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Could it be that lineage-restricted multipotent stem cells are derived from a
cNeoblast and seeded throughout the
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- How important is cell adhesion for the development of mammalian embryo?Explain why E is the correct choice. Various types of stem cells that develop from the mesoderm are involved in processes by which all cells of the protostomes and Deuterostomes obtain or regulate ions, molecules, or monomers (nutrients). Therefore, these cells will perform which of the following processes? a) Osmosis, b) active transport, c) facilitated diffusion, d) exocytosis, e) all are correct.An additional notochord is grafted next to the developing neural tube. Answer the following questions. (a) what new cells would you expect to develop in the region of the neural tube closest to the graft? (b) What is the notochord-derived molecule that is responsible for the effect?
- Which of the following is NOT true when comparing epithelial and mesenchymal cells. A) Epithelial and mesenchymal cells differ in their DNA content. B Epithelial and mesenchymal cells secrete different types of extracellular matrix molecules. C Epithelial cells are stationary whereas mesenchyme cells are motile. D Mesenchymal cells can invade tissues to form organs in new places. E) Epithelial cells express a different type of cadherin than mesenchymal cell.Which of the following are stages in the cytokinesis of animal cells? Select all that apply. A) The cell plate expands along the plane of division, and when the plate fuses with the plasma membrane, the cytoplasm is partitioned into two new cells. B)After telophase, the contractile ring constricts the plasma membrane and forms a cleavage furrow. C)The contractile ring reaches its smallest diameter, and the spindle microtubules are cut as vesicles form the new membranes that separate the two new cells. D)A contractile ring of microfilaments and motor proteins forms under the plasma membrane during anaphase.Which of the following are stages in the cytokinesis of animal cells? Select all that apply. A) The cell plate expands along the plane of division, and when the plate fuses with the plasma membrane, the cytoplasm is partitioned into two new cells. B) After telophase, the contractile ring constricts the plasma membrane and forms a cleavage furrow. C) The contractile ring reaches its smallest diameter, and the spindle microtubules are cut as vesicles form the new membranes that separate the two new cells. D) A contractile ring of microfilaments and motor proteins forms under the plasma membrane during anaphase.Assessment question
- I am confused about how stem cell transplants works. If you put a semi differentiated tadpole nucleus in a denucleated egg cell, it’ll develop into a fully formed tadpole, but if you put a fully differentiated tadpole nucleus, it won’t (because the genes have already been expressed in a way where the cytoplasmic determinants cannot operate to the fullest). Then how come in stem cell transplants, you use adult nucleuses that are already developed and transplant them into the denucleated egg cells?Describe the three basic steps in the formation and fusion of autophagosomes.What is a contig?