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Exam (elaborations)

OSSF Cytoskeletal proteins Questions and Answers 2024/2025

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What are the 3 primary types of protein filamanets?  Actin microfilaments, intermediate filaments, microtubules What is the thinnest, most flexible component of the cytoskeleton?  Actin filaments What are actin filaments made of?  Globular actin monomers with their own ATP binding sit...

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  • October 11, 2024
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OSSF Cytoskeletal proteins Questions
and Answers 2024/2025
What are the 3 primary types of protein filamanets?

 Actin microfilaments, intermediate filaments, microtubules


What is the thinnest, most flexible component of the cytoskeleton?

 Actin filaments


What are actin filaments made of?

 Globular actin monomers with their own ATP binding site


What end of an actin filament is growing?

 Plus end


What are hollow, nonbranching cylinders made of 13 parallel protofilaments?


 Microtubules


What is at the minus end of microtubules?

 Alpha tubulin


What is at the plus end of microtubules?

 Beta tubulin


What are each beta tubulin of microtubules bound to?




1|Page| GradeA+ | 2 0 0 2 5

, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 GTP


What end of microtubules is growing?


 Plus end


What is the anchoring site where actin filaments and microtubules grow from?

 Nucleation site


Where is the nucleation site for acting molecules?

 Plasma membrane


Where is the nucleation site for microtubules?


 Microtubule organizing centers (MOC)


The binding of subunits causes hydrolysis of ATP (actin) or GTP (microtubules) and decreases

the strength of binding causing...

 Dynamic instability


Which end do the ATP/ GTP molecules dissociate from?

 Minus end


What provides a stronger, stable actin structure?


 Bundling proteins together


What regulates shape and number of actin filaments and microtubules through altering the

number of regulatory proteins?

1|Page| GradeA+ | 2 0 0 2 5

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