BIO FINAL: EXAM II

contains embryonic mmbranes

• amnion
• chorion
• allantois

• when something moves in or out (down its concentration gradient)
• moves high to low

solute potential+physical pressure

you dissolve solutes in water

lower water potential

creation of a transmembrane proton gradient, which generates a membrane potential

a source of potential energy that the cell can use to perform work

source to sink

where sucrose is being used

where sucrose is being made

the cells that transport the phloemsap

pressure flow model

• 1. sucrose moves into the sieve tube member by active transport
• 2. that makes water potential in sieve tube member goes down
• 3. water from surrounding tissues enters the sieve tube member
• 4. water coming in generates positive pressure
• 5. at the sink, sucrose leaves the sieve tube member
• 6. this causes the water potential in the sieve tube member to go up
• 7. water leaves

on si practice exam