BIOL 1201 Lecture Notes - Lecture 6: Dehydration Reaction, Triglyceride, Hydrolysis
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Which of the following statements about water is not true?
Water will hydrogen bond into highly ordered structures or "cages" around non-polar molecules.
The electron-rich oxygen atom of one water molecule can interact with an electron-poor hydrogen on another water molecule to form a hydrogen bond.
Water is a key player in the energetics of the hydrophobic effect.
In an ice crystal water molecules pack into open lattices consisting of five-membered oxygen rings.
At 25 degrees celsius liquid water is about 85% as hydrogen bonded as the water in ice, with each molecule in an average of 3.4 hydrogen bonds.
Which of the following is the best explanation for the hydrophobic effect?
It is caused by the attraction of hydrophobic groups for each other. | ||
It is an entropic effect caused by the tendency of hydrophobic groups to increase their entropy by associating with other hydrophobic groups. | ||
It is an entropic effect, caused by the tendency of water molecules to increase their entropy by excluding hydrophobic groups, which they must otherwise surround with highly ordered structures. | ||
It is caused by the attraction of water for hydrophobic groups. | ||
It is an entropic effect, caused by the tendency of water molecules to increase their entropy by forming highly ordered structures around the hydrophobic groups. |
1)Turgor pressure in plant cells is
A. | a result of the walled cell being in a hypotonic environment. |
B. | due in part to osmosis. |
C. | necessary to keep plants from wilting. |
D. | the force of water against the inside of the cell wall. |
All of the answer choices are correct. 2) Active transport is different from simple diffusion in that active transport
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