Which is the most efficient at initiating the classical pathway of the complement cascade?
A. IgA
B. IgD
C. IgM
D. IgE
C
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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.
If a given protein’s level peaks early in G1, but is absent before the G2 transition, what can be inferred about its possible role in regulating the cell cycle?
a. This protein inhibits Cdk1. b. This protein activates Cdk1. c. This protein inhibits Cdk2. d. This protein activates Cdk2. e. This proteins is involved in DNA synthesis.
The similar body shape and color of dolphins and sharks is an example of ____
a. variations in master genes b. homologous structures c. anatomical homology d. convergent evolution e. divergent evolution
If the following are placed in the order of occurrence, which would be the third step?
a. diapedesis b. digestion c. formation of a phagosome d. formation of a phagolysosome