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2 years ago

5

In the mid , was the first surgeon to introduce aseptic techniques into the operating room in an effor

t to reduce microbes and prevent infection.

1 answer:

svp [43]2 years ago

5 0

alantic and Semmelweis was the first

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New milestones in environmental policy will most likely deal with long-term issues. true or false

r-ruslan [8.4K]

I believe that the answer is "True"

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3 years ago

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Which of these is NOT a requirement or influence on chemical cycling of inorganic nutrients in a natural ecosystem?

OLga [1]

Answer:

The correct answer is option d.

Explanation:

Chemical cycling illustrates the systems of concurrent circulation of elements between other states, compounds, and substances, and then return to their original state, which takes place in space, and on many objects in space comprising the Earth.

Chemical cycling of the nutrients (inorganic) is needed to maintain the conservation of nutrients on Earth. The chemical cycling of nutrients in a natural system requires a pool for the elements, the activities done by human beings, the biotic community and its food chains, and an exchange pool from which producers extract their nutrients. All the mentioned factors are associated with affecting a chemical cycling in exception to the input of geothermal energy.

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3 years ago

Describe the Watson and Crick model of DNA structure. How did it fit the data provided by Chargaff and the X-ray diffraction pat

icang [17]

DNA model given by Watson and Creek in the year of 1953 gave a very detailed study regarding the structure of B DNA which is valid till date and is essentially corroborating with Chargaff's data and Xray diffraction pattern.

<h3><u>Explanation:</u></h3>

The DNA is the most common nucleic acid found in the living organisms as a genetic material. As stated by Watson and Creek, this DNA contains a double helical structure with two sugar phosphate backbones and the nitrogen bases getting projected from it inwards. The backbones are formed of ribose sugar and phosphate and joined together with a phosphodiester bond. The ribose sugar is attached to phosphates at its 3' and 5' Carbon atoms. The nitrogen bases found in DNA are Adenine, Guanine, Thymine and Cytosine. The Adenine has two hydrogen bonds with thymine and guanine has 3 hydrogen bonds with cytosine.

Each full turn of a helix is 34A and each base pair is 3.4A apart. The distance between two strands of DNA is 20A.

Chargaff's rule regarding the equal amount of adenine and thymine as well as guanine and cytosine is matching with this structure. All the other rules also do match with this DNA structure.

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3 years ago

Which of the following best describes what happens after a lysosome is made in the rough endoplasmic reticulum of a plant cell?

Evgen [1.6K]

The answer is "it begins releasing the enzymes to break down large molecules

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2 years ago

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nignag [31]

Answer:

c

Explanation:

The salinity of the water is increased.

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2 years ago

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