Why might a soil that has a sufficient concentration of a mineral element, for example, calcium, not have sufficient availability of the element to maximize plant growth rates?
What will be an ideal response?
Chemical reactions in soils are dependent on soil pH. If the pH is too high or too low, the nutrient
element can be in a form that is unavailable to roots. Therefore, pH can have a major impact on
whether plant roots take up various mineral cations, independent of the concentration on the mineral
element in the soil.
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What sensory receptors sense stimuli that arise from within the body?
A. gustatory receptors B. photoreceptors C. interoreceptors D. ampullae of Lorenzini E. exteroreceptors
Which hair-like cellular projections line the respiratory tract and sweep inhaled particles away from the lungs?
a. flagella b. cilia c. intermediate filaments d. pseudopods e. microvilli
In order to fit within a cell, DNA becomes more compact by
A.) breaking apart into separate genes B.) extending to form very long, thin molecules C.) wrapping tightly around histones D.) being enzymatically changed into a protein
Some of the structural components of Staphylococcus act as virulence factors. Which of the following components inhibits chemotaxis and phagocytosis, inhibits proliferation of mononuclear cells?
A. Capsule B. Peptidoglycan C. Protein A D. Teichoic acid E. Slime layer