An antibiotic made by microorganisms and modified by chemists is called
A. anti-metabolic.
B. catabolic.
C. synthetic.
D. semi-synthetic.
D
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Which drawing in the figure above depicts the electron configuration of an element with chemical properties most similar to helium (2He)?
A) A B) B C) C D) D E) E
The type of tissue forming the covering around muscle fibers is:
a. epithelial tissue. b. connective tissue. c. nervous tissue. d. specialized muscle tissue. e. synovial fluid
Which group of Archaea are chemoautotrophic anaerobes that use hydrogen as an electron donor and sulfur compounds as terminal electron acceptors?
A. Thermoacidophiles B. Halophiles C. Methanogens D. Cyanobacteria
Electrons that participate in chemical bonding are typically located closest to the nucleus.
Answer the following statement true (T) or false (F)