Question 1
Question 2
Given these terms (microfilaments, microtubules, intermediate filaments) which one best suits the sentences given:
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 proteins dimer 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 intercellular movement of the whole cell locomotion are the _____.
6. During muscle contractions myosin motor proteins move across tracks of _____.
Question 3
Question: Cytoskeleton components (microfilaments, microtubules, and intermediate filaments) are often compared to railroad tracks, which are built by laying down one railroad at a time. How does this analogy fall short of illustrating the dynamic instability of cytoskeleton components? Cytoskeletal Elements: There are three types of cytoskeletal elements present in a eukaryotic cell. These are intermediate filaments, microfilaments, and microtubules. The cytoskeletal elements are important for maintaining homeostasis and cell survival.
Answer to question 1
1. microtubules
3. microtubules
4. microfilaments
5. intermediate filaments
6. microfilaments
Answer to question 2
Answers are listed below. microfilaments, microtubules, intermediate filaments
1. In eukaryotic flagella, the fibers that slide past one another due to the activity of dynein proteins are microtubules.
2. Many cell organelles, most notably the nucleus, are anchored by intermediate filaments which are assembled from a diverse class of proteins.
3. Centrosomes are sites where proteins dimer into microtubules.
4. The extension of pseudopodia in amoeba is due to the regulated assembly and destruction of microfilaments.
5. The only cytoskeletal fibers not associated with intercellular movement of the whole cell locomotion are the intermediate filaments.
6. During muscle contractions myosin motor proteins move across tracks of microfilaments.
Answer to question 3
The cytoskeletal elements that form an important part of the cell structure serve to maintain cell shape, integrity, and rigidity. The cytoskeletal elements also enable the flow of biomolecules from one place to another. The analogy of comparing them with railway tracks falls short as the cytoskeletal elements enable the movement of molecules in varied directions from their site of formation to the target site. Railway tracks only allow movement in one direction whereas cytoskeletal elements allow movement in multiple directions and also allow cell contraction, division of cytoplasm through cytokinesis and maintain cell polarity. These functions are not depicted through the railway track analogy.