Banded iron formations provide evidence of oxygen in the atmosphere. Banded iron formations are sedimentary rocks composed of alternating thin layers formed of iron oxide minerals, such as magnetite and hematite and silica rich minerals such as, chert and iron silicates. Most geologists agree that banded iron formations were precipitated from sea water when oxygen, produced by cyanobacteria, reacted with iron dissolved in sea water.
Have more than one franchise or location within the nation or country.
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Answer:
Antibiotics cannot kill viruses because bacteria and viruses have different mechanisms and machinery to survive and replicate. The antibiotic has no “target” to attack in a virus.
Explanation:
The meselson-stahl experiment demonstrated that dna replication produces two DNA molecules each composed of the nitrogen isotopes.
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What was the conclusion of the meselson-stahl experiment?</h3>
Based on observations and experimental results, Meselson and Stahl concluded that DNA molecules can reflect semi-conservatively. Investigation of semi-conservative nature of replication of DNA or the copying of the cells, DNA failed to cease there.
1958, Matthew Meselson and Franklin Stahl carried out an test on E. coli which divides in 20 minutes, to take a look at the replication of DNA. 15N (heavy) and 14N (normal) are isotopes of nitrogen, which may be outstanding primarily based totally on their densities through centrifugation in Caesium chloride (CsCl).
Read more about the Caesium :
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I think it is extrusive but I am not completely sure
