During transcription, enzymes bind to a molecule of dna. then, the enzymes unwind and separate the dna's double helical strands. as the molecule unwinds, complementary nucleotides pair with one of the dna strands to form

What kind of action is a cause of air pollution

Me . based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

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?