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The cell membrane is made of a p__________________ b___________________. 13. The cell membrane is...
12. The cell membrane is made of a p__________________ b___________________.
13. The cell membrane is _________________permeable. This means that ______________________________________________________________________________________.
14. Diffusion always causes particles to move from a region of _______________ concentration to a region of _____________ concentration.
15. Does a cell use energy when molecules diffuse in or out of the cell down the concentration gradient?______________
16. ____________________ requires energy (ATP) to transport molecules against a concentration gradient.
17. In ____________________ and _________________ no energy is used. Which one needs a helper to get things across? ______________________
13. The cell membrane is _________________permeable. This means that ______________________________________________________________________________________.
14. Diffusion always causes particles to move from a region of _______________ concentration to a region of _____________ concentration.
15. Does a cell use energy when molecules diffuse in or out of the cell down the concentration gradient?______________
16. ____________________ requires energy (ATP) to transport molecules against a concentration gradient.
17. In ____________________ and _________________ no energy is used. Which one needs a helper to get things across? ______________________