The cortical reaction is triggered by
a. the acrosomal reaction.
b. sperm entering the nucleus.
c. a depolarization event.
d. Ca+ ions.
e. K+ ions
D
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Hemophilia A is an X-linked blood clotting disorder. A normal man and a woman with hemophilia A have a child with Turner Syndrome. This child does not have hemophilia. In whom did non-disjunction occur? In meiosis I or meiosis II?
A. Woman; meiosis I B. Woman; meiosis II C. Man; meiosis I D. Man; meiosis II E. Woman; there is not enough information to tell if the nondisjunction happened in meiosis I or II
Identify the true statement about exotoxins.
A. They are structural proteins on the exterior surface of bacteria. B. They nonspecifically activate host complement and coagulation cascades. C. They bind to specific receptors on host cells. D. They promote bacterial adhesion
Of the following four islands at the same latitude, which one likely possesses the fewest species?
A. 1,000 square kilometers in area and 300 km from the mainland B. 3,000 square kilometers in area and 100 km from the mainland C. 100 square kilometers in area and 3,000 km from the mainland D. 300 square kilometers in area and 1,000 km from the mainland E. All islands are at the same latitude, so they are all likely to have the same species richness.
True or False: Complement factor C3b coats a bacterium and binds to C3b receptors on phagocytes, making the bacterium more susceptible to being phagocytized.
What will be an ideal response?