The primary reason for the circularization of eukaryotic mRNA through the interaction of proteins bound at the 5' terminus and 3' poly(A) tail is to:
A. sequester unneeded transcripts.
B. prevent the phosphorylation of eIF4G.
C. ensure that the mRNA is fully processed before translation begins.
D. None of the choices is correct.
C
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Matt is studying how the protein transferrin enters cells. He examines cells that have taken up transferrin, and finds clathrin-coated vesicles. What mechanism was used to take transferrin into the cell?
A. Phagocytosis B. Pinocytosis C. Exocytosis D. Receptor-mediator endocytosis
Voltage-sensitive K+ channels are 1,000 times more permeable to K+ than to Na+ because
a. K+ ions are smaller than Na+ ions. b. K+ ions have a lower charge density than Na+ ions. c. a selectivity filter removes the water molecules from K+ ions but not from Na+ ions. d. K+ ions are more concentrated inside the cell than outside the cell.
Fish gills consist of a series of
A) parabronchi. B) interconnected bronchioles. C) spiracles. D) filaments. E) opercula.
Humans are the only hosts of Rickettsia rickettsii.
Answer the following statement true (T) or false (F)