Over evolutionary time, photosynthesis has effectively poisoned itself by producing an oxygenic atmosphere because __________
A. rubisco is an oxygenase
B. rubisco is a carboxylase
C. O2 is a strong oxidant
D. rubisco is an oxygenase and O2 is a
strong oxidant
E. rubisco is an oxygenase and O2 is a
strong reductant
D
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A chemical reaction that has a positive ?G is correctly described as
A. endergonic. B. endothermic. C. enthalpic. D. spontaneous E. exothermic.
If flipping two coins, what is the probability that both will land on “heads”?
a. 1/2 b. zero c. 1/4 d. 1/8
Systematics is the study of
A. describing and classifying organisms, and their evolutionary relationships. B. reproductive isolation. C. naming and classifying organisms. D. the biogeographic and distributions of species that have diverged. E. similarities and evolutionary relationships among species.
A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are a little below normal, and no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is
the likeliest diagnosis for this child? A) Bruton-type agammaglobulinemia B) Grave's disease C) severe combined immune deficiency (SCID) D) systemic lupus erythematosus (SLE) E) hemolytic disease of the newborn