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10 Cards in this Set
- Front
- Back
The large molecules of all living things fall into four classes. Name them. |
Carbohydrates, lipids, proteins, and nucleic acids. |
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What does it mean if a molecule is amphipathic? |
It has both a hydrophobic region and a hydrophilic region. |
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How does decreasing temperature affect membrane fluidity? |
Closely packed together phospholipids settle and solidify. |
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What is membrane fluidity? |
Membrane fluidity is the ability of lipids and proteins to drift laterally within the protein. |
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How do phospholipids and unsaturated hydrocarbon chains affect membrane fluidity? |
Membranes remain fluid at lower temperatures because kinks in non-polar tails cannot be packed closely together. |
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How does cholesterol affect membrane fluidity? |
Makes membranes less fluid at 37ºC by restraining phospholipid movement (temp buffer). |
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integral proteins |
Penetrate the hydrophobic core of the lipid bilayer. |
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peripheral proteins |
Not embedded in the lipid bilayer, loosely bound to the surface membrane. |
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Distinguish between glycolipids and glycoproteins. |
Glycoproteins are bonded to proteins. Glycolipids are carbohydrates conveniently bonded to lipids. |
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Distinguish between channel proteins and carrier proteins. |
Channel proteins have a hydrophilic channel for molecules/ions to tunnel through. Carrier proteins change their shape to shuttle molecule/ion across the membrane. |