You have isolated a previously unstudied protein, identified its complete structure in detail, and determined that it catalyzes the breakdown of a large substrate. You notice it has two binding sites
One of these is large, apparently the bonding site for the large substrate; the other is small, possibly a binding site for a regulatory molecule. What do these findings tell you about the mechanism of this protein?
A) It is probably a structural protein that is involved in cell-to-cell adhesion.
B) It is probably an enzyme that works through allosteric regulation.
C) It is probably an enzyme that works through competitive inhibition.
D) It is probably a cell membrane transport protein-like an ion channel.
E) It is probably a structural protein found in cartilage or skeletal tissue.
Answer: B
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What is the difference between cross- and self-fertilization?
A) In cross-fertilization the pollen from one plant is used to fertilize the egg of another plant. B) In cross-fertilization the pollen from one plant is used to fertilize the egg from the same plant. C) In self-fertilization the pollen from one plant is used to fertilize the egg from another plant. D) In cross-fertilization insects are used to pollinate the plants, whereas in self-fertilization the investigator pollinates the plants.
Methylation affects protein synthesis by
affecting which of the following proteins?
a. histones b. RNA polymerase c. DNA polymerase d. hemoglobin e. transcription factors
Which of the following has a gut with two openings,
a mouth, and an anus? a. cnidarians b. annelids c. flatworms d. sponges e. placozoans
Which biome has the fewest kinds of species?
a. tundra b. taiga c. grassland d. desert e. It is not possible to determine this based on the information provided.