Thalassemias result from __________ the ?- and ?-globin genes
a. insertions in
b. nonsense mutations in
c. deletions in
d. missense mutations in
e. normal recombination between
Ans: c
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Differences between mitochondrial and E. coli electron transport chains include the following:
A. The E. coli chain contains a different array of cytochromes. B. Higher P/O values are observed in E. coli. C. The electron transport chain does not involve membranes in E. coli. D. The fundamental principles on which they operate are different.
Niche overlap initially leads to:
a. mutualism b. commensalism c. predation d. competition e. parasitism
A serum titer involves
A. determining the highest dilution of serum that produces a visible reaction. B. the Western blot method. C. quantifying the number of infectious particles in a specimen. D. determining the lowest dilution of serum that produces a visible reaction.
The substrate is
A. the material changed by an enzyme. B. a coenzyme. C. the material formed by an enzyme. D. always a protein.