(17%) Problem 6: In a study of the forces involved when motor proteins move subcellular structures...

 

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(17%) Problem 6: In a study of the forces involved when motor proteins move subcellular structures in cells, Shtridleman et al.* studied the motion of objects in living cells. In this paper, they extracted the position of a vesicle using video. Some of the frames are shown in the figure at the left below and a graph of the position of one of the vesicles that moved along a straight line (in a direction they call y) is shown at the right. t=0s t=2s t=4s t=6s y (m) 2 199 6 B A 2 4 t(s) 6 F E Six instants of time are identified on the graph at the right and labeled by the letters A through F. Assuming that a smoothed model of the motion is appropriate for understanding the forces involved, choose the letter for the instant of time that would represent the events labeled in parts (a) through (d) below. *Force-Velocity Curves of Motor Proteins Cooperating In Vivo, Y. Shtridelman, et al., Cell Biochem Biophys. 52(1): 19-29 17% Part (a) The instant of time at which the vesicle is moving with the highest speed. A F C B E D Submit Hint Feedback I give up! Hints: 0 for a 0% deduction. Hints remaining: 0 Feedback: 0% deduction per feedback. 17% Part (b) The instant of time at which the vesicle is moving with the slowest speed. 17% Part (c) The instant of time at which the vesicle feels net force of the largest magnitude. A 17% Part (d) The instant of time at which the magnitude of the vesicle's acceleration is the largest. 17% Part (e) For the parts (e) and (f) choose the item that is the best match. The instantaneous speed at instant D 17% Part (f) The average speed between t = 0 and D Grade Summary Deductions Potential 0% 100% Late Work % 60% Late Potential 60% Submissions Attempts remaining: (20% per attempt) detailed view 5 (17%) Problem 6: In a study of the forces involved when motor proteins move subcellular structures in cells, Shtridleman et al.* studied the motion of objects in living cells. In this paper, they extracted the position of a vesicle using video. Some of the frames are shown in the figure at the left below and a graph of the position of one of the vesicles that moved along a straight line (in a direction they call y) is shown at the right. t=0s t=2s t=4s t=6s y (m) 2 199 6 B A 2 4 t(s) 6 F E Six instants of time are identified on the graph at the right and labeled by the letters A through F. Assuming that a smoothed model of the motion is appropriate for understanding the forces involved, choose the letter for the instant of time that would represent the events labeled in parts (a) through (d) below. *Force-Velocity Curves of Motor Proteins Cooperating In Vivo, Y. Shtridelman, et al., Cell Biochem Biophys. 52(1): 19-29 17% Part (a) The instant of time at which the vesicle is moving with the highest speed. A F C B E D Submit Hint Feedback I give up! Hints: 0 for a 0% deduction. Hints remaining: 0 Feedback: 0% deduction per feedback. 17% Part (b) The instant of time at which the vesicle is moving with the slowest speed. 17% Part (c) The instant of time at which the vesicle feels net force of the largest magnitude. A 17% Part (d) The instant of time at which the magnitude of the vesicle's acceleration is the largest. 17% Part (e) For the parts (e) and (f) choose the item that is the best match. The instantaneous speed at instant D 17% Part (f) The average speed between t = 0 and D Grade Summary Deductions Potential 0% 100% Late Work % 60% Late Potential 60% Submissions Attempts remaining: (20% per attempt) detailed view 5