profilin in a molecular motor profilin is a promoter of actin polymerization profilin replaced G-actin in an F-actin strand and breaks the filament profilin is an inhibitor of actin polymerization profilin binds to G-actin, preventing it from polymerizing

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Please help me with this question. More than one answer may be correct. THe graph relating to the information is included below.

The above figures show the rate of actin polymerization in the presence of various concentration of profilin (Pfn).  In the top figure, flourescence intensity is a measure of total actin that has been polymerized, and this is plotted versus time in seconds.  The shade of blue of the lines in the top figure correspond to the shaded blue bars representing various concentrations of profilin in the lower figure. The lower graph shows the initial rates of polymerization of actin plotted again concentration. Which of the following is true:

Question 21 options:

profilin in a molecular motor


profilin is a promoter of actin polymerization


profilin replaced G-actin in an F-actin strand and breaks the filament


profilin is an inhibitor of actin polymerization


profilin binds to G-actin, preventing it from polymerizing

fluorescence intensity
relative initial rate
20000
15000-
10000-
5000-
0+
0
1.0-
0.8-
0.6-
0.4-
0.2-
0.0-
600 1200 1800
t (s)
2400 3000 3600
4
10
15
Pfn concentration (UM)
20
Transcribed Image Text:fluorescence intensity relative initial rate 20000 15000- 10000- 5000- 0+ 0 1.0- 0.8- 0.6- 0.4- 0.2- 0.0- 600 1200 1800 t (s) 2400 3000 3600 4 10 15 Pfn concentration (UM) 20
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