Why do amphipathic molecules line up at a water surface?
What will be an ideal response?
Polar groups attract one another
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Digestive secretions with a pH of 2 are characteristic of the _____
A) small intestine B) stomach C) pancreas D) liver E) mouth
Korarchaeota ____
a. includes halophiles b. includes psychrophiles c. diverged very early in Archaean evolution d. includes halophiles and thermophiles e. diverged very late in Archaean evolution
To test whether the XFF signal system is similar to that of epinephrine, you microinject a nonhydrolyzable analogue of GTP into an XFF-responsive cell. If the XFF mechanism is similar to that of epinephrine, you would expect the cellular response to be
A) blocked completely. B) prolonged. C) delayed. D) 50 percent of normal. E) It is not possible to predict without knowing how many receptors are present on the cell.
Which of the following does not cause a mutation?
A. evolution B. failure of DNA repair systems C. metabolic activity D. UV radiation E. replication errors