Why are nucleotides added in the 5 to 3 direction?
DNA replication goes in the 5′ to 3′ direction because DNA polymerase acts on the 3′-OH of the existing strand for adding free nucleotides.
Which enzyme is responsible for unzipping the DNA double helix?
Helicase
What happens if you are missing a chromosome?
When parts of chromosomes are missing, a number of syndromes can occur. These syndromes are called chromosomal deletion syndromes. They tend to cause birth defects and limited intellectual development and physical development. In some cases, defects can be severe and affected children die during infancy or childhood.
What would Hershey and Chase have concluded if both radioactive?
What would Hershey and Chase have concluded if both radioactive 32P and 35S were found in the bacteria in their experiment? The virus’s protein coat was not injected into the bacteria. The virus’s DNA was not injected into the bacteria. Genes are made of protein.
How did Hershey and Chase know that it was infected with DNA?
Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur? They labeled the DNA of a bacteriophage with radioactive phosphorus & found that after the bacteria were infected the radioactive phosphorus was in the bacteria.
What did Griffith’s experiments prove?
In Summary: The History of DNA Frederick Griffith’s experiments with strains of Streptococcus pneumoniae provided the first hint that DNA may be the transforming principle. Avery, MacLeod, and McCarty proved that DNA is required for the transformation of bacteria.
What killed the mice in Griffith’s experiment?
When Griffith mixed heat-killed, harmful bacteria with live, harmless bacteria and injected the mixture into mice, the mice died. A bacteriophage is larger than a bacterium.
What did Hershey and Chase conclude why?
Hershey and Chase concluded that DNA, not protein, was the genetic material. They determined that a protective protein coat was formed around the bacteriophage, but that the internal DNA is what conferred its ability to produce progeny inside a bacterium.