Lactose intolerance
A) is common in people of all ages, from infancy to adulthood.
B) is most common in people of European descent.
C) can currently be treated by gene therapy to treat the underlying cause.
D) does not affect the consumption of beverages made from soy or rice.
Answer: D
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What is thought to be responsible for the worldwide deaths of corals and their endosymbiotic algae?
a. ocean acidification b. nitrogen fixation c. soil runoff d. declining primary productivity e. depletion of oxygen in the oceans
With second exposure to the antigen, the antigen molecules bind to:
A. IgE on the helper T cells B. IgE on the mast cells C. IgE on the plasma cells D. IgE on the antigen-presenting cells
The method by which cell components are separated by centrifugation at progressively higher speeds is called _______ centrifugation.
a. differential b. velocity c. density-gradient d. equilibrium
Which vein in the body carries oxygenated blood?
A) pulmonary vein B) inferior vena cava C) Veins never carry oxygenated blood. D) superior vena cava E) coronary vein