Lab chapter 2: Osmosis/Diffusion Flashcards

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1
Q

eukaryotic cells are covered by a ____

A

cell/plasma membrane

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2
Q

Name the four functions of the cell membrane

A
  1. Barrier
  2. Transport
  3. Organization
  4. Communication
  5. Recognition
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3
Q

Describe how the cell membrane “barrier” function works

A

Lipad bilayer blocks the entry into cell of most substances except water, glycerol, and small lipid-soluble molecules

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4
Q

Describe the cell membrane “transport” function

A

Cell takes up metabolites and eliminates waste products
Molecules move from high to low concentrations

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5
Q

What is facilitated diffusion?

A

substances move through protein channel down their concentration gradients. Passive

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6
Q

What is active transport?

A

membrane proteins move against concentration gradient and requires energy

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7
Q

Describe the “organization” function of cell membranes

A

membranes organize enzymes and electron chains so cell processes are efficient

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8
Q

Describe the “communication” process of cell membrane

A

Hormones bind to receptors on cell surface to trigger reactions

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9
Q

Describe the ‘recognition” function of cell membranes

A

Molecules on surface allow organism between its own cells and foreign cells, basis of immune system

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10
Q

Define diffusion

A

random movement of molecules that occurs in a fluid or a gas, or even in a solid. Movement from high to low concentration.

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11
Q

What is osmosis?

A

Movement of water through semipermeable membrane in response to different concentration of water on two sides of a membrane.

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12
Q

Water will flow from a ___ solute concentration to a _____ solute concentration

A

low to high

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