Answer:
4.14516129 g/mL
Explanation:
The density can be found with the following formula.
where 
is the mass and 
is the volume.
We know the mass is 25.7 grams. We must find the volume.
The volume is equal to the volume of water that is displaced. Subtract the initial volume from the final volume.
⇒ final volume - initial volume
The initial volume is 35.5 mL and the final volume is 41.7 mL.
⇒ 41.7 mL - 35.5 mL
⇒ 6.2 mL
The volume of the aluminum piece is 6.2 mL.
Now we know the mass and the volume.
Substitute the values into the formula.
The density of the aluminum sample is 4.14516129 g/mL
Main sequence starts maybe
A
Explanation:
The coiling up of DNA with the help of histone proteins - to what is called heterochromatic regions- is part of gene regulation. This makes genes inaccessible to RNA polymerase that makes mRNA from the genes. When the genes are exposed by DNA unwinding, these genes are transcribed and the resulting mRNAs are translated by ribosomes into proteins.
The DNA never unwinds completely, but rather does so region by region, because if it does so it would become so long that it wouldn't fit in the nucleus or cell.
