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Which statements are true? Explain why or why not.1 The role of ATP hydrolysis in actin polymerizationis similar to the role of GTP hydrolysis in tubulin polym-erization: both serve to weaken the bonds in the polymerand thereby promote depolymerization.2 Motor neurons trigger action potentials in musclecell membranes that open voltage-sensitive Ca2+ channelsin T tubules, allowing extracellular Ca2+ to enter the cyto-sol, bind to troponin C, and initiate rapid muscle contrac-tion.3 In most animal cells, minus-end directed microtu-bule motors deliver their cargo to the periphery of the cell,whereas plus-end directed microtubule motors delivertheir cargo to the interior of the cell.

Which statements are true? Explain why or why not.1 The role of ATP hydrolysis in actin polymerizationis similar to the role of GTP hydrolysis in tubulin polym-erization: both serve to weaken the bonds in the polymerand thereby promote depolymerization.2 Motor neurons trigger action potentials in musclecell membranes that open voltage-sensitive Ca2+ channelsin T tubules, allowing extracellular Ca2+ to enter the cyto-sol, bind to troponin C, and initiate rapid muscle contrac-tion.3 In most animal cells, minus-end directed microtu-bule motors deliver their cargo to the periphery of the cell,whereas plus-end directed microtubule motors delivertheir cargo to the interior of the cell.

Human Anatomy & Physiology (11th Edition)
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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Which statements are true? Explain why or why not.
1 The role of ATP hydrolysis in actin polymerization
is similar to the role of GTP hydrolysis in tubulin polym-
erization: both serve to weaken the bonds in the polymer
and thereby promote depolymerization.
2 Motor neurons trigger action potentials in muscle
cell membranes that open voltage-sensitive Ca2+ channels
in T tubules, allowing extracellular Ca2+ to enter the cyto-
sol, bind to troponin C, and initiate rapid muscle contrac-
tion.
3 In most animal cells, minus-end directed microtu-
bule motors deliver their cargo to the periphery of the cell,
whereas plus-end directed microtubule motors deliver
their cargo to the interior of the cell.

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