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.
Quick Answer. A positive result on a WBC, or leukocyte, esterase test is considered abnormal, according to MedlinePlus. This raises the possibility of a urinary tract infection. False positives are sometimes caused by vaginal secretions or an infection caused by the Trichomonas vaginalis parasite. Continue Reading.