Answer:
1.A single band of intermediate density.
Explanation:
According to semiconservative model of DNA replication, the two strands of one DNA molecule separate at the time of replication and each strand acts a template for a new strand. So, the resulting new DNA molecule has one old strand and one new strand.
Here, the E coli cells were grown originally in 14N medium. So all the DNA molecules had 14N strands. When they were transferred to a 15N medium, only 15N was available then for further replications. In the first round of replication in new medium, all the old 14N strands (14N14N) separated and formed a new strand each using 15N. Hence all the resulting DNA molecules had one 14N strand and one 15N strand (14N15N).
Since 14N is of lighter density and 15N is of heavier density, 14N15N strands will give band of intermediate density. Since after one round of replication all DNA molecules will be 14N15N, there will be only one band of intermediate density.
Answer:
condensation
Explanation:
The water cycle
evaporation--> condensation--> precipitation-->repeat
Answer:
The missing of Taq DNA polymerase will affect the DNA synthesis or polymerization step.
Explanation:
Taq DNA polymerase is also known as termostable DNA polymerase because it is able to exert its catalytic activity at high temperature.
Taq DNA polymerase is used for the 3rd step of polymerase chain reaction which deals with the joining of nucleotides by phosphodiester bond formation.
The missing or lack of Taq DNA polymerase will affect the DNA synthesis step of PCR.
The greatest current threat to the loss of the Earth's biodiversity is global warming. This is because when the ice melts, the cold comes down to us and makes us have rainy summers and very early snow and cold springs and cold autumns. And when the ice melts enough, water will start to come down and flood countries and cities, such as Manhattan. Scientists are predicting that California will break away from America.
