The cell organelles of eukaryotic cells are moved bya)Actin filaments onlyb)Microtubules onlyc)Both actin filaments and microtubulesd)Both cilia and flagellaCorrect answer is option 'C'. Can you explain this answer?

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The cell organelles of eukaryotic cells are moved by

a)
Actin filaments only
b)
Microtubules only
c)
Both actin filaments and microtubules
d)
Both cilia and flagella

Correct answer is option 'C'. Can you explain this answer?

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Verified Answer

The cell organelles of eukaryotic cells are moved bya)Actin filaments ...

Key Points

The membrane-bound organelles are a characteristic feature of eukaryotic cells.
These organelles are moved as a result of cytoplasmic streaming which is driven by cytoskeletal elements.
The cytoskeleton consists of a network of protein filaments present throughout the cytoplasm.
They play important role in forming structural framework of the cell.
They also help in cell movement and internal movement of cellular structures.
They have the ability to get reorganized as the cell changes shape or moves.

Important Points

The cytoskeleton comprises of 3 major protein filaments - actin filaments, intermediate filaments and microtubules.
Actin filaments:
- They constitute the microfilaments and can be present in globular (G-actin) or filamentous (F-actin) forms.
- They function in the presence of ATP to form the polar filamentous structures.
- They provide the track for vesicle and organelle movement inside the cell.
- They take part in cytokinesis during cell division and muscle contraction in animals.
Microtubules:
- These are formed by α-tubulin and β-tubulin proteins.
- These proteins form 13 polymerized dimers called protofilaments.
- These protofilaments are arranged in a ring-like structure to form the hollow structure of microtubules.
- They are the structural elements of cilia, flagella and centrioles.
- They help in chromosome movement to opposite poles during cell division.
- They provide the track along which vesicles and cellular organelles move through the cell.
Intermediate filaments:
- They are made of several strands of fibrous proteins that remain bound together.
- They are of intermediate size between actin filaments and microtubules.
- They have no role in cell movement.
- They maintain the shape of the cell and hold the organelles in place.
- It is made of proteins like Keratin that strengthens hair and nails.
Actin and microtubules form a network of proteins that create a rail-like track for organelle movement.
The organelles are bound to the cytoskeletal proteins which move along the tracks.
This movement is ATP-dependent and takes place gradually in a step-wise manner.

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The cell organelles of eukaryotic cells are moved bya)Actin filaments onlyb)Microtubules onlyc)Both actin filaments and microtubulesd)Both cilia and flagellaCorrect answer is option 'C'. Can you explain this answer?

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