If a new anesthetic were developed that entered the nerve cells efficiently, why would it be important for the substance to be lipophilic (to dissolve in lipids)?
What will be an ideal response?
Only certain types of molecules can cross the cell membrane. Because this anesthetic is lipophilic, it can easily move through the phospholipid bilayer of the cell membrane.
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A bowl of sugar water is very stable. However, cells can rapidly break down sugar into carbon dioxide and water. What is the best explanation for this observation?
A. Glucose becomes more chemically reactive inside a cell. B. The water is activated by the presence of living cells. C. Enzymes in the cell catalyze the breakdown of glucose. D. Living cells make the water warmer, speeding up the reaction. E. Breakdown of glucose has a negative delta G outside of cells, but a positive delta G inside cells. F. Cells use energy to break down glucose.
Methylation regulates transcription
a. via the addition of a methyl group to cytosine bases of DNA. b. via the addition of a methyl group to cysteine residues on RNA polymerase II. c. via the addition of a methyl group to cysteine bases of DNA. d. via the addition of a methyl group to cytosine residues on RNA polymerase II. e. by interfering with the chromatin remodeling process.
Which of the following types of ecosystems would have the lowest percentage of total net primary
productivity?
a. open ocean b. savanna c. swamp and march d. temperate deciduous forests e. tundra
A basidium ________.
A. is found within basidiocarp (fruiting body) B. is club-shaped C. is produced at the tip of hyphae D. All of the choices are correct.