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The cytoskeleton of a eukaryotic cell plays a major role in organizing the structures and activities of the cell. The cytoskeleton consists of three main types of fibers: microfilaments, intermediate filaments, and microtubules. The three types of fiber differ in size, composition, and the functions they perform in the cell. A structure of the cytoskeleton including microfilaments, intermediate filaments, and microtubules. Intermediate filaments are the thinnest ones, and microtubules are the widest ones. Drag the terms on the left to the appropriate blanks in the sentences on the right. Terms can be used once, more than once, or not at all.
1. In eukaryotic flagella, the fibers that slide past one another due to the activity of dynein proteins are _______.
2. Many cell organelles, most notably the nucleus, are anchored by which are assembled from a diverse class of proteins.
3. Centrosomes are sites where protein dimers assemble into ________.
4. The extension of pseudopodia in amoeba is due to the regulated assembly and destruction of ______.
5. The only cytoskeletal fibers not associated with intracellular movement or whole cell locomotion are the _______.
6. During muscle contractions, myosin motor proteins move across tracks of ______.

Respuesta :

Answer:

1. Microtubules

2. Intermediate filaments

3. Microtubules

4. Microfilaments

5. Intermediate filaments

6. Microfilaments

Explanation:

According to this question, the three main types of fibres found in the cytoskeleton of eukaryotic cells are microfilaments, intermediate filaments, and microtubules. They serve different functions in the cell.

1. MICROTUBULES are proteinous fibres found in cells. They are responsible for the functionality of the eukaryotic flagella as they slide past one another due to the activity of dynein proteins.

2. INTERMEDIATE FILAMENTS are one of the three types of cytoskeletal fibres found in eukaryotes. They are made of different proteins and provide structural support/anchorage to many cell organelles, most notably the nucleus.

3. Centrosomes are organelles found in cells responsible for organizing proteinous fibres called MICROTUBULES. Hence, they are are sites where protein dimers assemble into microtubules.

4. Microfilaments are narrow cytoskeletal fibres made of protein called ACTIN. MICROFILAMENTS are actively involved in locomotion or movement, hence, their regulated assembly and destruction is responsible for the extension of pseudopodia in amoeba.

5. As mentioned earlier, INTERMEDIATE FILAMENTS are one of the three cytoskeletal fibres but the only one not involved in intracellular movement or locomotion. They are rather supportive fibers.

6. Muscle contractions is as a result of the activities of ACTIN AND MYOSIN proteins, which are components of a type of cytoskeletal fibre called microfilaments. Therefore, myosin motor proteins move across tracks of MICROFILAMENTS during muscle contraction.