Which of the following statements are true? A All compounds are molecules, but not all molecules are compounds.
B All molecules are compounds, but not all compounds are molecules.
Something is either a compound or molecule, it can never be both.
D
Molecules and compounds mean the same exact thing.

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:

it marks things for degradation via the proteasome. it alters there celluar location.

condenser is used to focus in the light microscope.