1. which statement most accurately describes the process of respiration?
select one:
...
Biology, 26.10.2019 06:43 estermartinez
1. which statement most accurately describes the process of respiration?
select one:
a. it occurs only in plants during the daylight hours and usually involves the exchange of gases.
b. it occurs only in plants during the daylight hours and involves the taking in of preformed organic molecules.
c. it occurs continuously in the cells of all organisms and involves the synthesis of carbohydrate molecules.
d. it occurs continuously in the cells of all organisms and often involves an exchange of gases.
Answers: 1
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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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