The most common circulating antibody, comprising about 80% of the serum immunoglobin, is
A) IgA.
B) IgC.
C) IgD.
D) IgG.
Answer: D
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The biological specialty that deals with the reconstruction and study of phylogenies is called _________.
Fill in the blank(s) with the appropriate word(s).
The somatic nervous system controls
A) the brain and spinal cord. B) some glands. C) skeletal muscles. D) cardiac muscle. E) smooth muscle.
Compare the events of meiosis I and II in the production of gametes
What will be an ideal response?
Which of the following statements is not true of members of clade Archaea?
a. They appear to be more closely related to eukaryotes than to bacteria. b. They have cell walls that lack peptidoglycan. c. They lack membrane-enclosed organelles but do have a nuclear envelope. d. They are often found in harsh habitats. e. They include the methanogens, extreme halophiles, and extreme thermophiles as well as groups found in more moderate habitats.