Lipids: Structure and function of Phospholipids Flashcards

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1
Q

What is a hydrophilic molecule

A

A molecule
attracted to water
due to having a charge

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2
Q

Thinking about it, is a hydrophilic WATER LOVING or WATER HATING?

A

Water loving

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3
Q

Phospholipid is a lipid (TRUE OR FALSE?)

A

TRUE

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4
Q

What is the diff between phospholipid and triglycerides?

A

One of the fatty acid molecules is replaced by a phosphate molecule in a phospholipid

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5
Q

How does the joining of the phosphate group occur?

A

through a condensation reaction between hydroxyl groups on both a glycerol molecule and a phosphoric acid molecule

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6
Q

what covalent bond links the phosphate molecule to the glycerol ?

A

a phosphate ester bond

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7
Q

What are both the phosphate group and the glycerol together known as ? What are the fatty acid chains known as in a phospholipid molecule?

A

The head of the phospholipid
The tail of the phospholipid

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8
Q

What happens when the phospholipid is surrounded by water? What is formed?

A

the hydrogen ions DISSIPATE from the phosphoric acid, forming a phosphate group with a negative charge.

Why? OH groups when losing positive hydrogen ions, leave behind negative oxygen ions and the head gains an overall negative charge

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9
Q

does having a negative charge cause the molecule to become hydrophilic

A

yes

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10
Q

Are fatty acid tails polar? are they charged?

A

NO,They are non polar
No, they are not charged

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11
Q

What is a hydrophobic molecule?

A

a molecule repelled from water due to not having a charge

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12
Q

Can phospholipids form layers on the surface of the water? how?

A

yes
the hydrophilic heads are attracted to the water and submerged and the hydrophobic heads are repelled by water

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13
Q

What is the name of a
spherical monolayer of phospholipids formed?

A

micelle

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14
Q

Phospholipids can also form a trilayer in cell membrane true or false?

A

false
bilayer in the cell membrane

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15
Q

where can we find a phospholipid bilayer?

A

in the cell membrane

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16
Q

where is the facing of hydrophilic tails and what is the facing of hydrophobic tails?

A

hydrophillic outwards
hydrophobic inwards

17
Q

what keeps the membrane fluid?
but what keeps it stable?

A

the fact that phospholipids can move and slide past each other, however they will never expose the hydrophobic tails to water which keeps the membrane stable

18
Q

Role of phospholipid bilayer

A
  • electrical insulation
  • control what moves in and out of the cell
19
Q

how is it an electrical insulator?

A

the inside of a bilayer has no water and does not allow water to flow, so charged ions which are always surrounded by water molecules cannot pass

20
Q

which molecules can pass through bilayer

A

small non polar molecules
ex: oxygen and carbon dioxide

21
Q
A
22
Q
A