Autoimmune diseases are caused by the attack of
a. virus infections on joints and nerves.
b. virus or bacterial infections on cells of the immune system.
c. the immune system on viral-infected cells.
d. a person's own antibodies on his own immune cells.
e. a person's own immune cells on his own tissues.
E
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One mole of a substance contains 6.02 x 1023 molecules. The atomic number of Li is 3 and the atomic mass is approximately 7 . If you have three moles of Li, how many grams does it weigh?
A. 9 B. 21 C. 7 x 6.02 x 1023 D. 3 x 6.02 x 1023
During which phase of gamete production do duplicated homologous chromosomes line up closely?
a. meiosis I b. meiosis II c. fertilization d. mitosis I e. mitosis II
The molecule that carries the amino acid to the ribosome is
A. DNA. B. tRNA. C. mRNA. D. rRNA.
The northern copperhead is Agkistrodon contortrix contortrix, the southern copperhead is Agkistrodon contortrix mokasen, and the cottonmouth is Agkistrodon piscivorous. Therefore,
A. all are subspecies of Agkistrodon. B. they are three distinct species. C. The copperheads are subspecies and the cottonmouth is a separate species. D. they are all the same species.