unit two 2B - transport and cell membranes

Question 1

what is co-transport?

Answer 1

co-transport uses a carrier protein which binds two molecules at a time. the concentration gradient of one of the molecules is used to move the other molecules against its own concentration gradient.
e.g co-transport of sodium ions and glucose. sodium ions move into the cell down their concentration gradient which means the glucose moves into the cell too, against its concentration gradient.

Question 2

what are two differences between active transport and facilitated diffusion?

Answer 2

1) active transport moves solute from low to high concentration where as facilitated diffusion is always moves from high to low concentration
2) active transport requires energy where facilitated diffion dosnt its passive.

Question 3

what is active transport?

Answer 3

active transport uses energy to move molecules and ions across a membrane against a concentration gradient.

Question 4

what do you call two solutions with the same water potential?

Answer 4

isotonic

Question 5

what is osmosis?

Answer 5

osmosis is the diffusion of water particles acrss a partially permeable membrane from an area of higher water potential to an area of lower water potential.
pure water has the highest water potential out of all solutions.

Question 6

what do carrier proteins and channel proteins transport?

Answer 6

carrier proteins –> large molecules
channel proteins –> charged particles

Question 7

what is facilitated diffusion?

Answer 7

particles diffuse through carrier or channel proteins in the membrane. it is down a concentration gradient from high to low. this is a passive process

Question 8

whats simple diffusion?

Answer 8

when molecules diffuse directly through a cell membrane

Question 9

what is diffusion?

Answer 9

diffusion is the net movement of particles (molecules or ions) from an area of higher concentration to an area of lower concentration so they diffuse down a concentration gradient. this is a passive process.