The polymerase chain reaction (PCR) is used as a tool for:
A. breaking down DNA for analysis
B. amplifying the amount of DNA to provide a large sample
C. fragmenting DNA into smaller pieces
D. rearranging the gene sequences in isolated fragments of DNA
E. extracting DNA from nuclei
B. amplifying the amount of DNA to provide a large sample
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Class II MHC genes code for
A. all HLA antigens. B. certain secreted complement components. C. receptors located primarily on macrophages and B cells. D. self receptors recognized by T lymphocytes. E. All of the choices are correct.
Cultured skin lacks which of the following?
a. melanocytes b. sweat glands c. oil glands d. other differentiated structures e. all of these
The first person to suggest a general definition of species was
A. Charles Darwin. B. Carolus Linnaeus. C. John Ray. D. Joseph Priestly.
You see acid-fast oocysts in a fecal sample from a patient who has diarrhea. What is the MOST likely cause?
A) Cryptosporidium B) diatoms C) Entamoeba D) Giardia E) Taenia