The three main energetic components of sunlight are
A. gamma rays, visible light, and infrared radiation.
B. visible light, radio waves, and ultraviolet radiation.
C. ultraviolet radiation, visible light, and x-rays.
D. ultraviolet radiation, visible light, and infrared radiation.
E. microwaves, visible light, and ultraviolet radiation.
D. ultraviolet radiation, visible light, and infrared radiation.
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Which of the following adds RNA nucleotides, one at a time, during transcription?
a. RNA polymerase b. DNA polymerase c. RNA nuclease d. transfer RNA e. ribosomal RNA
Which of the following are found in the nucleus of an atom?
A) electrons and neutrons B) neutrons and protons C) protons and electrons D) neutrons, electrons, and protons
Pseudomonas aeruginosa produces a two-part exotoxin. The most likely pathologic effect of this toxin is
a. Inhibition of protein synthesis. b. Flaccid paralysis. c. Tetani or lockjaw. d. A red rash. e. The bacteria will be able to grow in phagocytes.
Which of the following substances stimulates the phagocytic activity of phagocytes?
A) gamma interferons B) alpha interferons C) beta interferons D) antiviral proteins E) leukotrienes