Question

1. how do you determine the quality of the dna?

a. $od_{230}/od_{260}$ b. $od_{260/280}$ c. $od_{280/260}$

Explanation:

Step1: Understand DNA absorption properties

DNA absorbs UV light. \(OD_{260}\) measures DNA absorption. Proteins absorb at \(OD_{280}\).

Step2: Analyze ratio significance

The \(OD_{260/280}\) ratio is used. A pure DNA sample has a ratio of ~1.8. Values lower indicate protein contamination. Values higher may indicate RNA contamination.

Step3: Rule out other options

\(OD_{230/260}\) is more for detecting organic contaminants. \(OD_{280/260}\) is not the standard ratio for DNA quality determination.

Answer:

B. \(OD_{260/280}\)