Explanation:
The DNA could be dried -through the process of lyophilization- or stored, as a precipitate of ethanol, in liquid nitrogen (temperatures below -80 degrees Celsius). The aim is to reduce water in the stored samples as much as possible because the water can be involved in natural hydrolytic reactions (depurination, depyrimidination, deamination, and hydrolytic cleavage) that could degrade the nucleic acids of the DNA.
If the DNA is stored while being used regularly it is not advisable to store it as a precipitate of ethanol. It should be stored in aqueous form but in a slightly alkaline pH of about 8.5 to prevent acid-catalysed degradation processes.
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11. Yo compro el carro para Pablo. Yo se lo compro. - lo is used for masculine nouns
12. Ella da el papel a ti. Ella me lo da.
13. Ella compra la manzana para Javier. Ella se la compra.
14. Nosotros vendemos el pan a las personas. Nosotros se lo vendemos.
C, a zygote is produced through fertilization. hope this helps
