This is a macromolecule that holds cell information in a coded form. made of sugar, phosphate and nitrogen-containing bases.

This macromolecule is nucleic acid-deoxyribonucleic acid (DNA).

DNA is the genetic material that carries the hereditary information which provides instructions for how and when to make proteins needed to build and maintain the function of the cells.Beside DNA ribonucleic acid (RNA) is also a variety of nucleic acids, macromolecules made out of units called nucleotides.

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:

d) center of the mid-ocean ridge

give brainleysest

sinserly,

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