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NEUR 301 > 1.1 > Flashcards

1.1 Flashcards

1
Q

Phospholipids are _____________

A

Amphipathic

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2
Q

Phospholipids heads are ____________

A

Hydrophilic

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3
Q

Phospholipids tails are ___________

A

Hydrophobic

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4
Q

At low concentrations phospholipids in water form ___________

A

Monolayer

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5
Q

At higher concentrations they form ____________ and then eventually _____________

A

Micelles ; Bilayer

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6
Q

__________ influences fluidity of a membrane

A

Cholesterol

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7
Q

Phospholipids can move ______________ but THEY CANNOT ____________

A

Laterally, Rotate……. CANNOT FLIP TO THE OTHER LEAFLET

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8
Q

FRICKS LAW

A

Flux of solute = Permeabiliy coefficient (External Concentration - Internal Concentration)

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9
Q

Fricks law is only for ____________

A

Uncharged Particles

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10
Q

Passive transport happens through _____________

A

Facilitated diffusion

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11
Q

Driving force of transport is depended by

A
  1. Concentration
  2. Electrical
  3. Chemical gradient / potential
  4. Energy difference
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12
Q

Dominant Intracellular ion

A

K +

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13
Q

Dominant extracellular ion

A

Na + and Ca 2+

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14
Q

Membrane is at equilibrium when net force is ________

A

Zero

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15
Q

Types of passive facilitated diffusion

A
  1. Pores
  2. Channels
  3. Carriers
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16
Q

Pores are ___________

A

Always open

17
Q

Channels are __________

A

Gated
Require secondary sensors and messengers for them to open

18
Q

Carriers require __________

A

Very selective

Require saturation to a point for them to work

19
Q

In other membranes of gram negative bacteria and mitochondria are ______________

A

Porins

20
Q

Cytotoxic T lymphocytes kill their target cell __________

A

Perforin

21
Q

Regulates traffic into / out of the nucleus

A

Nuclear Pore Complex (NPC)

22
Q

Pores that are just large enough to allow water molecules too pass through

A

Aquaporins

23
Q

Na + K + pump exists to make the cell ________

A

Electrogenic (Excess negative in the cell)

NEUR 301 (4 decks)

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