The genes in an operon are
a. each transcribed into their own mRNA molecule.
b. all transcribed into a single mRNA molecule.
c. transcribed in subsets.
d. transcribed as a single unit in prokaryotes, but as individual genes in eukaryotes.
e. located at different locations on the chromosome and so can never be transcribed to the
same mRNA molecule.
B
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The ____ and ____ of rivers are key determinants of their physical habitats
a. flow rate; volume b. size; shape c. flow rate; temperature d. location; volume e. biodiversity; species richness
A proton pump is needed in the lysosomal membrane because:
A. the interior of the lysosome needs to be acidic. B. protons are being moved from low to high concentration. C. protons cannot move across a membrane on their own. D. All of the answer options are correct.
The Meselson-Stahl experiments supported the model of dispersive DNA replication
Indicate whether the statement is true or false
Which respiratory surface lacks physical protection from the external environment?
a. tracheal system tubes b. human lungs c. external gills d. internal gills e. bird lungs