Module 1.2: Water - Properties, solubility, protein folding, pH Flashcards
PROPERTIES
Water is essential for life how?
OBJECTIVE 6
- Important biochemical reactions occur in aqu. env. in cell / body.
- Critical determinant in structure and function of biopolymers: proteins, protein folding, nucleic acids, phospholipids
PROPERTIES
4 Key Components
OBJECTIVE 6
- Water is chemically “sticky”
- Excellent solvent because its polar
- Moderates temperature
- Ice (solid water) floats
PROPERTIES
Water’s properties explained by:
OBJECTIVE 6
Water is POLAR and produces partial charges.
PROPERTIES
Cohesion
OBJECTIVE 5
Water molecules form hydrogen bonds with each other.
PROPERTIES
Adhesion
OBJECTIVE 5
Polarity allws water to attract other polar molecules.
PROPERTIES
Water’s stickiness is important for living creatures:
OBJECTIVE 6
Cohesion and adhesion allow the movement of water through the
vascular tissue of plants.
SOLUBILITY
Water is an excellent solvent for:
OBJECTIVE 6
CHARGED and POLAR substances
* Charged and polar protein parts
* Small alcohols
* Carbohydrates
SOLUBILITY
Water is a poor solvent for:
OBJECTIVE 6
NONPOLAR substances
* Non-polar gases
* Aromatic groups
* Long hydrocarbon chains
SOLUBILITY
Electrolytes
OBJECTIVE 6
Dissociated ions of ionic compounds in a solution.
* Essential for proper cellular function
SOLUBILITY
Large molecules (like proteins) solubility
If ionic and polar regions are present, can be soluble in water.
* Makes cellular biochemistry possible
PROTEIN FOLDING
Water and protein folding
OBJECTIVE 6
In an aqueous solution, macromolecules fold to protect the hydrophobic residues from interacting directly with water.
PROTEIN FOLDING
Location of polar and non-polar groups in protein folding
- Polar groups out
- Non-polar groups in
PROPERTIES
How does water moderate temperature?
OBJECTIVE 6
Hydrogen bonds stablize molecule.
* Changes of temperature require lots of energy.
* High Specific Heat Capacity
PROPERTIES
Specific Heat Capacity
Amount of energy that needs to be put into 1g of a compound or substance in order to increase its temperature by 1 degree.
PROPERTIES
Heat of Vaporization
OBJECTIVE 6
Quantity of heat that a liquid must absorb for 1g to be converted from liquid to gaseous state.
