The cortical reaction of sea urchin eggs is required for which of the following events in fertilization?
A) forming a fertilization envelope B) producing a fast block to polyspermy C) releasing hydrolytic enzymes from the sperm D) generating an electrical impulse from the egg
Which of the following is true about human eggs at the moment of sperm penetration?
A) They use flagellar propulsion to move from the ovary to the oviduct. B) They are still located within the ovary. C) They are covered by a thin layer of calcium carbonate that prevents desiccation. D) They are still surrounded by follicular cells.