Plants obtain carbon from:
a. water
b. carbon dioxide
c. sugar
d. oxygen
e. glucose
Answer: b. carbon dioxide
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Most of the antibodies in the blood belong to the ________ class.
A. IgG B. IgM C. IgA D. IgE
Briefly discuss physiological mechanisms that regulate body temperature in endotherms. What will be an ideal response?
Why are gymnosperms considered to be "naked seed" plants?
A) Their seeds have a thin layer of endosperm. B) They do not produce seeds; they produce only spores. C) Their seeds are not enclosed within ovaries. D) Their seeds develop on the surface of sporophytes.
What are antibodies?
A) Bacteria B) Proteins produced by B cells that bind to foreign proteins C) Cells that undergo apoptosis D) Viruses E) Proteins produced by T cells that bind to foreign proteins