The gradient distributions of alleles across continents reflect _____
a. the delineation of new races
b. genetic drift
c. human migration patterns
d. protective alleles
e. natural selection
c
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The middle layer of membranes surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.
In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin. Which of the following descriptors does not apply to Trichophyton?
A. Saprobe B. Parasite C. Eukaryote D. Heterotroph
Disease in which a person's immune system attacks a person's own cells is known as
A. immunodeficiency diseases. B. autoimmune diseases. C. allergic reactions. D. rejection responses.
In eukaryotes, photosynthesis takes place inside ________.
A. the cytoplasm B. mitochondria C. central vacuoles D. chloroplasts E. the Golgi apparatus