Answer:
The correct answer is option B.
Explanation:
On seeing the question, it is clear that it is based upon the concept of semi-conservative theory for the replication of DNA. It is mentioned that when the bacteria were grown on N-15, the mass was 55 fg. Now, after two generations, the DNA would comprise N-14 and the mass of them will be 5.4 fg.
The average mass would be = 5.4 + 5.5 / 2 = 10.9 / 2 = 5.45 fg. The mass of the bacteria isolated from the culture would possibly contain both the masses. That is, the mass of DNA with N-14 only would be 5.4 fg, and the mass of DNA with both N-15 and N-14 would be the average, that is, 5.45 fg.
As human travel increases , the number of introduced species likely increases .
<h3>What is species and how human travelling can increase the number of introduced species?</h3>
- As humans will start moving more from one place to another there will be more species number.
- The number of introduced species will increase sharply seeing the increase in the number of human population doing migration and travelling.
- The breakdown of regional distinctiveness leads to increase in the travelling period of the humans .
- And most importantly the introduction of new species will increase and will be impacted by the human who have come from elsewhere for either travelling purposes or migration purposes.
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Answer:
The invention of active drug loading method improves the encapsulation efficiency of some ionizable hydrophilic drugs (weak acid or weak base). The specific method is to construct pH gradient inside and outside the liposome, and then use the solubility difference of ionizable drugs under different pH conditions to realize the drug loading. With this method, the drug encapsulation rate can reach more than 95% and the drug loading can reach about 10%.
Explanation:
https://www.creative-biostructure.com/liposomes-in-drug-delivery-491.htm
I’m pretty sure the answer is C
The question is incomplete but antivirals, cells of the immune system and antibodies can work against viral infection.
<h3>What is a viral infection?</h3>
A viral infection is any disease caused by a virus that is able to infect and produce harm to a suitable host.
The immune system consists of different barriers to fight against viral infections, one of which is composed of immune cells and antibodies that work together to recognize and destroy pathogenic viruses.
For example, the cells that can work against a viral infection include cytotoxic T cells, macrophages and NK cells.
In conclusion, antivirals, cells of the immune system and antibodies can work against viral infection.
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