Given that polyurethane is a huge polymer (mw >>100,000 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 organism, how can material (carbon atoms) from it find its way into the central metabolic pathways of this microbe? what is the entry point ? what happens after its entry into the metabolic pathway?.

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

Does anyone have some ideas for an herbalism or culinary project? i need to start my graduation project so i'm prepping for it

Panthers and leopards prey on deer in an ecosystem. for unknown reasons, the population of leopards increased drastically. what are the likely effects of this change on the species? 1. more food for panthers and more competition for leopards 2. less food and more competition for panthers 3. fewer deer and more competition for panthers 4. more food for deer and less competition for panthers and leopards 5. more food for leopards and less competition for panthers