Based on DNA sequences of single genes, genomic analysis has confirmed that prokaryotes are divided into two great lineages: the Bacteria and the Archaea. The latter may be more closely related to the Eukarya
Recount the lines of evidence that support these findings.
Sequence divergence between archaeans and bacteria is considerable, and despite the general morphological similarity of these groups, the Archaea more closely resemble the Eukarya in terms of both the details of DNA replication and the expression (and, in some cases, the structure) of their genes.
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Which of the groups shown above is a functional group that helps stabilize proteins by forming covalent cross-links within or between protein molecules?
A) A B) B C) C D) D E) E
The majority of kidney complications are due to ________
a. gallstones b. diabetes c. constipation d. dehydration e. urinary tract infections
Where is the nucleus of a neuron found?
A. Cell body B. Myelin sheath C. Axon branches D. Dendrites E. Companion cell
Messenger RNAs containing premature stop codons are destroyed by the mechanism of
A) nonstop decay. B) directed RNase activity. C) nonsense-mediated decay. D) error-mediated repair. E) None of these mechanisms.