Lecture 12 - BIOL104-04 Principles of Biology I September...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: BIOL104-04 Principles of Biology I September 22, 2010 Lecture #12 Ch 4.7 - 4.8 Cell-Cell Interactions Ch 43.1 - 43. 5 Tissues Cell-Cell Interactions How does a cell interact with the world outside its membrane? How does a cell interact with neighboring cells? Extracellular layer Defines cells shape Attaches cells to each other 1st line of defense Prokaryotes Biofilm Plants Cell wall Animals Extracellular matrix Connection & communication Unicellular organisms live in habitats Oral bacteria 500 species of bacteria in the mouth Secrete biofilm Hard, polysaccharide substance Cooperation among species Protects cells from immune system or antibiotics Plant cell wall Primary cell wall Microfibrils Cellulose strands Cross-linked by polysaccharide filaments Bundled into cables Synthesized by enzymes in plasma membrane Pectin Hydrophilic polysaccharides Hold water to keep cell wall moist Synthesized in RER + Golgi Plant cell wall Plant cell wall Primary Cell wall Turgor pressure Cytoplasm is hypertonic Osmosis of water Secondary cell wall Varies with cell function...
View Full Document

This note was uploaded on 05/03/2011 for the course BIOL 104 taught by Professor Bray-speth during the Fall '11 term at Saint Louis.

Page1 / 39

Lecture 12 - BIOL104-04 Principles of Biology I September...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online