DNA is the genetic material of living beings and is present in nucleus of eukaryotic cells. DNA carries genetic information and is transcribed into mRNA in nucleus. The mRNA leaves nucleus and enters cytoplasm to serve as template for protein synthesis. Hence, the observed organic molecule is DNA.
"DNA" is the one among the following choices given in the question that is the organic molecule described in the question. The correct option among all the options that are given in the question is the third option or option "C". I hope that this is the answer that has actually come to your desired help.
The plasma membrane is described as a fluid mosaic model because its made up of a phospholipid bilayer, allowing it easily to bend and move along without breaking or ripping the membrane due to the hydrophobic and hydrophilic poles of the bilayer.