Which of the following statements about the nucleus is true? a. the nucleus usually contains a nucleolus region which is where mitochondria assembly begins. b. the nucleus is surrounded by cell membrane that lets materials in and out. c. the nucleus is the site of protein assembly. d. the nucleus stores the coded instructions for making the cell’s proteins.

thinking it would be d not too sure but i think it's right

no i don't feel that humans have oversubscribed some medications

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: