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Biology, 22.06.2019 13:00, mimivenga
Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?
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Biology, 22.06.2019 14:30, brendaesme
49 ! how are energy cycles and growth cycles related?
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Biology, 22.06.2019 14:30, assassin42
Explain how the parts of the peripheral nervous system work with the central nervous system to produce a response to the stimulus
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Biology, 22.06.2019 15:50, Nigward666
We all have different forms of genes from our parent(s).what are these different forms called? a. alleles b. characters c. dna d. resources
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In respiration, the electrons come from the oxidation of organic molecules, and is the final electr...
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