Lecture 11 Questions

Lecture 11 Questions - 1. How are microfilaments (actin...

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1. How are microfilaments (actin filaments) constructed? What is the approximate diameter of a microfilament and how does this compare with the diameter of a microtubule? Microfilaments (actin filaments) are two intertwined strands of actin and each strand is a chain of actin subunits. The diameter of a microfilament is approximately 7 nm while the diameter of a microtubule is approximately 25 nm. 2. What is cytoplasmic streaming? How is actin involved in cytoplasmic streaming? Cytoplasmic streaming is the circular flow cytoplasm in large plant cells. The cytoplasmic contents move along a "carpet" of parallel microfilaments and the movement is dependent on molecular motors interacting with the   microfilaments. 3. What is the molecular motor that is involved in muscle contraction? In muscles, myosin "arms" are molecular motors and they produce the sliding of myosin filaments along microfilaments. This shortens the muscle cells. 4.
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This note was uploaded on 03/09/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Lecture 11 Questions - 1. How are microfilaments (actin...

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