The most efficient control of eukaryotic gene expression is achieved at the level ofa) replication. b) transcription initiation. c) post-transcription. d) translation initiation. e) post-translation.

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:

meiosis is the correct answer

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added