Microscope help scientists learn about the different types of cells

Cells in different organs, such as the brain and the heart, have different functions because

mojhsa [17]

<span>A. the same DNA molecule is expressed differently.</span>

7 0

3 years ago

The hershey chase experiment on bacteriophages showed the genetic information is carried in ____________.

Maksim231197 [3]

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.

4 0

4 years ago

In which phase of meiosis will sister chromatids separate and move to opposite ends of the cell

Kitty [74]

Anaphase ll, stage of meiosis ll.

Hope This Could Help!!

5 0

3 years ago

By which process do plants contain carbon from the atmosphere

gregori [183]

the answer is the carbon cycle

5 0

3 years ago

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Which of the following would be a reasonable conclusion if hair was found to have a drug in the root but not in the rest of the

bagirrra123 [75]

Drugs use different mechanisms to incorporate and fixate into the hair, and these are useful to determine if a person is currently consuming drugs or not, and for how long. Option B) Drug use is currently happening.

<h3>How are drugs incorporated into the hair?</h3>

Several studies have been done to explain drug incorporation mechanisms in hair. Among different mechanisms, the most significant ones are,

Active or passive diffusion from blood to the dermal papilla from which hair grows.
Through sweat and other secretions.
From the environment that might deposit drugs on hair.

Usually, before making a drug analysis, hair must be washed to avoid considering external environmental drugs deposited on hair (the last option).

Once drugs incorporate into the hair, they bond to different components composing highly stable complexes that can not be altered for several years. In fact, drugs can remain in the hair for hundreds of years.

According to this information, if after the analysis drugs were only found in the hair root, it might suggest that drugs are recently and currently being consumed.

Option B is correct. Drug use is currently happening.

You can learn more about hair drug analysis at

brainly.com/question/11332268

brainly.com/question/6235304

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6 0

1 year ago

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