Identify a greenhouse gas that can be produced primarily by microorganisms.
A) oxygen
B) propane
C) sulfur
D) methane
Ans: D) methane
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All of the following are autoimmune diseases
EXCEPT a. Graves' disease. b. multiple sclerosis. c. rheumatoid arthritis. d. AIDS. e. lupus.
In females, a(n) primary oocyte completes meiosis II at the time of fertilization. Indicate whether the statement is true or false
Which of the following traits is NOT characteristic of the genus Ignicoccus?
a. presence of ester-linked lipids in the cell membrane b. absence of an S-layer c. presence of a periplasm d. presence of ATPase in an outer membrane
Which subatomic particles can vary between isotopes of the same element, without changing the observed chemical properties?
(a) electrons (b) protons and neutrons (c) neutrons (d) neutrons and electrons