Which of the following is an assimilation process?
A) Thiobacillus: H2S ? S0
B) Desulfovibrio: SO42- ? H2S
C) Proteus: Sulfhydryl-containing amino acids ? H2S
D) Redwood tree: SO42- ? Sulfhydryl groups of amino acids
E) Photosynthetic bacteria: H2S ? S0
D
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A gene that promotes the development of cancer is called a(n) _______
A. clone B. tumor suppressor gene C. mutagen D. carcinogen E. oncogene
Graded potentials are particularly important for conveying stimulus intensity in
A. sensory neurons. B. motor neurons. C. interneurons. D. skeletal muscle cells. E. Schwann cells.
Excess glucose taken up by the liver is converted to
a. fat. b. glycogen. c. bile salts. d. fructose. e. proteins.
What is the theoretical limit of resolution of a light microscope used to look at a sample through oil?
a. 0.22 micrometers b. 0.2 nanometers c. 1 millimeter d. 0.305 micrometers