Proteins, nucleic acids are best example of natural polymers. Similarly cellulose is also a natural polymer which acts as main structural component of plants. Usually natural polymers are composed by condensation polymerisation with the elimination of water molecule.
Drug-Laboratory Test Interactions. False-positive urine immunoassay screening tests for phencyclidine (PCP) and amphetamine have been reported in patients taking venlafaxine. This is due to lack of specificity of the screening tests. False positive test results may be expected for several days following discontinuation of venlafaxine therapy. Confirmatory tests, such as GC/MS will clear that misconception up asap...or if you are not using pcp and your dr is sceptical.
If you take a urine drug screening test, WELLBUTRIN may make the test result positive for amphetamines. If you tell the person giving you the drug screening test that you are taking WELLBUTRIN, they can do a more specific drug screening test that should not have this problem.f you take a urine drug screening test, WELLBUTRIN may make the test result positive for amphetamines. If you tell the person giving you the drug screening test that you are taking WELLBUTRIN, they can do a more specific drug screening test that should not have this problem.