What is the direction of travel for a vesicle being transported from cell body to axon terminal, and what molecule is responsible for transport? Select one:
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What is the direction of travel for a vesicle being transported from cell body to axon terminal, and what molecule is responsible for transport?
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- Draw a pair of antiparallel microtubules across the page. The following should be clarified or added: a. plus and minus ends clearly denoted on both microtubules b. the fact that each microtubule is a polymer of alpha+beta heterodimers must be denoted (with correct orientation) c. one microtubule is bound by a simple representation of plus-end directed motor protein. The motor protein should be named and representation indicates which direction it moves. d. one microtubule is bound by a simple representation of minus-end directed motor protein. The motor protein should be named and representation indicates which direction it moves.What is cytokinesis? What structure can be seen in cytokinesis of a plant cell? What structure can be seen in cytokinesis of an animal cell?Name the dark, linear, thread-like structures that you can see in some of the onion root tip cells. What Biomolecule of heredity do they contain?
- Transferrin is transmembrane glycoprotein, which mediates the transport of iron. Which of the following shows the correct route for the production of this membranous protein? O a. Smooth ER, Golgi apparatus, transport vesicles, Lysosome O b. Rough ER, Golgi apparatus, vacuoles, plasma membrane O c. Smooth ER, Golgi apparatus, vacuoles, plasma membrane O d. Smooth ER, Golgi apparatus, transport vesicles, plasma membrane O e. Rough ER, Golgi apparatus, transport vesicles, plasma membraneMalcolm Steinberg tested this hypothesis by putting two cell types in a Petri dish and watching how they sorted: a. how did the sorting pattern that supported cell adhesion being the force of cell sorting differ from that of "directed movement" (i.e., cells independently were directed to move inward --in that direction)? (can draw pattern or describe in words) b. He could have tested it another way--by inhibiting or knocking down cadherins (cell adhesion molecules) with a chemical or by using CRISPR/CAS9--if he did, what do you predict cells would do when placed in a Petri dish? (can draw this outcome or describe in words)Many common medications function by interrupting the normal operation of certain signal transduction pathways. Which of the following describes a possible mechanism by which a certain medication may interrupt a signal transduction pathway? A A medication enters the target cell and triggers apoptosis by causing the release of di- gestive enzymes from cell lysosomes. B A medication interacts with the phospholipid bi-layer of the cell membrane and in- creases its permeability. с D A medication binds to membrane-bound glucose proteins and acts as an allosteric in- hibitor that prevents the intake of glucose by the cell. A medication diffuses through the membrane of a target cell and inhibits an enzyme that normally synthesizes a second messenger.
- Cell motility has been described as being like the motion of tank treads. At the leading edge, actin filaments form rapidly into bundles and networks that make protrusions and move the cell forward. At the rear, cell adhesions are broken and the tail end of the cell is brought forward. What provides the traction for moving cells? How does cell-body translocation happen? How are cell adhesions released as cells move forward?Select the most accurate explanation for how vesicular transport occurs when a receptor is moving from the plasma memberane to the late endosome/lysosome. A. Endosomes containing the receptor are transported by myosin II walking towards the minus end of microtubules. Endosomes are targeted to the late endosome/lysosome by Rab and SNARES facilitate membrane fusion. B. Endosomes containing the receptor are transported by myosin V walking towards the minus end of microtubules. Endosomes are targeted to the late endosome/lysosome by Rab and SNARES facilitate membrane fusion. OC. Endosomes containing the receptor are transported by dyenin walking towards the minus end of microtubules. Endosomes are targeted to the late endosome/lysosome by Rab and SNARES facilitate membrane fusion. D. Endosomes containing the receptor are transported by kinesin-13 walking towards the plus end of microtubules. Endosomes are targeted to the late endosome/lysosome by clathrin and SNARES facilitate membrane…Which of the following are stages in the cytokinesis of animal cells? Select all that apply. After telophase, the contractile ring constricts the plasma membrane and forms a cleavage furrow. A contractile ring of microfilaments and motor proteins forms under the plasma membrane during anaphase. 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. 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.
- In carrying out a pulse-chase experiment, radiolabel appears first over the ER in the basal portion of the cell. It moves next to the Golgi apparatus located centrally. Next, the radiolabel appears in the cell's apical region near a number of small cytoplasmic vesicles. What kind of cell is this?Which of the following statements about the M cyclin:CDK are FALSE: It promotes nuclear envelope assembly at the end of M phase It phosphorylates the APC/C to activate it It phosphorylates microtubule binding proteins to promote spindle formation Its activity is regulated by phosphorylationWhich 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.