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4 Cards in this Set
- Front
- Back
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briefly describe the 2 membrane proteins of a cell |
integral protein - exten through the memberane peripheral protein - attached on the surface of memberane |
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what are the functions of membrane proteins |
1.ion channel - allows specific ions to enter 2. Receptor 3. carrier/transport - binds specific substance changes shape and moves across membrane 4. enzyme - catalyse reaction (inside or outside cell) 5.cell identity - allows recognition 6. linker - anchors intracellular and extracellular filaments to the cell membrane allows cell movement |
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what is the concentration gradient |
the difference in the concentration of a substance inside to outside the cell |
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how do substance travel across the membrane |
Kinetic Energy diffusion simple Osmosis Through Protein membranes Facilitated Diffusion - channel mediated and carrier mediate Active transport - primary active requires ATP and secondary active requires energy from sodium and hydrogen (symporters ,anti porters) Through Vesicles Endocytosis - receptor mediated, phagocytes, bulk phase Exocytosis Transcytosis
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