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IB Biology Topic 1: Cells > 1.4 Membrane transport > Flashcards

1.4 Membrane transport Flashcards

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1
Q

Key properties of cell membranes

A

Semi-permeable

Selective

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2
Q

Osmolarity

A

Solute concentration

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3
Q

Hypertonic

A

High solute concentration

Gain water (THE SOLUTION)

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4
Q

Hypotonic

A

Low solute concentration

Loses water (solution LOSES water into the cell)

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5
Q

Isotonic

A

Same solute concentration

NO NET FLOW

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6
Q

Active Transport

A

Uses ATP

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7
Q

The fluidity of plasma membrane allows it to…

A

break and reform aroujd certain materials

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8
Q

Exocytosis

A

Materials released FROM a cell via vesicles

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9
Q

Endocytosis

A

Materials internalized within a vesicle

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10
Q

Intercellular vesicles….

A

move materials between cell organelles

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11
Q

Osmosis

A

The net movement of water molecules across a semi-permeable membrane

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12
Q

Simple diffusion

A

Small. Non polar

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13
Q

Examples of small or nonpolar molecules

A

H20

Glycerol

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14
Q

Examples of large polar molecules

A

Glucose

Sucrose

Potassium

Sodium

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15
Q

Facilitated diffusion helps

A

Large, Polar, (ions and macromolecules)

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16
Q

Vesicle transport

A

ER to Golgi to Membrane

17
Q

Step 1 of vesicle transport

A

A polypeptide is destined to be secreted

Signal recognition polypeptides signal ribosome to rough ER

18
Q

Step 2 of vesicle transport

A

Ribosome synthesizes polypetide in the lumen of rough ER

19
Q

Step 3 of vesicle transport

A

Polypetide is transferred to golgi via vesicles budding from rough ER

20
Q

Step 4 of vesicle transport

A

Polypeptide travles from cis to trans face of golgi via vesicles

May be modified

21
Q

Step 5 of membrane transport. FINAL

A

Polypetide is finally transferee to plasma membrane via vesicle where it’s secreted

22
Q

Endocytosis is also

A

PHAGOCYTOSIS

23
Q

Endocytocis does what

A

Engulfs material into an envelope. does not directly pass membrane

24
Q

Exocytosis does what

A

Releases large substances via vesicles

Does not travel across the plasma membrane

25
Q

Structural properties of membrane

A

Phosphobilips are held together by weak hydrophobic interactions

Hydrophobic/Hydrophillic layers restrict entry

Phospholipids can move horizontally

Fluidity allowe for the breakinh of membrane

26
Q

Active transport SYMPORT

A

both molecules move the same direction

27
Q

Active transport ANTIPORT

A

Molecules move in opposite directions

IB Biology Topic 1: Cells (9 decks)

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