Transgenic plants have been modified for all of the following characteristics except:
A) nitrogen fixation.
B) herbicide resistance.
C) insect resistance.
D) improved nutritional quality.
E) reduced cost of production.
A) nitrogen fixation.
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Individuals can prevent osteoporosis by including sufficient supplies of vitamin C and calcium in their diets and maintaining a consistent exercise program
Indicate whether the statement is true or false
How is the development of autoimmunity normally prevented?
A. T lymphocytes that respond to autoantigens in the thymus undergo clonal deletion. B. T lymphocytes require a specific set of cytokine signals to become activated. C. Regulatory T cells suppress autoimmune responses. D. Clonal deletion of T cells and regulatory T cell suppression prevent autoreactive T cell activation. E. Clonal deletion of T cells, lack of necessary cytokine signals, and regulatory T cell suppression prevent activation of autoreactive T cells.
Groups of the same cell type that serve a particular purpose are called:
a. colonies. b. organs. c. organ systems. d. tissues. e. functional clusters.
Sugary secretions of plants attract various insects as a source of nutrition. In addition to pollination, which of the following can be a benefit for the plant in this relationship?
a. nutrition from the insects when they die near the plant b. cooling effect of being shaded by the insect from the sun c. protection from herbivory d. insects that can keep the plant pruned