Question

question 2 of 10
researchers want to use edna to look for an invasive species in a waterway. which of these steps should they do first?
a. cut dna into small pieces.
b. sort dna into bands on a gel.
c. precipitate dna in each sample.
d. amplify the amount of dna.

Explanation:

When using eDNA (environmental DNA) to detect an invasive species in a waterway, the first step is to precipitate the DNA in each sample. Precipitation helps in concentrating and isolating the DNA from the water sample. Cutting DNA into small pieces (A) is typically done later in processes like DNA sequencing preparation. Sorting DNA into bands on a gel (B) is part of gel - electrophoresis which is used for analyzing DNA fragments after other steps. Amplifying the amount of DNA (D) (e.g., through PCR - Polymerase Chain Reaction) is done after the DNA has been isolated and precipitated.

Answer:

C. Precipitate DNA in each sample.