Class notes
phgy 170 learning outcomes assignment 8
- Course
- PHGY 170
- Institution
- Queen’s University (QU )
phgy 170 learning outcomes assignment 8
[Show more]
Seller
Follow
Content preview
PHGY 170 - Learning Outcomes Assignment 81. What are the functions of the cytoskeleton? (2 points)
The cytoskeleton is a network made up of structural proteins that is found in all types of cells.
One function of the cytoskeleton is allowing common cellular functions, like signalling and
vesicular transport to occur, and giving some cells their unique properties like cell motility. The
cytoskeleton is also responsible for defining the shape of the cell and distributing cellular
contents.
2. What are the roles of the intermediate filaments, microtubules, and actin filaments
within cells? (3 points)
Intermediate Filaments:
● These filaments supply the strength to cells that allows them to resist changes of shape,
providing mechanical strength to cells.
Microtubules:
● Support trafficking within cells (movement of proteins, vesicles, and cellular organelles
in the cytoplasm).
● They define how components are trafficked in the cytoplasm, and define routes for cargo
travel.
Actin Filaments:
● Form a strong network that contributes to the structure of cells and large scale movement
like muscle contraction.
3. Compare and contrast the assembly of intermediate filaments, microtubules, and actin
filaments. (6 points)
Intermediate Filaments:
2 coiled monomers join together to form a dimer, 2 dimers join together to form a tetramer.
● Stage 1: until-length filaments are formed by 8 tetramers joining together.
● Stage 2: these unit-length filaments join together forming immature filaments.
● Stage 3: intermediate filament compacts forming a mature filament.
Microtubules:
In contrast with intermediate filaments, assembly is more organized and doesn’t happen
spontaneously. Requires a number of proteins and happens in the microtubule organizing centres
(MTOCs).
● Stage 1: formation of microtubules from a-b tubulin dimers is dynamic.
● Stage 2: if the polymer reaches a critical length, they’ll continue to grow.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller queensu2022. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.48. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
84866 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now