CAS BI 108 Lecture Notes - Lecture 12: Nuclear Pore, Nuclear Membrane, Endoplasmic Reticulum

• School: Boston University
• Department: Biology
• Course: CAS BI 108
• Professor: Edward Loechler

Document Summary

Solute concentration inside cell less than outside. Solutes concentration inside cell greater than outside. How does water (hydrophilic) go through membrane (hydrophobic): simple diffusion. Many cells have water transporters (facilitated diffusion: aquaportinsrbc aquaportin 0. Cell surface increasing as 4r2 while cell volume = (4/3)(pi)r3. If r is too big, not get enough substances into a cell ef ciently through membrane. Within nucleus is nucleolus (ribosomes synthesized and assembled - has its own. Nuclear pore complex (npc) - holes that are important for transport. Traf cking: send proteins to right location (inside or outside of cell) Extracellular matrix ( bers of collagen + proteoglycans) -> structure and motion. Micro laments (smaller laments - 7nm) -> actin/myosin. Microtubules (larger laments - 25nm) -> tubulin, kinesin, dynein. Cell wall (cellulose) -> maintain cell shape and integrity. Chloroplasts -> harvest energy of sunlight to produce sugar, atp, energy