Answer:
In 1630 at the beginning of European settlement, about 425,000,000 hectares of the US were forested. By 2017, the area of forested land has declined to 300,000,000 hectares. What is the percent decrease of forested land between 1630 and 2017?
1630= 425000000
2017= 300000000
decrease= 125,000,000
percentage decrease= 125000000/425000000 x 100
percentage decrease= 29.41%
Explanation:
Helicase: unzipping the DNA helix
Primase: synthesizing the RNA primer
DNA polymerase III: adding bases to the new DNA chain; proofreading the chain for mistakes
DNA polymerase I: removing primer, closing gaps, repairing mismatches
Ligase: final binding of nicks in DNA during synthesis and repair
Gyrase: supercoiling
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Answer:
A) one intermediate band
Explanation:
Meselson & Stahl experiment on the E.coli bacteria to identify the mechanism of replication in bacteria.
For this, they grew bacteria in a heavy isotope of the nitrogen ¹⁵N which allowed the bacteria to take ¹⁵N in their DNA. They then grew the bacteria into ¹⁴N which allowed the bacteria now to take ¹⁴N in their DNA.
When they allowed the bacterial population to replicate their genome for one generation they found that their genome contained both types of isotopes of nitrogen in their DNA through centrifugation.
Since after the centrifugation only one band was observed which contains both the form of the nitrogen, therefore, the band was called intermediate band with intermediate density.
Thus, Option-A is the correct answer.