Answer:
The hershey chase experiment on bacteriophages showed the genetic information is carried in <u>DNA.</u>
Explanation:
In 1952 Alfred Hershey and Martha Chase provided evidence that DNA is the genetic material. These scientists carried out an experimental work with the T2 virus, a bacteriophage that infects the Escherichia coli bacteria, which reproduces by attaching itself to the outer wall of the bacteria, injecting its DNA into it where it replicates and directs, the synthesis of phage proteins. Phage DNA is encapsulated within proteins and produces phages, which lyse or break the cell and releasing phage from the progeny. They used radioactive forms (isotopes) of phosphorus and sulfur. A radioactive isotope can be used as a marker to identify the location of a specific molecule, because any molecule that contains the isotope is radioactive and therefore easy to detect. The DNA contains phosphorus, but doesn't contain sulfur, therefore phosphorus-32 was used to mark the DNA, instead the protein has sulfur, but not phosphorus, so sulfur-35 was used. Hershey and Chase found that sulfur-35 is outside the cell while phosphorus-32 was inside, indicating that DNA was the physical support of the inheritance. This work allowed the scientists to conclude that it's the DNA and not the protein that enters the bacteria during phage reproduction and that only the DNA is transmitted to the phage of the progeny.
Answer: C. Measles
Explanation:
Measles is a contagious disease which is caused by the Rubeola virus. It is an airborne disease which spread easily through sneezes and coughs of the infected person. It may also caused due to direct contact with the nasal secretions. It can spread when people share a common living space and lack immunity to fight against the disease causing symptoms.
The symptoms include cough, inflamed eyes, red rashes all over the body and begins with fever.
On the basis of the above information, measles is the disease due to which the client must be placed in a respiratory isolation so as to prevent the infection to other people.
The answer is B. Because bio mass energy & solar energy are both renewable
Answer:
A person has the genotype of 9, 9 on one of his microsatellite loci.
An electrophoresis was conducted on the PCR products of this locus. Which lane on the gel below is most likely the result of the PCR fragments
Lane: A
Explanation:
DNA´s negative charge, given by phosphate groups is carried applying electrophoresis, on an agarose gel matrix, so that the equally-sized fragments put up at the same spot on the gel. After applying power, DNA fragments migrate to the positive electrode due to the enforced power, that way smaller fragments travelling faster, and larger fragments travellying slow, are size-sorted
We can see the gotten diagram for this person:
Column A as the most likely PCR fragments.
L= size ladder
L A B C D
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Because comets are darker colored so they need light to shine on them to be seen in the dark skies of space.