What is the central purpose of aseptic technique?
A) To identify pathogenic bacteria
B) To prevent the spread of contamination
C) To cure disease
D) To find new antibiotics
B) To prevent the spread of contamination
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Many organisms grow in areas where sun and nutrition sources are poor, such as the hydrothermal vents at the bottom of the ocean. By what process do these organisms make their own food?
a. photoautotrophy b. diffusion c. chemoautotrophy d. predation
What is at the center of a heme molecule in a hemoglobin protein?
a. a beta globin chain b. an alpha globin chain c. iron d. nitrogen e. another heme molecule
Mechanisms that prevent mating between species are called ________ isolating mechanisms
Fill in the blank(s) with correct word
The drug metronidazole is effective on both bacteria and some protozoa. It can therefore be described as a ________ drug.
A. narrow spectrum B. broad spectrum C. full spectrum D. general spectrum E. specific spectrum