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14 Questions

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Microfilaments Structure and Function

Created by

@MesmerizedElder

Questions and Answers

What is the key difference between intermediate filaments and microtubules/microfilaments?

Their dynamic nature (correct)

Their function

Their location in the cell

Their composition

What is the primary function of intermediate filaments?

To regulate cell growth and division

To facilitate cell movement and migration

To provide structural support and resist mechanical stress (correct)

To provide mechanical stress to the cell

How do intermediate filaments respond to mechanical stress?

They stretch and then return to their original shape (correct)

They dissolve and are replaced

They change direction to avoid the stress

They break and reform

What is a common analogy used to describe the function of intermediate filaments?

Springs in a mattress Signup and view all the answers

How do microtubules and microfilaments differ from intermediate filaments?

They are more dynamic and constantly change Signup and view all the answers

What is the outcome when intermediate filaments resist mechanical stress?

The cell maintains its shape Signup and view all the answers

What are microfilaments composed of?

Actin proteins Signup and view all the answers

What is the process called when actin molecules join together to form an actin polymer?

Actin polymerization Signup and view all the answers

What is the main function of microfilaments in a cell?

Involving in the gross movement of the cell Signup and view all the answers

What happens to microfilaments during cell division?

They help the cell to pinch and divide Signup and view all the answers

What is the function of microfilaments in an amoeba?

To help the cell move and capture food Signup and view all the answers

What is unique about intermediate filaments compared to microtubules and microfilaments?

They are made up of many different types of proteins Signup and view all the answers

What is the process called when actin polymers shorten?

Actin depolymerization Signup and view all the answers

How do microfilaments move in a cell?

Through actin polymerization and depolymerization Signup and view all the answers

Study Notes

Microfilaments

Found in the cytoplasm and composed of a protein called actin
Many actin molecules join together to form an actin polymer, which then twist around each other to form an actin filament
Mainly involved in the gross movement of the cell
Dynamic, meaning they can lengthen and shorten frequently through actin polymerization and depolymerization
Examples of microfilaments in action include:
- Helping cells pinch and separate during cell division
- Enabling amoebas to extend pseudopods and capture food

Intermediate Filaments

Made up of many different types of proteins strung together into polymers
These polymers twist together to form intermediate filaments
Permanent structures, unlike microtubules and microfilaments which are dynamic
Provide structural support for the cell and resist mechanical stress
Can be compared to the springs inside a mattress, allowing the cell to maintain its shape despite external forces