14. The formation of the fertilizaion menrane in senh a. prevents polysperiny b.

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14. The formation of the fertilizaion menrane in senh a. prevents polysperiny b. triggers the acrosomal retion e. increases sperm motility d. atracts sperm by chemotasis 15. Gastrulation follows cleavage during animal developasent.Labe eleange te gastrulation varies widely anong animal specles.However,all pator what common feature a. Gastrulation always involves extensive and bighly organied ell mvements end results in formation of embryonle tiesies b. Gastrulation always lovolves rapid eell proliferation c. Gastrulation always resulta in formation of a funetional nerus ye d. New eytoplasmie determinanis always appear during getriletit 16. What could be the reason that a group of cells in one region of s developing endryo does n respond to a diffusible factor released by other cells a short dianee wsy a. They are not "competent, le.don't have the proper reeptor b. the concentration of the factor is too low e, another factor is inhibiting their ability to respond to the firnt facton d. All of the above. 17. Changes in the shape of a cell usually involve a reorganization of th A) nucleus. B) cytoskeleton C) extracellular matrix D) transport proteins. E) nucleolus 18. When you slice up a pie that contains a swirled mixture of chocolate and vanila fiing,you notice that some slices have more chocolate than vanilla and that other slices hav vanilla than chocolate. This uneven distribution of chocolate and vanilla is mont lihe th uneven distribution of A) nuclei in a zygote. B) nuclei in an early embryo. C) cytoplasmic determinants in a newly formed sygote. D) nuclei in an egg prior to fertilization. 19. Hans Spemann and colleagues developed the concept of the primary organizer in amphibian embryos while studying the A) dorsal lip of the blastopore B) anterior terminus of the notochord. C) lateral margins of the neural tube D) posterior edge of the dornal ectoderm

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Answer:

14) The formation of the fertilization membrane in sea urchin

17) Changes in the shape of a cell usually involves a reorganization of the:

18) When you slice up a pie that contains a swirled mixture of chocolate and vanilla filling, you notice that some slices have more chocolate than vanilla and that other slices have more vanilla than chocolate. This uneven distribution of chocolate and vanilla is most like the uneven distribution of:

19) Hans Spemann and colleagues developed the concept of the primary organizer in amphibian embryos while studying the:

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