If a test cross is performed involving 3 linked genes (A,B and C), the most frequent phenotypes of the offspring are "Abc" and "aBC" and the least common offspring are "abc" and "ABC". What was the genotype in the correct order of the heterozygous individual used in this test cross?
a) Abc/aBC
b) BAC/bac
c) bcA/BCa
d) bAc/BaC
Ans: d) bAc/BaC
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A) catalyze the transformation of inorganic nitrogen species for biosynthesis. B) assimilate nitrite. C) conserve energy from the transformation of inorganic nitrogen species. D) catalyze the incorporation of inorganic nitrogen species into biomolecules.
Bacteria that resist killing by complement proteins are termed
A. carriers. B. serum resistant. C. balanced pathogens. D. mutualistic. E. carriers AND serum resistant.
Sporadic cancers result from
A) recessive or dominant mutation in a somatic cell. B) recessive or dominant germline mutation. C) mutation in a sperm or oocyte. D) exposure to a cancer-causing virus.
Which of these statements concerning the functional characteristics of the heart chambers is NOT correct?
A. During ventricular diastole, blood collects in the right and left atria. B. At the very beginning of ventricular diastole, blood flows directly from the atria into the relaxed ventricles. C. 70% of ventricular filling occurs before the atria contract. D. During ventricular systole, the atrioventricular valves close. E. During ventricular diastole, the semilunar valves open.