The supersecondary structure (motif) most likely to contain a heptad (or leucine) repeat would be:
A. a Greek key.
B. a ?-?-?.
C. a helix-turn-helix.
D. a coiled-coil.
E. a four-helix bundle.
D
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In which of the following tissues would one expect to see a lot of tight junctions?
a. red blood cells b. kidney glomeruli c. epithelial tissue of the urinary bladder d. alveoli in the lungs
The cerebral hemispheres communicate with each
other by means of the a. cerebral cortex. b. corpora cardiaca. c. corporothalamus. d. corpus callosum. e. centrosome.
The open sunlit water in a lake with its suspended
phytoplankton is the __________ zone. a. epipelagic b. limnetic c. littoral d. profundal e. epilimnion
The greater resolution of the electron microscope compared to the compound microscope is due to the longer wavelengths of the electrons used to examine specimens
Indicate whether the statement is true or false