- 1 What motor proteins is associated with intermediate filaments?
- 2 Which of the following molecular motors are known to travel in a retrograde direction along microtubules?
- 3 Which of the following are intermediate filaments?
- 4 Which of the following molecular motors are associated with actin filaments?
- 5 What is the main function of intermediate filaments?
- 6 What best describes the main function of intermediate filaments?
- 7 What type of proteins are motor domains?
- 8 Where is dynein found?
- 9 What is the difference between kinesin and dynein?
- 10 What are 2 Functions of intermediate filaments?
- 11 What are the 5 intermediate filaments?
- 12 Which is the main function of intermediate filaments quizlet?
- 13 What are the importance of molecular motors?
- 14 What kind of filament is myosin?
- 15 What are the functions of molecular motors?
What motor proteins is associated with intermediate filaments?
Although no known motors move on the apolar intermediate filaments, motor proteins move intermediate filaments along microtubules. A spectacular example is found in nerve cells (see Fig. 37.5C).
Which of the following molecular motors are known to travel in a retrograde direction along microtubules?
Dyneins are microtubule motors capable of a retrograde sliding movement. Dynein complexes are much larger and more complex than kinesin and myosin motors. Dyneins are composed of two or three heavy chains and a large and variable number of associated light chains.
Which of the following are intermediate filaments?
Two types of intermediate filaments, desmin and the neurofilaments, play specialized roles in muscle and nerve cells, respectively. Desmin connects the individual actin-myosin assemblies of muscle cells both to one another and to the plasma membrane, thereby linking the actions of individual contractile elements.
Which of the following molecular motors are associated with actin filaments?
Microfilaments are composed of the most abundant cellular protein known as actin. During contraction of a muscle, within each muscle cell, myosin molecular motors collectively exert forces on parallel actin filaments.
What is the main function of intermediate filaments?
Their functions are primarily mechanical and, as a class, intermediate filaments are less dynamic than actin filaments or microtubules. Intermediate filaments commonly work in tandem with microtubules, providing strength and support for the fragile tubulin structures.
What best describes the main function of intermediate filaments?
Intermediate filaments consist of several intertwined strands of fibrous proteins. Intermediate filaments have no role in cell movement. Their function is purely structural. They bear tension, thus maintaining the shape of the cell, and anchor the nucleus and other organelles in place.
What type of proteins are motor domains?
Motor proteins, such as myosins and kinesins, move along cytoskeletal filaments via a force-dependent mechanism that is driven by the hydrolysis of ATP molecules (reviewed in ).
Where is dynein found?
Dynein is a minus-end-directed microtubule motor protein, which transports a variety of intracellular cargo by hydrolysing ATP to power its movement along microtubule tracks. Axonemal dyneins are found cilia and flagella, whereas cytoplasmic dynein is found in all animal cells.
What is the difference between kinesin and dynein?
Kinesin walks along microtubules toward the plus ends, facilitating material transport from the cell interior toward the cortex. Dynein transports material toward the microtubule minus ends, moving from the cell periphery to the cell interior.
What are 2 Functions of intermediate filaments?
Intermediate filaments are therefore found in particularly durable structures such as hair, scales and fingernails. The primary function of intermediate filaments is to create cell cohesion and prevent the acute fracture of epithelial cell sheets under tension.
What are the 5 intermediate filaments?
Intermediate filaments are distributed in a number of cell types, including: Vimentin in fibroblasts, endothelial cells and leukocytes; desmin in muscle; glial fibrillary acidic factor in astrocytes and other types of glia, and peripherin in peripheral nerve fibers.
Which is the main function of intermediate filaments quizlet?
What is the main function of intermediate filaments? Intermediate filaments have great tensile strength, and their main function is to enable cells to withstand the mechanical stress that occurs when cells are stretched.
What are the importance of molecular motors?
Molecular motors are involved in a wide variety of cellular activities, including contraction, organelle transport, cell movement, cell division, signaling, RNA localization, sensory transduction and basic developmental processes (Table 3).
What kind of filament is myosin?
Actin filaments, usually in association with myosin, are responsible for many types of cell movements. Myosin is the prototype of a molecular motor—a protein that converts chemical energy in the form of ATP to mechanical energy, thus generating force and movement.
What are the functions of molecular motors?
Molecular motors are protein machines whose directed movement along cytoskeletal filaments is driven by ATP hydrolysis. Eukaryotic cells contain motors that help to transport organelles to their correct cellular locations and to establish and alter cellular morphology during cell locomotion and division.