The only immunoglobulin class with members able to cross the placental barrier is ________.
A. IgM
B. IgA
C. IgE
D. IgG
Answer: D
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The mutation frequency is the ratio of the number of mutant alleles to the total number of alleles in a given population
Indicate whether the statement is true or false
Arrange the steps of an allergic response in the proper order
1) Allergic symptoms appear. 2) Allergen binds with IgE. 3) IgE combines with mast cell receptors. 4) Mast cells release histamine. 5) Plasma cells sensitized.
a. 5, 3, 2, 4, 1 b. 1, 5, 2, 4, 3 c. 5, 2, 4, 3, 1 d. 1, 4, 5, 2, 3 e. 4, 5, 2, 3, 1
As the size of the wolf population in Yellowstone National Park has increased, many wolves have migrated from the park into areas around the park. This migration is the result of
A. population pressure. B. sex ratio changes. C. natality. D. gene frequency changes.
Both T3 and T4 are produced in the thyroid and are responsible for increasing the metabolic rate of specific organs in the body.
Answer the following statement true (T) or false (F)