Bellringer-December 11, 2014 • 1. If a cell contains 85% water and is placed into a environment which is 50% water. Is the CELL hypotonic or hypertonic? In which direction will the water move, into the cell or out of the cell? • 2. A cell contains 85% water and is placed into a solution which contains 90% water. Is the SOLUTION in the environment hypotonic or hypertonic? In which direction will the water move? • 3. A cell contains 95% water, the environment outside the cell contains 45% solutes. Is the cell in a hypotonic or hypertonic environment? • 4. A cell containing 25% solutes is placed into a solution which contains 35% solutes. Which direction will the water move, into the cell or out of the cell? • 5. A plant cell containing 95% water is placed into a 10% salt solution. Is the salt solution hypotonic or hypertonic? Which direction will the water move?
18
Embed
Bellringer-December 11, 2014 1. If a cell contains 85% water and is placed into a environment which is 50% water. Is the CELL hypotonic or hypertonic?
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Bellringer-December 11, 2014• 1. If a cell contains 85% water and is placed into a environment which is 50% water.
Is the CELL hypotonic or hypertonic? In which direction will the water move, into the cell or out of the cell?
• 2. A cell contains 85% water and is placed into a solution which contains 90% water. Is the SOLUTION in the environment hypotonic or hypertonic? In which direction will the water move?
• 3. A cell contains 95% water, the environment outside the cell contains 45%
solutes. Is the cell in a hypotonic or hypertonic environment?
• 4. A cell containing 25% solutes is placed into a solution which contains 35% solutes. Which direction will the water move, into the cell or out of the cell?
• 5. A plant cell containing 95% water is placed into a 10% salt solution. Is the salt solution hypotonic or hypertonic? Which direction will the water move?
2
ACTIVE TRANSPORT
3
Remember….• Passive Transport does NOT require energy• Types of passive transport:
• Diffusion• Facilitated Diffusion• Osmosis
Active Transport • Requires energy! • Molecules move against (up) their concentration
gradients (from LOW concentration to HIGH)• Cells use energy to power this process• Two types: Endocytosis and Exocytosis
4
Active transport• Uses energy to move solutes against
their [ ] gradients across the cell membrane–Energy required usually ATP
• Carrier proteins are used…NEVER channel proteins– Ex: sodium-potassium pump
Passive vs. Active Transport
Figure 7.17
1. PROTEIN PUMPS•Protein Pumps -transport proteins that require energy to do work•Examples: • Na+/K+ Pumps are
important in nerve responses
• H+ (proton) pump
Sodium Potassium Pumps (Active Transport using
proteins)
Protein changes conformational shape to move molecules: this