Which of these white blood cells are phagocytic?
A. neutrophils
B. macrophages
C. lymphocytes
D. both neutrophils and macrophages
E. both lymphocytes and macrophages
Answer: D
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New roots can only form from existing root tissue
A. true B. false
Refer to Figure 53-5. The survivorship curve for elephants would be represented by the curve labeled:
a. A
b. B
c. C
d. Either A or C. It would depend upon the species.
e. Elephant populations would be better represented by a curve falling between A and B.
You discover a green, filamentous multicellular eukaryote growing at the edge of a pond. How could you determine if the organism is a green alga or a plant?
a. Determine if the organism protects and nourishes its embryos. b. Determine if the organism protects its zygotes. c. Examine the cell walls to see if they are composed of cellulose. d. See if the organism stores its excess carbohydrates in the form of starch. e. Test for the presence of chlorophylls
Cancer of the colon is caused by
A) a single somatic cell gene mutation. B) several somatic cell gene mutations. C) a physical rupture of the colon. D) a diet high in fiber and low in fat.