unit 4 - cell processes Flashcards

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1
Q

cell membranes are _________ or ______________

A
  • semipermeable
  • selectively permeable
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2
Q

semipermeability

A

ability of certain molecules to enter/exit cell

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3
Q

cell membrane structure

A

phospholipid

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4
Q

membrane proteins

A
  • surface proteins
    - combined w carbs
  • integral proteins
    - transport things across, in, out of cell membrane
    - protein channel, carrier protein, protein pump
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5
Q

equilibrium

A

state of balance
- liquids
- gases
- dissolved substances

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6
Q

concentration

A

measure of amt of a solute in a solution

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7
Q

concentration gradient

A

gradual change in concentration of solutes as function of distance thru a solution

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8
Q

tonicity

A

amt of solute in a solution compared to another solution/cell

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9
Q

passive transport

A

when things pass thru cell membrane naturally

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10
Q

simple diffusion

A

solutes move right thru phospholipids

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11
Q

facilitated diffusion

A

solutes need protein channel to move thru

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12
Q

osmosis

A

movement of water (solvent) ONLY
(solute doesn’t move)

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13
Q
  • requires 0 energy
  • substances move w/ concentration gradient
  • high –> low
A

passive transport

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