Phospholipid Flashcards

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1
Q

Define hydrophilic

A

Water loving

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2
Q

Define hydrophobic

A

Water fearing

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3
Q

Define amphipathic

A

describing a molecules which has both hydrophobic and hydrophilic properties

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4
Q

Outline the amphipathic properties of phospholipids

A

Phospholipids contain hydrophilic heads and hydrophobic tails

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5
Q

Explain why phospholipids form bilayers in water, with reference to hyrdrophillic phosphate heads and two hydrophobic hydrocarbon tails

A

There is water both outside the cell and inside the cell.

So, phospholipids will arrange themselves in a bilayer so that the hydrophilic head associates with the water and the hydrophobic tails face each other (away from the water)

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6
Q

Head of a phospholipid is made up of

A

Phosphate bounded to glycerol

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7
Q

Tails of a phospholipids are

A

chains of hydrogen and carbon atoms (AKA a hydrocarbon chain)

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8
Q

How is the head of a phospholipid hydrophilic?

A

head is exposed to water

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9
Q

How are the tails of phospholipids hydrophobic?

A

tails are oriented inside the bilayer

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10
Q

“P” means

A

phosphate group

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11
Q

“O” means

A

glycerol

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12
Q

how to know if fatty acids are present in a diagram?

A

it is everything else except P or O

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13
Q

Unsaturated hydrocarbon tail

A

not tightly packed and there is atleast one double bond between the carbons

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14
Q

hydrogens in an Unsaturated hydrocarbon tail

A

have fewer hydrogens present that can bond to the carbons (so there is a double bond between the carbons)

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15
Q

What do Unsaturated hydrocarbon tails cause?

A

kinked chains (which increases fluidity in the membrane, and hinders close packaging of phospholipids)

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16
Q

saturated hydrocarbon tail

A

all tightly packed and there are no double bonds between the carbons

17
Q

hydrogens in a saturated hydrocarbon tail

A

-have as many hydrogens present as can bond to the carbons (So they lack double bonds)

18
Q

Structure of saturated hydrocarbon tail

A

chain is always straight!

19
Q

Watery environment on top of a phospholipid

A

Extracellular fluid

20
Q

Watery environment on the bottom of a phospholipid

A

Cytosol