Unit 1
Transition Mechanisms
Topic 1.0
Why is Water Biologically Important?
Should Knows
Should Know's
Define: cohesive, adhesive, transpiration, surface tension, lattice, ion
Subtopic
Surface Tension: property allowing liquid to resist external force
Lattice: A pattern created by molecules in a crystal
Cohesive: Water molecules stick to each other.
Ion: a charged atom or particle
Should Do's
1. Describe how the molecular structure of water contributes to its properties.
2. Differentiate between cohesive and adhesive properties.
3. FULLY explain why water is biologically important.
1. the waters role as a solvent helps cells transport
2. Cohesive is when water molecules stick with each other, while adhesive is when water molecules stick to other substances, like in the example of Xylem.
3. universal solvent, high heat compacity ( maintains constant temperature ) , a polar covalent molecule that is both adhesive and cohesive and forms a lattice
Topic 1.8 Why Carbon is important?
Topic 1.12 What are Lipids?
Topic 1.17 What is Diffusion?
Topic 1.5 Active Transport
Should Knows & Do's
What is Active Transport?
Definition: The movement of ions or molecules across the cell membrane into a region of higher concentration.
Five Types
Ion pumps
Channels that use the ATP hydrolysis energy to transfer ions from one side of a membrane to the other aganist their electrochemical gradient.
Sodium Potassium Pump
Moves sodium and potassium ions aganst large concentration gradients
Proton Pumps
Pathway for acid and secretion in gastric parietal cells
Cotransport
Coupling of the down hill diffusion of one substance to the uphill.
Bulk Transport
The movement of large amounts of molecules across a membrane.