversity of species?
a) the destruction of habitats b) the picking of flowers c) the introduction of invasive species d) the overexploitation of resources e) the burning of fossil fuels
Chloroplasts and mitochondria share something with the nucleus that the other organelles do not. What is this shared function or component?
A) They are the only organelles wrapped in a lipid-based membrane. B) They are the only organelles that are located in the cytosol. C) They are the only organelles that contain DNA. D) They are the only organel