Why is the cohesion of water important for biological systems?
A) It helps to moderate the temperature of cold-blooded animals.
B) It helps transport water from the roots to the leaves of a plant.
C) It prevents chemical reactions from occurring in body systems.
D) It prevents salts from dissolving inside the plasma membrane.
B
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Agrobacterium infects plants and causes them to form tumors. You are asked to determine how long a plant must be exposed to these bacteria to become infected. Which of the following experiments will provide the best data to address that question?
A) Determine the survival rate of Agrobacterium when exposed to different concentrations of an antibiotic. B) Measure the number of tumors formed on a plant when exposed to various concentrations of Agrobacterium. C) Measure the concentration of Agrobacterium in different soil environments where the plants grow. D) Measure the number of tumors formed on plants, which are exposed to Agrobacterium for different lengths of time.
The competitive exclusion principle states ________.
a) two species cannot occupy the same niche in a habitat b) certain species can have disproportionately large effects relative to their abundance c) certain small areas hold unusually large number of species d) nonnative species introduced into a new ecosystem can cause native species to go extinct
Stratification refers to the extended exposure to ________ that is required for some seeds to germinate.
A. high relative humidity B. low temperatures C. short daylengths D. long wavelengths of light E. clay soil particles
Which of the following are safety concerns when weight training?
What will be an ideal response?