Day 27 Agenda: Turn in Project The cell membrane notes

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Presentation transcript:

Day 27 Agenda: Turn in Project The cell membrane notes Khan academy video: cell membrane intro.

Bell Ringer Day 27 Number 1-8 and then label the organelles. Cytoplasm Cell Wall Vacuole Endoplasmic Reticulum (ER) Nucleus Mitochondria Cell Membrane Chloroplast 1 2 3 5 7 6 8 4 Image: http://fds.oup.com/www.oup.co.uk/images/oxed/children/yoes/nature/plantcell.jpg

Endoplasmic Reticulum (ER) The answers are … Vacuole 1 2 3 5 7 6 8 Cytoplasm Chloroplast Mitochondria Nucleus Cell Wall 4 Endoplasmic Reticulum (ER) Cell Membrane

The Key to Cellular Transport The Cell Membrane The Key to Cellular Transport

Red plasma membrane stain

Eukaryotic Cell?

Eukaryotic Cell - Plant

Blue Stain. Cell Type?

Brown Stain. Cell Type?

Cell (or Plasma) Membrane All cells have a plasma membrane that surrounds the cell and protects/separates the cell from the environment

Characteristics of the Cell Membrane Made of a phospholipid bilayer Selectively permeable -it controls “selects” what can enter or leave the cell -allows nutrients in, wastes out to maintain HOMEOSTASIS Fluid Mosaic Model - made of different molecules – phospholipids, proteins, cholesterol - the molecules can move “fluid”

Lipid bi-layer – the heart of the membrane

Sketch the cell membrane

Phospholipids: Phosphate Heads hydrophillic head– loves water and charged particles

Phospholipids: Lipid Tails hydrophobic – fear water and charged particles

Specialized Proteins Cell recognition Signaling Channels to let substances in and out Pumps to move substances in and out Proteins

Receptor Proteins recognize and bind with substances outside of the cell, causing changes inside the cell

Enzymes Allow reactions to occur- light reactions and ETS occur with enzymes in membrane

Transport Proteins Proteins that extend across the membrane – provide a way for large or charged molecules to cross the membrane

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