lec 5

• definition:

  cotransport

  same direction
• term:

  one in, one out

  countertransport
• what are the two types of transport?

  primary (pumps)

  secondary (coupled transport)
• true or false

  secondary transport does NOT require ATP

  TRUE
• what are the ion pumps for primary active transport?

  Na+

  K+

  Ca2+

  Mg2+
• True or false

  secondary active transport is directly driven by energy from ATP

  FALSE

  indirectly driven by energy from ATP
• secondary active transport:

  energy is released from ____ __________

  ion diffusion
• secondary active transport:

  diffusion results from previous ______ __________ of the ion


  active transport
• secondary active transport:

  energy drives a ______

  pump
• Is sodium-linked glucose transport an example of countertransport or cotransport?


  cotransport
• True or False

  sodium-linked glucose drives H+ movement against gradient

  FALSE

  sodium-proton exchange drives H+ movement against gradient
• secondary active transport: sodium-linked glucose transport

  drives ________ movement against gradient

  glucose
• what is the second step in the sodium-linked glucose transport?


  Na+ binding creates a high-affinity site for glucose
• what is the 3rd step in the soduim-linked glucose transport?

  glucose binding changes carrier conformation which makes the binding sites now face the ICF
• ICF/ECF concentrations differ because of _______ ______

  active transport
• what is osmosis?


  diffusion of water through a membrane
• more solute =

  options:

  more water

  less water

  less water
• True or false

  during osmosis, membrane is freely permeable in water


  True
• total solute concentration of a solution

  osmolarity
• iso-osmotic


  same
• hypo-osmotic 


  solution has lower concentration
• hyperosmotic


  solution has higher concentration
• osmolarity of ICF/ECF is ____

  300mOsm
• mOsm


  Milliosmole
• osmolarity:

  solute particle displaces ____

  water