Answer:
option A is the correct answer
Explanation:
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Answer:
Microtubules composed of tubulin protein.
Explanation:
The cytoskeleton is composed of three well defined filamentous structures: microtubules, microfilaments, and intermediate filaments. Each of these filamentous structures is a polymer of proteinic subunits united by weak, not covalent connections.
Microtubules are long hollo cylindric tubes with no ramifications of a diametre near to 25 nanometers. They are constituted by two subunits of tubulin protein which polymerize to form microtubules. These filaments shape the cell and are involved in intracellular transport. Microtubules extend from an organizing center near the nucleus to the cellular surface.
Rtks can activate the enzyme phosphoinositide 3-kinase, which phosphorylates inositol phopholipids; these phospholipids then serves as docking sites that recruit specific intracellular signaling proteins to the plamsa membrane. RTKs may activate various pathways including; the MAP-kinae signalling module, the Ras signalling pathway, and the phospholipase C/inostol phospholipid signaling pathway.
Answer:
Photosynthesis is a plant that uses sunlight, water, and carbon dioxide to make sugar and oxygen.