Arrange the steps of an allergic reaction in the proper order
1) allergic symptoms appear
2) allergin binds with IgE
3) IgE combines with mast cell receptors
4) mast cell releases 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
A
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Which of the following is true about two-dimensional gel electrophoresis?
A. The first dimension separates proteins based on their size. B. The second dimension separates proteins based on their isoelectric point (pI). C. The first dimension separates proteins based on their density. D. The second dimension separates proteins based on their size. E. The second dimension separates proteins based on their charge.
Answer the following statements true (T) or false (F)
1. Chicken eggs form a blastula through holoblastic cleavage. 2. One outcome of gastrulation is the establishment of primordial germ cells, which represent the cell types that form gametes. 3. Convergent extension, involution, and invagination are ways in which cells move and transform within the embryo. 4. The differentiation of cells into distinct body parts is induced by morphogens.
Which of the following is an action of ricin?
a. binding to carbohydrates on the plasma membrane b. removal of an adenine base from rRNA c. ribosome inactivation d. none of these are actions of ricin e. all of these (except d) are actions of ricin
Anthropoids or higher primates include all of the following except
A. Old World monkeys. B. humans. C. New World monkeys. D. lemurs. E. apes.