The Cell- Jan 19 - Biology Notes: The Cell Cell Theory...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Biology Notes: The Cell Cell Theory [figure 3.2 pg 63] -the cell is the basic structural and functional unit of life -organismal activity depends on individual and collective activity of cells -biochemical activities of cells are dictated bu subcellular structures (called organelles) -continuity of life has a cellular basis Cell Diversity [figure 3.1 page 62] -over 200 diff types of cells -types differ in size shape functions, and subcellular components Typical Cell Characteristics Plasma membrane : encloses the cell -responsible for cells ability to interact with its environment Cytoplasm: fill cell interior -contents: sugars amino acids and protein -eukaryotes have specialized membrane bound organelles Genetic material -DNA located in nucleus in eukaryotes PLASMA MEMBRANE figure 3.3 pg 65] -separates intracellular fluids from extracellualar fluids -plays a dynamic rols in cellular activity. -glycocalyx is a glycoprotein area abutting the cell that provides highly specific biological markers by which cells recognize one another. Fluid Mosaic Model -Plasma membrane is composed of both lipids and globular proteins. -Polar hydrophilic heads -non polar hydrophobic tails -double bilayer of lipids with imbedded, dispersed protesins -bilayer consists of phospholoipids, choloesterol and glycolipids -glycolipids are lipids {to separate the water within the cell from the water without the cell} with bound carbohydrates -phospholipids have hydrophobic and hydrophilic bipoles Functions of Membrane Proteins [figure 3.4. pg. 66] -Transport: transport Protein -Enzymatic activity: enzymes -Receptors for signal trasduction -Enxyme activity -cell- cell recognition -attachment Lipid Rafts -composed of shingolpids and cholesterol
Background image of page 1

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

View Full DocumentRight Arrow Icon
Membrane Junctions: *Tight Junctions [figure 3.5 pg 67] -prevent fluids and most molecules from moving between cells -where might be useful? In the stomach; wouldnt want any acids getting through. *Desmosomes[figure 3.5 pg 67]
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

The Cell- Jan 19 - Biology Notes: The Cell Cell Theory...

This preview shows document pages 1 - 3. Sign up to view the full document.

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