Consider a culture medium on which only gram-positive organisms such as Staphylococcus aureus colonies can grow due to an elevated NaCl level. A yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the pH as a result and changing the color of a pH indicator chemical. This type of medium would be referred to as a(n)
A) selective medium.
B) differential medium.
C) enrichment culture.
D) selective and differential medium.
E) differential and enrichment culture.
D
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Cancer cells
A) divide uncontrollably and then die. B) are particularly sensitive to extracellular signals. C) are dedifferentiated. D) are impossible to grow in culture.
A sign is
A. measurable by health care personnel. B. a subjective indication of disease. C. malaise and body aches. D. an objective indication of disease. E. an objective indication of disease that is measurable by health care personnel.
Diffusion of molecules through channels and facilitated transport are types of ________ transport
Fill in the blank(s) with correct word
Why are mitochondria present in the sperm?
a. to provide energy for the movement of the flagellum b. to provide energy for the acrosome to penetrate the egg c. to provide nutrients for the sperm d. to provide nutrients for the developing embryo e. to provide energy for the maturation of the sperm