Answer:
A DNA marker
Explanation:
also known as a size standard or a DNA ladder) is loaded into the first well of the gel. The fragments in the marker are of a known length so can be used to help approximate the size of the fragments in the samples.
1# Questions: People who have gene mutations have more treatment options.
2# Question: 20 amino acids
maybe
Explanation: both idk for sure sry i tried
