BioChem 3 627 P1
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- What are the five functions of biological membranes?
-
Define cell boundaries
Divide cells into compartments
Organize complex reaction sequences
Act in signal reception and transmission
Act in energy transformation - What major component is found in yeast cell plasma membranes?
- Ergosterol
- Liposomes have an _______?
- Aqueous cavity
- There are ____ types of integral membrane proteins.
- 6
- Type 1 Integral Proteins have the _______ end on the inside and the ________ end on the outside.
- Carboxyl, Amino
- Type 2 Integral Proteins have the _______ end on the inside and the ________ end on the outside.
- Animo, Carboxyl
- Type III integral membrane protiens has multiple _______ transmembrane proteins
- linked
- Type IV integral membrane proteins has multiple _______ transmembrane proteins
- unlinked
- Name 3 types of Beta-barrel structures.
-
FepA
Alpha-Hemolysin Toxin
Maltoporin - The inner portion of Beta-barrels are __________
- Hydrophillic
- What are eight examples of membrane fusion?
-
Budding of vesicles from golgi complex
Exocytosis
Endocytosis
Fusion of endosome and lysosome
Viral Infection
Fusion of sperm and egg
Fusion of small vacuoles(plants)
Separation of two plasma membranes at cell division - Simple diffusion is for ___________ and travels ___________.
- nonpolar compounds only, down a concentration gradient
- Facilitated diffusion requires a ____________ and travels ____________.
- protein, down an electrochemical gradient.
- Primary Active transport requires ___________ and travels ______________.
- ATP, against an electrochemical gradient.
- Secondary active transport requires ___________ and it travels ____________ and is driven by ____________.
- no ATP, against the electrochemical gradient, ions moving down its gradient.
- Ion channels travel _________ and may be _________ or ________.
- down an electrochemical gradient,gated by a ligand, ion
- Ionophore-mediated ion transport sends ________ down an _________
- ions, electrochemical gradient.
- If C1 is > C2 (C=concentration) and molecules can travel across the membrane. The net flow of molecules will travel from ______ to ______ by means of _______.
- C1,C2, diffusion.
- If C1 is > C2 (C=concentration) and molecules can flow across the membrane, the system is ______ in equilibrium.
- not
- If C1 = C2 (C=concentration) and molecules can travel across the membrane. The system is at ________ and there is _____ net flow of molecules.
- equilibrium, no
- If Vm is > 0, then one of the sides is _______ charged than the other, thus there is a ______ flow of ions across the membrane.
- more, net
- At Vm = 0 the system is at ________ and there is ____ ___ flow of ions.
- equilibrium, no net
- FepA is used to transport ________.
- Iron
- Maltoporin is used to transport ________.
- maltose.