Viral DNA can be inserted into the genome of bacteria by manipulating a specific enzyme known as DNA ligase. 
<h3>What is DNA ligase?</h3>
This is a special enzyme found in humans and other forms of DNA. The role of the DNA ligase enzyme is to fuse together distinct strands of DNA. By manipulating this enzyme, scientists have achieved genetic modification. 
Therefore, we can confirm that due to the successful manipulation of an enzyme known as DNA ligase, scientists have been able to insert viral DNA into the genome of bacteria.
To learn more about enzymes visit: 
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Passive Transport: Simple Diffusion
Diffusion across a cell membrane is a type of passive transport, or transport across the cell membrane that does not require energy. Remember that the cell membrane is a phospholipid bilayer. Although the inside and the outside of a cell are both water-based, there is a hydrophobic region in the middle, and this is an important barrier to anything large, charged, or hydrophilic. Molecules that are hydrophobic, just like the hydrophobic region, can pass through the cell membrane by simple diffusion.
Therefore, simple diffusion is the unassisted passage of small, hydrophobic, nonpolar molecules from a higher concentration to a lower concentration. Very small molecules can slip through the cell membrane, too, even if they are hydrophilic - just like a few ants might crawl through a crack in the wall just because they're tiny.
 
        
        
        
Answer:
The scheme of the tautomers of cytosine, guanine and thymine are found in the attached file
Explanation:
The primary imine-amine tautomerism occurs in heterocyclic compounds where hydrogen may be forming the amino group (primary amine form) or migrate to adjacent nitrogen (imine form), may occur in some nitrogenous bases such as cytosine. Thymine shows double lactam-lactymal tautomy (where hydrogen migrates from the nitrogen atom to the oxygen atom of the heterocycle oxo group (lactam form) and vice versa (lactose form)), and guanine and cytosine can both.
 
        
             
        
        
        
Answer:
B but i might be wrong i dont think its A or D though
 
        
                    
             
        
        
        
Answer:An increase in these gases in the atmosphere enhances the atmosphere's ability to trap heat, which leads to an increase in the average surface temperature of the Earth. As a result, the Earth's average surface temperature is kept at about 15°C by the blanket of atmosphere that surrounds it.
Explanation: