Answer:
I'm pretty sure that the answer is d :)
Explanation:
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The radioisotope 16-N will most likely be found in proteins in the ribosome, cell membrane and carbohydrate-metabolism related proteins.
This is because, proteins are synthesized from amino acids which individually require nitrogen for their own synthesis. Also, proteins make up more of the E. coli biomass than do the purine and pyrimidine nucleotides whose synthesis also require nitrogen.
Microorganisms such as the E. coli bacteria, have certain nutritional requirements for growth. These requirements include carbon source, nitrogen source and growth factors.
A nutrient medium provides these nutrients for microbial growth.
Nitrogen is required by microbial cells such as E. coli for use in the synthesis of proteins, amino acids, DNA, and RNA.
A radioisotope 16-N in a nutrient medium for growing E. coli cells will be used in the synthesis of these biomolecules.
However, because proteins are found more abundantly in E. coli cells, the radioisotope 16-N will mostly be found in cellular proteins such as ribosomes, cell membrane and carbohydrate-metabolism related proteins.
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Answer:
CRISPR-Cas9 is a DNA modification technique derived from a bacterial defense mechanism.
This breakthrough innovation allows the deletion and insertion of genes in a simple, fast and efficient way, much like "DNA scissors".
The CRISPR-Cas9 method is increasingly used in laboratories because it has several advantages over the DNA cutting enzymes developed before it.
First advantage, it is much easier to use (compared to other gene-editing tools). It has already allowed several teams of researchers to target several genes at once, including in human cells.
Other major advantages resulting from the simplicity of the system: its speed and its low cost. The CRISPR-Cas9 method takes only a few days (instead of a few months) and is at least ten times less expensive than those used before.
CRISPR-Cas9 is therefore a tool of disconcerting ease to modify the genome of many types of cells (to produce a protein for example), in bacteria, plants, animals and perhaps one day in humans.
Ash can be harmful to an environment. It mostly depends on how much ash there is though. If a volcano erupted such as Mt. St. Helen's then yes that can harm an environment. Ash can cover the sky and block out the sun for days before disappearing and that will affect the life of plants
They are called <span>nucleotides. </span>
