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:
The worlds developing regions will see 1.2 billion people added, a 20.7% increase; while the population of developed countries will increase a mere 3.3% adding 41 million to the current 1.3 billion people. ... There is a difference of more than ten years between the median age in developing and developed regions.
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Answer:
The cells of living things also get energy by "burning." They "burn" glucose in the process called cellular respiration.
Explanation:
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The primary goal of water-softening ion exchange systems is to remove magnesium and calcium from waters.
<h3>Water hardness</h3>
Waters that contain carbonates of magnesium or calcium are said to be hard. Soft waters have very little or no magnesium or calcium.
Hard waters are economically and domestically undesirable because they form scales in pipes and do not form lather with soaps, among other effects.
Thus, removing the magnesium or calcium is a way of softening hard waters.
One of the ways of softening hard waters is ion-exchange systems.
More on hard water can be found here: brainly.com/question/2666625
