BIO 1140 Midterm: Revision 3 (Cytoskeleton)

• School: University of Ottawa
• Department: Biology
• Course: BIO 1140
• Professor: Caroline Petit- Turcotte

Document Summary

Microtubules and microilaments pushing against the membrane in 3d, Given their roles, speed at changing shape & length; orientaion will be important. No covalent bond: able the acion of fast stretching and recoiling. Acion of enguling and phagocytosis of cells performed by the extend and recoil of microilaments & microtubules. **breaking covalent bond requires energy, if it has covalent bond, it will consume many energy every ime it stretches and recoil. Tubulin dimers (alpha & beta tubulins): basic unit of microtubules. Gtp binding site locaion confers polarity to mt: Alpha end" ; beta + end". Originate from a central point, the mtoc (microtubule organizaion center) at the. *gtp: one type of energy, similar to atp, but with guanine giving polarity and orientaion. Tubulin dimers are added onto the beta +" end. Tubulin heterodimers assemble as a single row (protoilament) 13 of protoilament form a 3d structure into a hollow tube. Explains the tubule shape (1 every 28 degree)