Question

1 what type of transport does not require energy?
provide an example of one process that is a type of passive transport?

1. what are the two main components of the cell membrane?
2. how does oxygen cross into the cell?

how does glucose cross into the cell?

1. what is the purpose of a channel protein?
2. what are the two parts of a phospholipid:
3. define diffusion.
4. define osmosis:
5. what is a solute?
6. hypertonic solutions have more / less solute. hypotonic solutions have more / less solute. (circle)

one the image above, which side is hypertonic? left side | right side

1. what will happen to a cell placed in a hypertonic solution?

Explanation:

1. Passive transport doesn't need energy. Examples are diffusion, osmosis, and facilitated diffusion.
2. Cell membrane has phospholipids (forms bilayer) and proteins (for transport, signaling).
3. Oxygen crosses by simple diffusion (small, non - polar). Glucose by facilitated diffusion (needs carrier protein) or active transport (against concentration gradient).
4. Channel proteins form pores for specific substances (e.g., ions) to cross membrane.
5. Phospholipid has phosphate head (hydrophilic) and fatty acid tails (hydrophobic).
6. Diffusion is movement of molecules from high to low concentration.
7. Osmosis is diffusion of water across semi - permeable membrane.
8. Solute is substance dissolved in solvent (e.g., salt in saltwater).
9. Hypertonic has more solute; hypotonic has less. (Need image to determine side.)
10. Cell in hypertonic solution loses water (shrivels, crenates in animal cell; plasmolyzes in plant cell).

Answer:

1. Passive transport. Example: diffusion.
2. Phospholipids and proteins.
3. Oxygen: simple diffusion. Glucose: facilitated diffusion or active transport.
4. Form pores for specific substances to cross membrane.
5. Phosphate head and fatty acid tails.
6. Movement of molecules from high to low concentration.
7. Diffusion of water across semi - permeable membrane.
8. Substance dissolved in solvent.
9. Hypertonic: more. Hypotonic: less. (Side: depends on image.)
10. Loses water (shrivels, crenates or plasmolyzes).