The sequence of eras beginning wit the earliest era and proceeding forward to the most recent era in the geologic timescale is
A. Cenozoic - Archean - Mesozoic
B. Archean - Mesozoic - Cenozoic
C. Paleozoic - Mesozoic- Proterozoic
D. Archean - Paleozoic - Proterozoic
E. Mesozoic - Cenozoic - Paleozoic
C. Paleozoic - Mesozoic- Proterozoic
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In the lab you isolate a Chlorella mutant that is unable to switch xanthophyll pigments into the inactive, non-heat-dissipating form. If you released that mutant into a small pond shaded by trees, would the mutation spread, and why?
A. No, light absorbed by xanthophylls is not used to make ATP or NADPH. B. No, the xanthophylls prevent the production of reactive oxygen species. C. Yes, the xanthophylls prevent the production of reactive oxygen species. D. Yes, the heat released by the xanthophylls would warm up the cells and enhance photosynthesis. E. No, mutations never spread in nature.
Tears protect the eyes by
A. stimulating opsonization. B. inflammation. C. flushing and lysozyme. D. flushing and lysozyme and vasodilation. E. vasodilation.
Dogs have a diploid chromosome number of 78 . How many chromosomes do their gametes have?
a. 26 b. 39 c. 78 d. 156 e. 234
Which of the processes named here is the least likely to contribute to the evolution of genetic diversity of bacteria and archaea?
A. Sexual reproduction B. Horizontal gene transfer C. Mutation D. Binary fission