cell membranes general Flashcards

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1
Q
  1. What is the difference between the outer and inner surface of the plasma membrane?
A
  1. The outer surface of the membrane has chains of sugar, carbs that are part of the glycolipids and glycoproteins
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2
Q
  1. Explain under what circumstances CO2 might diffuse into a palisade cell, how the process takes place?
A
  1. -Photosynthesis in the palisade cell uses CO2 maintaining a low concentration inside the cell
    • The concentration of CO2 outside and in air spaces is higher than inside the cell
    • CO2 diffuses into cell down CG,

Cell wall and plasm and membrane are both permeable to CO2

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3
Q
  1. Suggest what might be moved out of a cells in the pancreas by exocytosis?
A

Digestive enzymes, insulin and glucagon

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4
Q
  1. Approximate width of membrane
A

7nm

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5
Q
  1. Function of the intrinsic channel protein
A

Create a water filled channel in which polar ions can pass through

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6
Q
  1. 5 roles of a glycoprotein
A
  1. Cell adhesion to hold cells together
    • attach to water molecules to stabalise membrane
    • act as antigens
    • cell recognition, precise structure means they can distinguish self from non-self
    • transport substances up CG, using ATP (active transport)
    • create a water filled channel in which polar substances pass through
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7
Q
  1. How do small substances enter the PM
A
  1. Simple diffusion, pass through temporary gaps formed by vibrating phospholipids, move down using their own motion of energy
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8
Q
  1. How do Charged, large substances enter the PM
A
  1. Facilitated diffusion, channel/ carrier protein
    • if it’s a gated ion they bind with the protein to open it
    • or pass through water filled channel protein down CG
    • NO ATP
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9
Q

How do substances enter via active transport

A

Transporter proteins required
Requires ATP energy
Atp changes the shape of the transporter proteins, 3 Na ions out, 2 K in

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