J. ill the cell pictured, there is no net movement of water. The amount leaving

Question

J. ill the cell pictured, there is no net movement of water. The amount leaving the ell and entering the cell is the same. In what type of environment is this cell found? a. Hypertonic b. Hypotonic c. Isotonic d. none of the above 41. Why can nonpolar molecules freely cross the cell membrane while polar molecules require energy? 42. All life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos. It is likely that the primordial environment was acidic. In order for a

Explanation / Answer

1. C (isotonic) is the correct answer.

iso means the same -- the extracellular fluid fluid has the same osmolarity as the cell, and there is no net movement of water into or out of the cell.

2. The plasma membrane consists of hydrophobic and hyrophillic characteristics. Towards the outside, they are hydrophillic, so they can create bond with water. The insidea are hydrophobic, allowing no water inside and keep them tight together due to the polar forces.

An non polar particle (if small), can pass through it because it does not interfere with the hydrophobic/hydrophillic(polar) nature of the plasma membrane. However, polar particles would not have the opportunity to move in, because the insides (hydrophobic) are litterally afraid of water, or charges. don't allow polar substances to pass through.

So only hydrophobic(nonpolar), gases and small particles (nonpolar) can pass through.

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