Se forman radicales libres cuando los organismos consumen oxígeno para metabolizar glucosa y formar moléculas energéticas. ross hardison, de la universidad estatal de pensilvania, dijo: "mantener el oxígeno bajo control y al mismo tiempo usarlo para producir energia es uno de los mayores equilibrios logrados en la evolución de la vida de la tierra". ¿qué quiso decir?

yes u ya what do u mean oh really i thought sooo ok then goodbye. At least i answerd.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

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: