All of the following are macromolecules EXCEPT
A) DNA
B) cellulose
C) glucose
D) starch
B) cellulose
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Based on what you know about eukaryotic cells, what is one of the arguments against using RNA as the genetic storage molecule?
A. Because RNA uses uracil instead of thymine, it cannot hold genetic information. B. RNA has a negatively charged sugar phosphate backbone. C. The structure of RNA does not allow for double-stranded base pairing. D. There is no current mechanism to package enough RNA to encode all the information needed by the cell. E. The secondary structure of RNA prevents its replication before cell division.
Consider the phylogenetic tree shown above. Geographic labels indicate the origin of humans sampled for mtDNA sequence analysis. Chimp is the outgroup. Which of the following statements is correct?
A. The tree supports the "out of Africa hypothesis" for the origin humans because it implies that the common ancestor of all the humans is of African origin. B. The tree does not reveal anything about the geographic original of humans. C. The tree supports the multi-regional hypothesis because there are four independent populations. D. The closest relative to the Kenyans are the English. E. The Chinese share a more recent common ancestor with the Ethiopians than the Kenyans.
Common vectors used to transfer a piece of DNA into a cloning host are
A. bacteriophages. B. artificial chromosomes. C. viruses. D. plasmids. E. All of the choices are correct.
Which of the following is part of the middle ear?
A. semicircular canals B. pinna C. auditory canal D. malleus E. cochlea