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BIOA01H3 Lecture Notes - Lecture 14: Atp Hydrolysis

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ivoryhorse803
3 Mar 2011
School
UTSC
Department
Biological Sciences
Course
BIOA01H3
Professor
Mark Fitzpatrick

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BIOA01H3 Full Course Notes
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Document Summary

What are the requirements for life: supply of replicators- self-reproducing molecules, replicator copy must be subject to error, supply of free energy for metabolism/growth/reproduction/movement, partial isolation from external environment. Selection is really important allows for the ability of different concentration of material to be found on different sides of the membrane. composed of 3 macromolecules: lipids www. notesolution. com. are insoluble in water: non polar hydrocarbon molecules go away from water, held by weak hydrophobic forces. Fluidity: crucial for function due to lipid, phospholipid can move laterally within the bilayer. move, flip: types of hydrocarbon tails (unsaturated) less packed- leaky ; vegetable oil saturated fatty acid tail (more packed, steroid cholesterol. has different effect on membrane fluidity at differ temp www. notesolution. com. Final exam notes biology: good cholesterol made by body to keep membrane secure, packs the spaced in unsaturated membrane, membranes are more dynamic at temp; cholesterol fills the space to prevent too much movement.

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Related Questions

Fill in the blank assignment

Biological membranes are primarily formed from two types oforganic molecules, (16)______, composed of amino acids and(17)_____, composed of phosphates, glycerol and fatty acids.Membranes are (18)___ ____ to molecules allowing some to freelypass through and restricting or preventing the passage of others.Molecules may cross membranes on their own moving from areas ofhigher to lower concentration, with no expenditure of externalenergy, in a process called (19)____. Protein molecules that spanthe membrane may assist or carry other molecules across themembrane, (20)_____ _____, also from areas of higher to lowerconcentration. (21)____ _____ moves molecules across membranes fromareas of lower to higher concentration with the use of energy inthe form of ATP. As opposed to the process of passive transport,illustrated by answers (19) and (20), molecules move against their(22) ______ _______.

If you compare two situations on either side of a cellularmembrane, they are said to be (23)_____ if their soluteconcentrations are equal. Solutions that have higher soluteconcentrations are (24)_____ when compared to solutions with lowersolute concentrations, (25)______. If molecules or substances aretoo large to pass through membranes on their own or with the use ofprotein carriers, vesicles may help to move these materials in orout of the cell as vesicles fuse with or pinch off membranes. This(26)____ ____ of materials is called (27)____ if materials aremoved into cells. The transport of lage solids or "cell-eating" is(28)_____. Entry of liquids is termed (29)____ or "cell drinking."Movement of materials out of the cell is (30)_____.

1. predict the direction of water movement based on differences in solute concentrations. Use the terms osmotic pressure, hypotonic, isotonic, and hypertonic
2. Why do membranes have to be selectively permeable?

3. What determines whether a particular substance can diffuse (simple or facilitated) through a membrane?

4. What mechanisms drive molecules across membranes? Use the terms concentration gradient, (facilitated) diffusion and active transport.
5. Which parts of the plasma membrane proteins do you expect to be hydrophobic or hydrophilic? Justify your answer.
concise and short answers pls

Biological membranes are primarily formed from two types oforganic molecules, (16)______, composed of amino acids and(17)_____, composed of phosphates, glycerol and fatty acids.Membranes are (18)___ ____ to molecules allowing some to freelypass through and restricting or preventing the passage of others.Molecules may cross membranes on their own moving from areas ofhigher to lower concentration, with no expenditure of externalenergy, in a process called (19)____. Protein molecules that spanthe membrane may assist or carry other molecules across themembrane, (20)_____ _____, also from areas of higher to lowerconcentration. (21)____ _____ moves molecules across membranes fromareas of lower to higher concentration with the use of energy inthe form of ATP. As opposed to the process of passive transport,illustrated by answers (19) and (20), molecules move against their(22) ______ _______.

If you compare two situations on either side of a cellularmembrane, they are said to be (23)_____ if their soluteconcentrations are equal. Solutions that have higher soluteconcentrations are (24)_____ when compared to solutions with lowersolute concentrations, (25)______. If molecules or substances aretoo large to pass through membranes on their own or with the use ofprotein carriers, vesicles may help to move these materials in orout of the cell as vesicles fuse with or pinch off membranes. This(26)____ ____ of materials is called (27)____ if materials aremoved into cells. The transport of lage solids or "cell-eating" is(28)_____. Entry of liquids is termed (29)____ or "cell drinking."Movement of materials out of the cell is (30)_____.