Which of the following CORRECTLY describes a similarity when comparing actin filaments and microtubules? O Their motor proteins require ATP. O Their disassembly directly requires ATP. O Their assembly directly requires ATP. O Their assembly is faster at the plus end directly because of ATP.
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- ATP within actin subunits is hydrolyzed after assembly into a filament but before disassembly from a filament. in theprocess of assembly into a filament. in the process of disassociation from a filament after disassociation from a filamentWhat would be the consequence for actin filament assembly/disassembly if a mutation prevented actin’s ability to bind ATP? What would be the consequence if a mutation prevented actin’s ability to hydrolyze ATP?Which of the following does NOT limit normal clot growth to the sight of injury? O A) Removal and dilution of clotting factors O B) Fibrin binding to thrombin O C) Antithrombin III D) Exposed collagen fibers O E) Serotonin
- Addition of which of the following would increase the rate of actin depolymerization on the minus end of the filament by dissociating ADP-actin? Othymosin-b4 O cofilin O ATP-G-actin O profilin O Cap ZThe Sarcolemma in skeletal muscle is OA. Equivalent to the cell membrane which covers the entire fiber. OB. A Large multi-nucleated array of myofibrils, essentially one large fused cell. OC. Facilitates mechanical and electrical communication between cells. O D. A specialized form of the endoplasmic reticulum adapted for calcium uptake and release. O E. None of the above.Thick Filaments contain OA. Actin OB. Troponin OC. Tropomyosin O D.Myosin Kinase OE. None of the above
- Hydrolysis of ATP to ADP+P; causes the dissociation of actin from the Myosin head and is called these two stages result in myosin movement along the actin filaments. O Head cocking; treadmilling O Head cocking: power stroke O Power stroke; head cocking Power stroke; treadmilling while the release of P₁ that leads to re-coiling of the myosin head is called Together,Which of the following is NOT true regarding actin? O It contains troponin and tropomyosin O It is a thin myofilament O It's arranged with two heads and a tail O All of these are correctWhich of the following best describes the diagram? A filament of myosin during cross bridge cycling. One motor unit An inactive actin filament The sliding filament theory
- Which of the following statements are true? (choose all that apply) The Z-disc is found in the middle of an l-band Myosin are known as the thick filaments The A-band is seen as "dark" under the microscope Tropomyosin is on the Actin filament During a muscle contraction, the sarcomeres move farther apart A sarcomere is located from one H-zone to the following H-zoneIn a skeletal muscle if calcium levels in the cytosol increase, as calcium is released from the sarcoplasmic reticulum (SR,) how would this affect the position of the actin and myosin filaments? Group of answer choices Calcium released from the SR binds to calmodulin. Calmodulin activates myosin light chain kinase, causing cross bridge formation. Calcium released from the SR binds to troponin, moving tropomyosin and allowing for cross bridge formation. Calcium released from the SR binds to troponin, moving tropomyosin and inhibiting cross bridge formation. Calcium released from the SR binds to troponin, causing actin to detach from myosin. pick one answerSelect the correct description explaining the assembly of intermediate filaments. O The process requires ATP binding to an intermediate filament protein - two dimers make a tetramer, then association of 8 tetramers form a filament. The process requires GTP binding to an intermediate filament protein-two dimers make a tetramer, then association of 8 tetramers form a filament. O No ATP/GTP binding to an intermediate filament protein required - two dimers make a tetramer, then association of 8 tetramers form a filament. Formation of a triple-helix, as seen in collagen, would be required for the assembly of intermediate filaments.