Subtelomeres are blocks of homologous DNA sequences close to the ends of chromosomes
In a worldwide population of humans, when sequences of chromosomes 4q and 10q subtelomeres were analyzed only 17 4q and 8 10q haplotypes were found among African, European, and Asian groups. Which of the following might be among the results or conclusions of this analysis? A) finding that few or no interchromosomal exchanges can occur among these chromosomes
B) a conclusion that all haplotypes were present before the human population migrated from Africa
C) reporting that haplotype polymorphism shows no response to natural selection
D) finding greater than 80% variation between homologous ends of chromosomes in humans
E) a conclusion that assigning chromosomal origin of repeat arrays by using specific restriction enzymes is possible only in a population with the same ethnic origin
B
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Old pine stumps are dug up, split into pieces and sold as "fatwood". Fatwood is used as a fire starter. Why is this done?
A. The wood in the stumps is porous and dry, thus it burns easily. B. The high concentration of volatile organic compounds makes the wood flammable. C. Pine bark does not absorb water and is flammable. Clarify Question What is the key concept addressed by the question? Gather Content What do you already know about pine? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The three main (abdominal) accessory organs of the human digestive system are the gallbladder, _______
A) liver B) large intestine C) gallbladder D) pancreas E) esophagus
Skin grafts between identical twins are more successful than grafts between more unrelated individuals. Why?
A. Identical twins share the same uterine environment. B. Twins are exactly matched in age. C. Identical twins have identical HLA alleles. D. Identical twins are the same sex. E. None of these is true.
________ makes it possible to trace phylogenies among microbial groups for which there is no fossil record
A) Convergent evolution B) Using vertebrate outgroups C) Horizontal gene transfer D) Molecular systematics