Gastrulation in a mammal would be most similar to gastrulation in a. a gecko. b. a tuna. c. an eagle. d. no other species; mammalian gastrulation is unique
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| Gastrulation in a mammal would be most similar to gastrulation in |
| a. a gecko. |
| b. a tuna. |
| c. an eagle. |
| d. no other species; mammalian gastrulation is unique |
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- Which of the following statements is false? a. Cadherins, but not integrins play a role in gastrulation. b. Gastrulation creates the primary germ layers c. Gastrulation requires cells to change their gene expression. d. Body axes are stabilized (made permanent) during gastrulation.If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface of a second gastrula where skin would normally develop, the transplanted cells will still develop into tissues of the nervous system. This experiment shows that the transplanted cells areA. differentiated.B. totipotent.C. discontinuous.D. determined.E. endodermal.Internal and external fertilization differ in that species thata. produce an amniotic egg have internal fertilization.b. without an amniotic egg have external fertilization.c. produce live young have mammary glands.d. lay eggs are external fertilizers
- Which of the following statements about gastrulation is correct? A. During gastrulation, the contents of cell nuclei begin to vary so that they can start to perform different fucntions. B. During gastrulation, cells differentiate so that they can start to perform different functions. C. The formation of the endoderm, mesoderm, and ectoderm occurs after gastrulation. D. The formation of the endoderm, mesoderm, and ectoderm occurs before gastrulation.The embryos of complex multicellular animals must establish spatial coordinates if development is to proceed. An important reference coordinate for developing frogs is theA. location of the vegetal pole.B. location of the animal pole.C. point of sperm penetration.D. location where gastrulation begins.E. direction of the sun.Which of the following organisms would NOT undergo gastrulation? a. fungi and sponges b. worms and snails c. nematodes d. those with only one opening for food and waste (protostomes)
- The zona pellucida is important in mammals because it... a. induces polyspermy. b. induces compaction. c. inhibits implantation of the embryo until the embryo reaches the uterus. d. inhibits the formation of twins.Observation of the development of embryos in sea stars shows the mesoderm forming pouches bulging from the archenteron to form the coelom. From this observation, you can predict that A. the cleavage of the embryo is radial. B. the adult animal will have bilateral symmetry. C. the mouth forms from the first opening in the gastrula. D. the animal is diploblastic.The cells that give rise to gametesa. are derived from the mesoderm.b. often arise independently from the three germ layers.c. originate directly from the tissue that will develop into thegonads.d. are some of the last cells of the embryo to differentiate.e. are formed the same way in all animals.
- During morphogenesis, gastrulation does which of the following?A. Gastrulation produces the ectoderm through formation of a blastocyst.B. Gastrulation produces the mesoderm to form the lining of the digestive tract.C. Gastrulation provides the mechanisms whereby cells can form the neural tube.D. Gastrulation produces the endoderm through invagination of the blastula.In the development of the nervous system, one of the following is false? O a. The neural tube maintains temporary contact with the yolk sac cavity via neuropores. O b. The neural tube develops from ectoderm. O c. The neural groove forms from the neural plate. d. The neural folds are composed of neuroectoderm cells. e. The ectoderm fuse to cover the neural crest & the neural tube is the surface ectoderm. Clear my choiceIn the development of the nervous system, one of the following is false? The neural tube maintains temporary contact with the yolk sac cavity via neuropores. O a. O b. The neural tube develops from ectoderm. O c. The neural groove forms from the neural plate. d. The neural folds are composed of neuroectoderm cells. O e. The ectoderm fuse to cover the neural crest & the neural tube is the surface ectoderm Clear my choice marks Jump to... ©2020 SKITCE-AQU/Powered by Moodle A https://www.alguds.edu eclass@alguds.edu