Which of the following are found in lymph nodes?
A. T lymphocytes
B. B lymphocytes
C. Macrophages
D. All apply.
Answer: D
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The element sulfur has an atomic number of 16 and mass number of 32. How many neutrons are in the nucleus of a sulfur atom? If sulfur forms covalent bonds with hydrogen, how many hydrogen atoms can bond to one sulfur atom?
Which statement is incorrect?
a. The Y chromosome stimulates production of SRY protein by primitive gonadal cells. b. Ovaries must be present for feminization of the reproductive tract and external genitalia to occur. c. H-Y antigen directs differentiation of the primitive gonads into testes. d. Secretion of testosterone and Müllerian inhibiting factor by the fetal testes induces development of the reproductive tract and external genitalia along male lines. e. Early in development, embryos of both sexes have the same indifferent reproductive tissues capable of differentiating into either a male or female reproductive system depending respectively on the presence or absence of masculinizing factors.
This chemical structure would be the general representation of ________. 
A. a nucleic acid B. an amino acid C. a fatty acid D. glycerol
White blood cells containing granules and lobed nuclei are classified as ________
A) agranulocytes B) granulocytes C) thrombocytes D) megakaryocytes