In humans, identical twins are possible because _____
A) cytoplasmic determinants are distributed unevenly in unfertilized eggs
B) extraembryonic cells interact with the zygote nucleus
C) early blastomeres can form a complete embryo if isolated
D) the gray crescent divides the dorsal-ventral axis into new cells
C
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Which is the simplest of all levels of organization?
A. atom B. cell C. organ D. organism E. population
Alagille syndrome
What will be an ideal response?
In a direct ELISA, the reporter enzyme
A) is bound to the detection antibody and chemically modifies an added substrate to generate a colorimetric or chemiluminescent change. B) reacts directly with the antigen the assay is seeking. C) is bound to the detection antibody. D) chemically modifies an added substrate to generate a colorimetric or chemiluminescent change. E) reacts directly with the antigen the assay is seeking and chemically modifies an added substrate to generate a colorimetric or chemiluminescent change.
Mutualism is a relationship
A. that provides benefits for both members, sometimes to the point that one cannot live without the other. B. where only one member derives benefit from the other. C. where one member of the relationship may kill the other. D. where one member of the relationship benefits without hurting the other. E. where it is difficult to prove the benefits or disadvantages one member of the relationship may provide for the other.