Which is most likely to cause genome evolution in mammals with small population sizes?
A. Purifying selection on synonymous mutations and positive selection on non-synonymous mutations
B. Accumulation of synonymous mutations and purifying selection against non-synonymous mutations
C. Positive selection on nonsynonymous mutations and accumulation of synonymous mutations
D. Purifying selection on synonymous mutations and an accumulation of non-synonymous mutations
Answer: B. Accumulation of synonymous mutations and purifying selection against non-synonymous mutations
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During the process of eukaryotic mRNA degradation, all of the following occur except:
A. The poly(A) tail is lengthened. B. The 5' cap is removed. C. The exosome degrades the molecule to component nucleotides. D. Localization to processing bodies occurs.
When an AA glyptodont mates with an Aa glyptodont, will any of their offspring have yellow shells?
a. Yes b. No
The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia Both male and female hybrids exist, but when they mate among themselves, they are rarely successful in producing offspring. What can you infer from this information?
A) Postzygotic isolation exists between the two frog species. B) Prezygotic isolation exists between the two frog species. C) These two species are likely in the process of fusing back into one species. D) The hybrids form a separate species under the biological species concept.
Which of the following statements about post-translational modifications is false?
A) Additional inorganic factors could be added. B) Post-translational modifications can include the addition of extra amino acids. C) Post-translational modifications are often required for a protein to function. D) Post-translational modifications provide a way for cells to regulate gene product functionality. E) Additional organic factors could be added.