8.1 Fluid Mosaic Model Flashcards

1
Q

What does plasma membrane do?

A

Plays roles in signaling, entry of nutrients and expulsion of waste, cell recognition, transport of materials between tissues, and even electronic functions.

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2
Q

Stabilizing molecules of cell membranes?

A
  • cholesterol and protein
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3
Q

Stretchy, flexible component of cell membrane?

A
  • Phospholipids
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4
Q

Cell (plasma) membrane

A
  • a semipermeable phospholipid bilayer
  • selectivity is mediated by various channels and carriers that poke holes in the membrane and membrane itself
  • Composed primarily of two layers of phospholipids, the cell membrane permits fat-soluble compounds to cross easily, while larger and water-soluble compounds must seek alternative entry
  • also contain proteins embedded within the lipid bilayer that act as cellular receptors during signal transduction. These proteins play an important role in regulating and maintaining overall cellular activity.
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5
Q

What does phospholipid bilayer include?

A
  • proteins and distinct signaling areas within lipid rafts
  • Carbohydrates associated with membrane-bound proteins create a glycoprotein coat.
  • Plants, bacteria and fungi walls have more carbs.
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6
Q

How do phospholipids move rapidly in the plane of the membrane?

A
  • Simple diffusion
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7
Q

Lipid Rafts

A
  • Collections of similar lipids with or without associated proteins that serve as attachment points for other biomolecules; these rafts often serve roles in signaling.
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8
Q

Can lipids move between membrane layers?

A
  • Yes, but this is
    energetically unfavorable because the polar head group of the phospholipid must be forced through the nonpolar tail region in the interior of the membrane.
  • flippases assist in the transition or “flip” between layers
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9
Q
A
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