Why are the ends of microfilaments and microtubules called "plus ends" and "minus ends"?
A. because monomers are added more
quickly to one end (the "plus end") than they
are to the other end (the "minus end")
B. because polymerization occurs at one end
(the "plus end") and depolymerization occurs
at the other end (the "minus end")
C. because monomers can be added to one
end only (the "plus end"), and can only be
removed from the other end (the "minus end")
D. because the actin and tubulin monomers
that make up microfilaments and
microtubules have evolved more rapidly than
most other proteins
A
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