Which one of these pairs is not correctly matched?
A) coagulase; lyses fibrin clots
B) siderophore; traps iron
C) leukocidin; lyses WBC membranes
D) collagenase; breaks down connective tissue
E) IgA protease; digest antibodies
Ans: A) coagulase; lyses fibrin clots
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Of the following sequences, which one reflects the best scientific knowledge about the succession of Homo species from the past until the present?
A. Homo heidelbergensis ® Homo habilis ® Homo sapiens ® Homo erectus B. Homo habilis ® Homo heidelbergensis ® Homo erectus ® Homo sapiens C. Homo heidelbergensis ® Homo sapiens ® Homo erectus ® Homo habilis D. Homo sapiens ® Homo heidelbergensis ® Homo habilis ® Homo erectus E. Homo habilis ® Homo erectus ® Homo heidelbergensis ® Homo sapiens
The defense response against a mismatched transfusion is called ____
a. precipitation b. immunization c. agglutination d. ABO typing e. transfusion allergy
An endemic species is one that
A. is found in only one particular place or region. B. requires a very large territory. C. has been cultivated by humans. D. can be used as an indicator species. E. has a disproportionate effect on its ecosystem.
GTPase activity is involved in the regulation of signal transduction because it
A) increases the available concentration of phosphate. B) decreases the amount of G protein in the membrane. C) hydrolyzes GTP binding to G protein. D) converts cGMP to GTP. E) phosphorylates protein kinases.