Which of the following is not found in DNA?
A) uracil
B) cytosinne
C) adenine
D) thymine
Ans: A) uracil
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How does a macrophage destroy a pathogen?
A. production of antibodies B. phagocytosis C. secretion of histamine D. opsonization
A woman with apparently normal health (mother) and a colorblind man (father) had a son with hemophilia and a normal daughter. If the genes for both traits are on the X chromosome, which statement about this family is true?
A. The maternal grandfather is colorblind. B. The daughter cannot be a carrier for colorblindness. C. The maternal grandfather is not hemophilic. D. There is a 50% chance that the maternal grandfather is hemophilic. E. The father is a carrier of hemophilia.
What drives the movement of carbon dioxide from tissue into the bloodstream?
A. active transport against a concentration gradient B. facilitated diffusion down a concentration gradient C. simple diffusion down a concentration gradient D. facilitated diffusion against a concentration gradient E. the heart pumping the carbon dioxide into the bloodstream
A ____________________ organism is one that carries a gene that has been transferred to it from
another species. Fill in the blank(s) with the appropriate word(s).