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- Which of the following is/are required in order for an endosome to be transported from the plasma membrane to the Golgi complex? (Select all that apply!) Dynein Kinesin ATP Microtubules Actin GTP MyosinWhich of the following properties are shared by desmosomes and hemidesmosomes? Select all that apply. They both are protein structures found in eukaryotic cells They both bind extracellular matrix proteins They both bind to intermediate filaments They both bind to acti filamentshich of the following statements is true about actin: OActin is translated by free ribosomes O Dyneins move toward the minus end of actin filaments actin can bind to GTP O actin filament is stabilized by ADP-binding
- Integrins are important in cell crawling because they anchor the leading edge of the cell to the surface it is moving over they are receptors for diffusible chemical ligands that determine the direction the cell will move in they cross-link actin filaments to microtubules and intermediate filaments of the cytoskeleton they serve as nucleating sites for polymerization of new actin filamentsNeurons have long thin processes called axons, structuresspecialized for conducting signals throughout the organism’s nervous system. Some axonal processes can be as long as 2 m—for example, the axons that originate in your spinal cord and terminate in the muscles of your toes. Small membrane-enclosed vesicles carrying materials essential to axonal function move along microtubules of the cytoskeleton, from the cell body to the tips of the axons. If the average velocity of a vesicle is 1 μm/s, how long does it take a vesicle to move from a cell body in the spinal cord to the axonal tip in the toes?What is a common feature of the voltage sensitive Ca++, Na+ and K+ ion channels? A single polypeptide sequence made up of 4 domains A voltage sensing S4 transmembrane domain A transmembrane S5-S6 hydrophobic subunit that binds the membrane A voltage sensing extracellular P loop
- Which of the following adapter proteins or protein pairs connects the actin filaments with the extracellular matrix? Ezrin Dystrophin/Dystroglycan complex Band 4.1/Glycophorin C O Band 3/Ankyrin < PreviousSelect the correct statement regarding the actin cytoskeleton. They are involved in the formation of the axoneme. Actin microfilaments are the most stable cytoskeleton network. Can undergo catastrophe due to GTP hydrolysis-mediated conformational changes. Synthesis and degradation of actin microfilaments is directional, with g-actin subunits added only to the + end of the microfilament while depolymerization occurs at the - end. From the list below, select the correct statements regarding the genetic code. Codons code for 30 distinct amino acids. The basis of the genetic code are codons. The genetic code has a possible 64 different codons. The genetic code has built-in degeneracy. Codons are formed by 5 consecutive nucleotides.The protein collagen is manufactured and secreted by skin cells. Collagen provides strength and elasticity between cells. What would be the result if during the manufacture of collagen, there was a defect in its ER signal? (Select all) Question 8 options: The primary structure would never get completed. The primary structure would get completed but the secondary and tertiary structures would not be completed. The malformed collagen would end up exiting the cell. The malformed collagen would end up in the cytoplasm. The malformed collagen would end up in a vesicle.
- Answer the following question in few paragraphs: The actual network and the microtubule network within a cell display very similar assembly kinetics yet has drastically different mechanisms that regulate the dynamics of the individual networks. Compare and contrast the dynamics, both assembly and disassembly, of Actin and microtubules. Be sure to elaborate why these distinctions exist.Microtubules are important for transporting cargo in nerve cell axons, as diagrammed in Figure Q17- 33. Notice that the two types of cargo are traveling in opposite directions. Which of the following statements is likely to be false? cell body microtubule axon Figure Q17-33 inward transport axon terminal The black cargo and the gray cargo require ATP hydrolysis for their motion. The gray cargo is attached to dynein. outward transport The black cargo and the gray cargo are moving along microtubules of opposite polarity. The black cargo moving toward the axon terminal contains a domain that specifically interacts with the tail domain of a particular kind of motor.The abundant intercellular connections gab junction can be found in O diaphragm O Heart muscle O Skeletal muscle O Smooth muscle