Which of the following is not true regarding cell migration? Myosin allows contraction of the cell body so the cell will retract forward. Profilin increases polymerization by increasing the rate of nucleotide exchange on actin monomers Microfilaments assemble to push the front end of the cell forward. Cofilin binds to prevent disassembly of microfilaments. Which of the following is required for protein transport from the cytosol to the matrix of the mitochondria? (a) TIM protein (b) TOM protein (c) chaperone protein (hsp 70) (d) Both a and b A, B, and C
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This statement is true as myosin is a motor protein that plays a role in muscle contraction. Show more…
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Which of these statements about muscle cell contraction are true? a. Myosin II molecules have two motor domains and a coiled-coil tail that allows them to assemble into bipolar filaments. b. Motor neurons trigger action potentials in muscle cell membranes that open Ca2+ channels in T-tubules, allowing Ca2+ to enter the cytosol, bind to troponin, and initiate rapid muscle contraction. c. If a muscle cell ran out of ATP and had a high cytoplasmic concentration of Ca2+, all myosin II heads would eventually be associated with actin. d. An increased concentration of cytoplasmic Ca2+ is required for muscle cell relaxation. e. When activated by Ca2+, troponin causes tropomyosin to undergo a shift in position, allowing myosin to access its binding site on the thin filament.
Sana R.
Which of the following statements about myosin are FALSE? A. Myosin cannot bind to actin unless ATP is bound. B. The myosin-actin reaction cycle is powered by ATP hydrolysis. C. The tails of myosin molecules group together to form thin filaments in muscle cells. D. Each myosin head has a binding site for actin and ATP. E. Release of Pi from the myosin causes the "power" stroke that pulls the actin fiber along the myosin fiber.
Bryan V.
Which of the following statements is true? a. A muscle fiber is a collection of cells embedded in connective tissue. b. A sarcomere contains both actin and myosin molecules arranged in a parallel fashion. c. The function of Ca2+ in contraction is to bind to tropomysin. d. Myofibrils are individual muscle cells. e. The I band of a sarcomere is the region where thin and thick filaments overlap.
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