Which of the following substances is
hydrophobic?
a. canola oil
b. sodium chloride
c. sugar
d. water
e. the potassium ion
A
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The question of whether animal eyes have evolved independently in different organisms or have evolved once from a single organism and then diverged over time is still being actively investigated by evolutionary scientists
A. true B. false
A researcher is studying the integral membrane protein "mysteriase" and chooses to perform an experiment similar to that performed by Frye and Edidin. The researcher fuses a mouse cell expressing mysteriase with a human cell. The fused cell is incubated at 37?C prior to being cooled to 0?C and labeled with a fluorescent antibody against mysteriase. When observed with a fluorescent microscope,
mysteriase is observed to remain on one side of the fused cell. What is the most likely explanation for this surprising observation? A. Mysteriase rigidifies the plasma membrane B. There is an error in the experimental procedure because this result is impossible C. Mysteriase is bound to the cytoskeletal filament D. Mouse cells are less fluid than human cells E. Mysteriase is a flippase enzyme that enhances lipid flip-flop rather than lipid lateral movement
A comet orchid has creamy white-colored flowers and a characteristic "tail" that contains the flower's nectar. This orchid does not emit a scent during daylight hours but is aromatic at night. The comet orchid is most likely pollinated by
A) windy nighttime conditions. B) pollen traveling on animal fur. C) a nocturnal pollinator. D) moisture from cool evenings.
Substrate-level phosphorylation occurs during which of the following stage(s) of glucose catabolism?
A) formation of acetyl-CoA B) lysis stage of glycolysis C) energy-conservation stage of glycolysis D) Krebs cycle E) formation of acetyl-CoA and the Krebs cycle