EPITHELIUM
CILIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They serve as mechanical stiffeners for microvilli.
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They are composed of actin subunits.
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They are involved in cell locomotion.
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They form mitotic spindles.
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Detailed explanation-1: -(d) Mitotic spindle is a macromolecule produced during mitosis cell division that helps in the segregation of chromosomes. The spindle is composed of microtubules, not microfilament. As the provided statement is false, option (d) is correct.
Detailed explanation-2: -Microfilaments are double-stranded molecules of polymerized fibrous (F) actin; the monomeric form of the protein is globular (G) actin; and these two forms exist in equilibrium in the cell. The microfilaments are present in bundles and form a three-dimensional (3D) intracellular meshwork.
Detailed explanation-3: -Which of the following is true regarding microfilaments? Explanation: Microfilaments are the smallest of the three cytoskeletal elements and are made up of actin filaments (myosin is not found in microfilaments). The 9+2 arrangement is found in microtubules, the biggest cytoskeletal elements.
Detailed explanation-4: -Microtubules, with intermediate filaments and microfilaments, are the components of the cell skeleton which determinates the shape of a cell. Microtubules are involved in different functions including the assembly of mitotic spindle, in dividing cells, or axon extension, in neurons.
Detailed explanation-5: -Another important function of microfilaments is to help divide the cell during mitosis (cell division). Microfilaments aid the process of cytokinesis, which is when the cell “pinches off” and physically separates into two daughter cells.