1 Normal 1 No Spak.. Heading 1 Heading2 Te Subtial Paragraph 17 The egg (oma) ha
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1 Normal 1 No Spak.. Heading 1 Heading2 Te Subtial Paragraph 17 The egg (oma) has nmch more complexed cellar stucture. Whch ofthe followmg s NOT a feature of a mammalian ovum? A: It has an envelope called zona pellucida B: It has a cuaukus layer that is important for the development and maturation of the egg C: It has abundant of cilia on the envelope to prevent polyspemay D: It has large amount of cytoplasm 18. Many marine organisms release their eggs into the environment There are several mechanisms for the sperm to meet and fextilize the species-specific egg. Which of the following determine the species-specific fertilization? A: Sperm are attracted to an egg of their own species by following a gradient of a species specific chenical secreted by the egg B: The interaction that triggers acrosoenal reaction is species-specific C: The interaction between the molecules (biadin in sea urchin) on the sperm acrosomal process and their receptors on egg cell membrane is species-specific D: All of the above reaction after the sperm 19. Which of the following is NOT correct about spern actoome touches the surface of an egg? A: It is the activation of cortical granules in egg cells B: It is resulted from the interaction between polysaccharides on sperm membrane and their specific receptors on egg jelly in sea urchin C. It has twro steps the fusion of acrosomal vesicles with the sperm membrane and the formation of acrosomal process D. It happens after the sperm is activated by the chemotactic molecules released by the esExplanation / Answer
17. Option C is the correct answer. Cortical reaction occurs during fertilization by the release of cortical granules from the egg, which prevents polyspermy (fusion of multiple sperm with an egg).
18. Option D is correct. Activation of cortical
19.Option D is the correct answer. Acrosome reaction occurs after touching of sperm to the ovum membrane while releasing of chemotactic molecules by the egg occurs just after releasing of sperm.
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