Which of the following statements about body cells is TRUE?
a. All lymphocytes are leukocytes, but not all leukocytes are lymphocytes.
b. All leukocytes are lymphocytes, but not all lymphocytes are leukocytes.
c. Leukocyte and lymphocyte are different types of red blood cells.
d. Leukocyte and lymphocyte are different names for the same cell.
e. MHC proteins are not unique between vertebrate species.
A
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An ideal vector
A. may be a plasmid or bacteriophage. B. has a restriction enzyme recognition site. C. contains an origin of replication. D. contains a selectable marker. E. All of the choices are correct.
Why are cDNA libraries considered so valuable? What will be an ideal response?
Meselson and Stahl separated DNA from different generations using:a
density gradient centrifugation. b. gel electrophoresis. c. an electron microscope. d. differential radioisotope labeling. e. None of these
Why are most autotrophs referred to as the producers of the biosphere?
What will be an ideal response?