The three major type, of cytoskeletal filaments are and During an action potenti

Question

The three major type, of cytoskeletal filaments are and During an action potential. Na+ and ions move across the cell membrane when their respective -gated Ion open. Most transient interactions between proteins in ceils are mediated by chemical bonds. Two classes of motor proteins that 'walk- along microtubules are and The highest resolution images of cellular structures tend to come from microscopes. Most growth factors (mitogens) signal via . which in turn activate a sequence of phosphorylations events caused by , Stem cells generated in the laboratory are usually either classified as The cell cycle consists of an alternation between , which appears as a period of dramatic activity under the microscope, and a preparative period called ,which consists of three phases called , and During M phase, the nucleus divides in a process called , and the cytoplasm splits in two in a process called The cell-cyde control system relies on sharp increases in the activities of regulatory proteins called or to

Explanation / Answer

1). The three major cytoskeletal filaments are, microfilaments, microtubules and intermediate filaments.

Microtubules are the hollow filaments, having a diameter of 20-25 nm. They are composed of a protein called “tubulin.” The assembly of microtubules is controlled by the “centrosome,” which lies near the nucleus. Microtubules play an important role in the formation of spindle fibres (of meiosis and mitosis).

Microfilaments are the rod like structures of actin filament (a muscle protein). Microfilaments form mesh like structures and also provide cell motility. Myofibrils (of the muscle) are the aggregates of microfilaments, which are responsible for muscle contraction.

The diameter of intermediate filaments is about 7 to 10 nm, so they are known as intermediate filaments. Eg: keratins and lamins.

2). During action potential, Na+ and K+ (potassium) ions move across the cell membrane when their respective voltage gated ion channels open.

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