microRNAs (miRNAs) are small noncoding RNAs that play important roles in posttranscriptional gene regulation. In animal cells, miRNAs regulate their targets by translational inhibition and mRNA destabilization. Here, we review recent work in animal models that provide insight into the diverse roles of miRNAs in vivo.icroRNAs (miRNAs) are small noncoding RNAs that play important roles in posttranscriptional gene regulation. In animal cells, miRNAs regulate their targets by translational inhibition and mRNA destabilization. Here, we review recent work in animal models that provide insight into the diverse roles of miRNAs in vivo.
Polymer Definition. A polymer is a large molecule made up of chains or rings of linked monomer units. Polymers usually have high melting and boiling points. Examples: PVC (poly vinyl chloride), polystyrene, cellulose.olymer Definition. A polymer is a large molecule made up of chains or rings of linked monomer units. Polymers usually have high melting and boiling points. Examples: PVC (poly vinyl chloride), polystyrene, cellulose.
Plastics and polymers Polymers What is a Polymer? A polymer is a molecule that consists of certain type of arrangement of atoms that is repeated over and over. The result is a very large molecule that can consist of 2000 or more of the base compound.olyethylene (PE) Polyethylene is a simple example of a polymer, and is one of the most common and widely used polymers. H H H H H H H H H H H H â â â â â â â â â â â â -C â- C â-C â- Câ- C â- Câ- C â- Câ- C â- Câ-C â- C - â â â â â â â â â â â â H H H H H H H H H H H H Polyethylene.