Biology, 25.12.2019 06:31 brittanysanders
What is the best explanation for the observation that eukaryotes that seem superficially simple can have much larger genomes (in terms of mass or number of base pairs) than organisms that have complex anatomy, structure, or behavior?
a. alternative splicing and overlapping genes are rampant among eukaryotes. b. some organisms have a tremendous amount of noncoding dna, like repetitive sequences. c. simpler organisms require more chemical defenses against enemies. d. animals with simple body plans are adapted for rapid dna replication.
Answers: 2
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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?
Answers: 1
What is the best explanation for the observation that eukaryotes that seem superficially simple can...
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