The decline of the eugenics movement in the U.S. in the early 20th century resulted from ____
A. its misuse for social and political purposes by the Nazis
B. the lack of knowledge of the cell theory
C. the lack of understanding of natural selection
D. the idea that most human traits are controlled by single genes
E. all of these
A
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The ratio of toxic dose to therapeutic dose is called the
A. therapeutic index. B. phenol coefficient. C. susceptibility quotient. D. toxicity index.
Before a pathogen can be destroyed in the antibody-mediated process, a T helper cell must recognize
an __________ on the surface of a macrophage. a. antigen-MHC complex b. antibody c. interleukin d. HLA group e. antigen
Which plasma membrane component provides mechanical strength and maintains the correct amount for rigidity and flexibility?
A) cholesterol B) phospholipids C) protein D) triglycerides E) carbohydrates
Colorless plastids that store starch in the roots of plants are
A. chromoplasts. B. amyloplasts. C. chloroplasts and chromoplasts. D. chloroplasts. E. thyloplasts.