The biggest engineering challenge of today is: A. creating a qualitity of life environment that does not have a negative impact on the environment.

B. creating a qualitity of life environment that does have a negative impact on the environment.

C. building homes that put nature above human comfort.

this protocol describes a detailed procedure for intracellular flow cytometry staining.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: