In order to measure the step size of kinesin,a group of investigators attached a small silica bead to the tail of a kinesin molecule.What advantage(s)did the attached silica bead provide?
A)The bead made kinesin activity visible.
B)The bead helped to denature kinesin making its properties easier to measure.
C)The bead provided a handle for manipulating and holding the motor using an optical trap.
D)The bead absorbed laser light in a manner proportional to the distance the motor moved.
E)The bead made kinesin activity visible AND provided a handle for manipulating and holding the motor using an optical trap.

Question

Quizplus · Accepted Answer

Attaching a small silica bead to the tail of a kinesin molecule has the advantage of both making kinesin activity visible and providing a handle for manipulating and holding the motor using an optical trap. The bead serves as a visible marker for the movement of the kinesin molecule, and the manipulation and holding of the motor with an optical trap allows for precise measurements of its step size.

In Order to Measure the Step Size of Kinesin,a Group