The function of the secretory component of the IgA molecule is
A. to protect IgA from being destroyed by proteolytic enzymes.
B. to coat the antigen.
C. opsonization.
D. to fix IgA to the antigen.
A
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Which of the following defines the competitive exclusion principle?
a. Different species cannot co-exist when competing for the same resources. b. Symbiotic relationships between species take time to develop. c. Mutualism ensures that different species benefit from interacting. d. Only the foundation species in a habitat will survive with limited resources.
Tundie is an accomplished lab technician. She wants to determine whether her boyfriend is still smoking marijuana, a habit he swore he would give up
She can't test his blood for THC because performing this test might arouse the suspicions of the authorities. Which of the following blood findings might suggest that her boyfriend is still smoking weed? A) substantial nicotine in the blood B) increased blood carbon monoxide C) low blood oxygen D) high blood niacin
A cell that uses an organic carbon source and obtains energy from light would be called a
A. photoheterotroph. B. lithoautotroph. C. photoautotroph. D. chemoheterotroph. E. chemoautotroph.
The inheritance pattern in which the mother provides gene products to the developing egg cells is called
A. X inactivation. B. extranuclear inheritance. C. genomic imprinting. D. linkage. E. maternal effects.