Which of the following steps initiates an inflammatory response?
A) Macrophages engulf the debris or foreign material.
B) Macrophages secrete cytokines.
C) Arterioles dilate.
D) Capillary permeability increases.
E) Leukocytes migrate to the infection.
Answer: A) Macrophages engulf the debris or foreign material.
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Which tissue distributes water and dissolved mineral ions through vascular plant bodies?
a. plasmodesmata b. phloem c. xylem d. rhizomes e. meristem
Which of the following consists of a hollow ball of cells?
a. gastrula b. morula c. blastula d. blastocoel e. zygote
Can a theory be proved wrong?
A. No, theories are the same as facts. B. No, because there is no good way to test a theory. C. Yes, a new observation or interpretation of data could disprove a theory. D. Yes, theories are the same as hypotheses.
Plants do not have a circulatory system like that of some animals. If a water molecule in a plant did "circulate" (that is, go from one point in a plant to another and back in the same day), it would require the activity of _____
A) only the xylem B) only the phloem C) only the endodermis D) both the xylem and the phloem