In the following graph, the elongation rate of pure actin filaments as a function of actin subunit concentration is shown as a dashed line. Which one of the other five lines (A to E) would you think better shows what happens when a plus-end capping protein such as CapZ is present?

Question

Quizplus · Accepted Answer

With pure subunits, the (dashed) line represents the overall growth rate (i.e. at both ends) of the actin filaments. Addition of a plus-end capping protein suppresses the contribution of the plus end to the overall growth, leading to a slower growth and a higher overall Cc that is close to that of the minus end.

In the Following Graph, the Elongation Rate of Pure Actin