Recall that several vascular bundles (containing phloem and xylem) are located around the circumference of a vascular plant stem. In contrast, a root contains one vascular bundle running down its center
What might account for this different arrangement of vascular
bundles in stems and roots?
A. Stems need to counteract the force of
gravity (and support leaves), but roots do not.
B. Roots need to quickly transport nutrients to
the rest of the plant, but stems do not.
C. Roots require less nutrients compared to
stems.
A
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a. Sodium is pumped into the cell and potassium diffuses out. b. Sodium is pumped out of the cell and potassium diffuses in. c. Sodium and potassium are both pumped into the cell simultaneously. d. Sodium and potassium are both pumped out of the cell simultaneously. e. Sodium only binds to the pump to make it receptive to potassium which then is pumped into the cell.
Creutzfeldt-Jacob disease is
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Immune complex reactions belong to which class of hypersensitivity reactions?
A) type I B) type II C) type III D) type IV E) type V