A. prevent cross-contamination.
That would be C
I hope this helped you.
A chromosome is a packaged and organized structure containing most of the DNA of a living organism. Messenger RNA is a large family of RNA molecules that convey genetic information from DNA to the ribosome, where they specify the amino acid sequence of the protein products of gene expression. Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.
Why do we have to start with the lowest magnification to examine a new slide? It is easier to focus on the specimen.
