Given that polyurethane is a huge polymer (mw > > daltons), why is it important that the polyurethanase is a secreted enzyme? if we assume that the polyurethane is the source of energy for the "elvis meltdown! " by stewart, smith and shields page organism, how can material (carbon atoms) from it fi nd its way into the central metabolic pathways of this microbe? what is the "entry point"? what happens after its entry into the metabolic pathway?

Polyurethanase is an enzyme emitted by the microorganism so as to break polyurethane. Since the polymer is a significant wellspring of energy for the life form, it should be separated all together for etpum"s development.

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Polyurethane

It is a polymer made out of organic units and carbamate links join them. While most polyurethanes are thermosetting polymers that don't liquefy when warmed, thermoplastic polyurethanes are likewise accessible. Polyurethanes are available in numerous parts of present-day life. They present a class of polymers that have discovered a far-reaching use in the medical and mechanical fields. Polyurethanes can be found in items such as furniture, coatings, cement, constructional materials, paints, elastomers, filaments and paddings. Polyurethane ought to be curtailed to PUR in consistence with authority German and International benchmarks.

Polyurethanase

It can be defined as such an enzyme which is secreted by microbes and used for the breakdown of polyurethane. In this breakdown process energy is released that is utilized by microorganisms.

Bio-degradation of Polyurethane

In spite of their microbial obstruction, polyurethane is attacked by microscopic organisms however the component to explain its bio-degradation is unknown. There are reports from microscopic organisms and parasites that are equipped for the breakdown of polyurethane yet the examinations about the proteins that assault the plastic are centered around bacterial compounds as it were. The enzyme is of sort esterase and protease for the most part since these chemicals are unspecific and can perceive a few regions in the polyurethane particle and hydrolyze it.

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Subject: Biology

Level: College

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The reason that polyurethane is important as a secreted enzyme is that most exoenzymes roles are to break down lager macromolecules outside of the cell so they are able to enter the cell. Exoenzymes are therefore more effective as large molecules.

If polyurethane is an energy source, it would first be broken down by exoenzymes of the bacteria. Then it would be incorporated into the cell through facilitated diffusion. Due to its rich carbon, the energy source would enter the glycolysis pathway, then the Krebs cycle (for aerobic bacteria). The energy source would be used in the making of ATPs.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

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