Motor proteins use the energy in ATP to transport organelles, rearrange elements of the cytoskeleton during cell migration, and move chromosomes during cell division
Which of the following mechanisms is sufficient to ensure the unidirectional movement of a motor protein along its substrate?
(a) A conformational change is coupled to the release of a phosphate (Pi).
(b) The substrate on which the motor moves has a conformational polarity.
(c) A conformational change is coupled to the binding of ADP.
(d) A conformational change is linked to ATP hydrolysis.
(d)
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Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 × 107 cells per ml?
A. 4 hours B. 3 hours C. 2 hours D. 1 hour
Once inside an erythrocyte, the Plasmodium begins to enlarge as a uninucleate cell called a ________.
A. sporozoite B. trophozoite C. schizont D. merozoite
The knee is ________ to the foot.
Fill in the blank(s) with the appropriate word(s).
Blood pressure depends on:
a. the height and weight of an individual. b. atrial volume and stroke rate. c. blood flow and resistance of blood against the vessel walls. d. total blood volume. e. heart rate.