Which lineage includes the tuatara as one of its only two living members?
a. Squamata
b. Testudines
c. Sphenodontia
d. Amphibia
Ans: c. Sphenodontia
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Which of the following genetic problems is
NOT being addressed by gene therapy?
a. Down syndrome b. cystic fibrosis c. hemophilia d. immune disorder e. cancers
Blood found at crime scenes is commonly used as a source of DNA. Which component of blood provides the DNA?
1.red blood cells 2.white blood cells 3.plasma 4.all of the choices
What can happen when a complement protein encounters an antibody-antigen complex marking a pathogen?
A) The protein can mark the pathogen for destruction by T cells. B) The protein can destroy the pathogen. C) The protein can coat the pathogen to inactivate it. D) The protein can remove the antibody for use elsewhere.
Forests help to regulate the global climate by
A) releasing oxygen B) absorbing carbon dioxide C) absorbing pollutants D) emitting ozone E) preventing soil erosion