A woman uses a home pregnancy test kit that tests for hCG hormone in urine. She knows this is a type of antibody assay from the kit brochure. Antibodies reacting with the hormone produce two lines on the test strip. What specific type of antibody assay does this represent?
A) a direct immunofluoresence test
B) a complement fixation test
C) an immunochromatographic assay
D) an ELISA
E) a neutralization assay
C
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Water molecules are polar with ends that exhibit partial positive and negative charges. These opposite charges allow water molecules to attract each other through:
A. ionic bonds. B. covalent bonds. C. hydrogen bonds. D. peptide bonds.
The type of leaf arrangement in Figure 34-1 is characteristic of:
a. ashes.
b. maples.
c. catalpas.
d. beeches.
e. buckeyes.
All of the following statements regarding stem cells are true, EXCEPT
A. Embryonic stem (ES) cells differentiate into pluripotent cells. B. Pluripotent stem may be reverse-engineered from adult stem cells. C. Totipotent stem cells differentiate into embryonic stem cells. D. Totipotent stem cells may differentiate into placental cells. E. Totipotent stem cells may only be harvested from the blastocyst stage.
Plague includes
A. septicemic form – called black death. B. bubonic form – buboes develop. C. pneumonic form – sputum highly contagious. D. disease control – control of rodent population. E. All of the choices are correct.