Cytoskeleton and motor proteins flashcards
Study essential concepts of the cytoskeleton and motor proteins in cell biology, including their structures, functions, and interactions.
Quiz(32 questions)
1. Which cytoskeletal component is primarily involved in muscle contraction?
Terms in this Study Set(32)
Cytoskeleton Components(16)
What is the primary function of microfilaments?
Microfilaments provide structural support, aid in cell movement, and are involved in muscle contractions.
True or False: Intermediate filaments are involved in cell division.
False. Intermediate filaments provide tensile strength and maintain cell shape, but do not directly participate in cell division.
Name the protein that makes up microfilaments.
Actin - it forms thin filaments that help with cell shape and motility.
What role do microtubules play in the cell?
Microtubules provide structural support, facilitate intracellular transport, and are essential for cell division.
Fill in the blank: __________ are the largest components of the cytoskeleton.
Microtubules.
Compare microfilaments and microtubules: size and function.
Microfilaments: smaller, involved in movement and shape. Microtubules: larger, involved in transport and cell division.
What are the three major components of the cytoskeleton?
Microfilaments, Intermediate filaments, Microtubules.
True or False: Intermediate filaments are dynamic and change length frequently.
False. Intermediate filaments are stable and provide structural integrity.
What role do cytoskeletal components play in intracellular transport?
They serve as tracks for motor proteins to transport organelles and vesicles.
What are the properties of microtubules?
Dynamic instability, hollow structure, and composed of tubulin dimers.
What are intermediate filaments primarily made of?
Different proteins like keratin, vimentin, and lamins - providing strength.
How do microfilaments assist in cell motility?
They polymerize and depolymerize, allowing cells to change shape and move.
What is the role of actin in muscle contraction?
Actin filaments slide past myosin filaments, resulting in muscle contraction.
Name a key role of microtubules during mitosis.
They form the mitotic spindle to segregate chromosomes.
What is the significance of cytoskeletal organization?
It maintains cell shape, enables movement, and organizes cellular components.
Fill in the blank: Microtubules are crucial for __________ during cell division.
Chromosome separation.
Motor Proteins(16)
What are motor proteins?
Motor proteins are molecular machines that convert chemical energy into mechanical work, facilitating movement within cells.
Types of motor proteins?
1. Myosin 2. Kinesin 3. Dynein
How do myosins move?
Myosins move along actin filaments by hydrolyzing ATP, enabling muscle contraction and cargo transport.
True or False: Kinesin moves toward the cell center.
False. Kinesin typically moves toward the cell periphery (plus end of microtubules).
Compare kinesin and dynein.
Kinesin moves toward the plus end of microtubules, while dynein moves toward the minus end.
Fill in the blank: Dyneins are responsible for ____ transport.
retrograde
What is the role of ATP in motor protein activity?
ATP provides the energy needed for motor proteins to change shape and generate movement.
How do motor proteins contribute to vesicle transport?
Motor proteins (kinesin and dynein) transport vesicles along microtubules, ensuring proper intracellular transport.
What powers muscle contraction?
Muscle contraction is powered by myosin motor proteins interacting with actin filaments through ATP hydrolysis.
What do motor proteins transport?
Motor proteins transport organelles, vesicles, and protein complexes within the cell.
True or False: Myosin moves along microtubules.
False. Myosin moves along actin filaments.
Describe kinesin's movement mechanism.
Kinesin steps along microtubules by alternating the attachment of its two heads, powered by ATP hydrolysis.
What is retrograde transport?
Retrograde transport refers to the movement of materials toward the cell body, primarily driven by dynein.
How do motor proteins impact cell division?
During cell division, motor proteins help segregate chromosomes by moving them along the spindle apparatus.
What is the significance of motor proteins in cilia?
Motor proteins, particularly dynein, facilitate the bending and movement of cilia, crucial for cell motility.
Cause → Effect: ATP hydrolysis in motor proteins.
Cause: ATP hydrolysis → Effect: Conformational change and movement along filaments.
Questions in this Study Set(32)
1. Which cytoskeletal component is primarily involved in muscle contraction?
2. Which of the following best defines motor proteins?
3. What are the building blocks of microtubules?
4. Which motor protein is primarily involved in muscle contraction?
5. Which cytoskeletal component helps maintain cell shape and provides tensile strength?
6. Kinesin primarily transports cargo toward which direction?
7. Which cytoskeletal structure is the largest?
8. Which of the following is NOT a type of motor protein?
9. Which of the following is NOT a function of microtubules?
10. How do dyneins primarily transport cellular materials?
11. What characteristic differentiates intermediate filaments from microfilaments?
12. What role does ATP play in the functioning of motor proteins?
13. In the context of intracellular transport, what role do motor proteins play?
14. Which motor protein typically moves towards the minus end of microtubules?
15. Which cytoskeletal component is dynamic and can rapidly assemble and disassemble?
16. Fill in the blank: Kinesin is primarily responsible for ____ transport.
17. What is actin's major role in cell motility?
18. What is the effect of ATP hydrolysis on motor proteins?
19. Which cytoskeletal component plays a key role during mitosis?
20. Which motor protein is NOT directly involved in intracellular transport?
21. Which of the following proteins is a major component of intermediate filaments?
22. How do motor proteins contribute to the segregation of chromosomes during cell division?
23. Fill in the blank: Microtubules are crucial for __________ during cell division.
24. True or False: Myosin primarily moves along microtubules.
25. How do microfilaments facilitate cell movement?
26. True or False: Dynein is responsible for cilia movement.
27. Which function is NOT associated with the cytoskeleton?
28. What is the primary function of kinesin in a neuron?
29. What is the primary role of microfilaments in relation to cellular processes?
30. Which motor protein is primarily responsible for retrograde transport in neurons?
31. Which cytoskeletal component is primarily responsible for providing structural support and maintaining cell shape?
32. Which of the following statements about motor proteins is FALSE?
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