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VIBS 422 EXAM 2 PRACTICE QUESTIONS AND ANSWERS 100% PASS

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VIBS 422 EXAM 2 PRACTICE QUESTIONS AND ANSWERS 100% PASS What are plasticizers? - ANSWER-Plasticizers are additives that are incorporated into a material to increase its flexibility by weakening the bonds so the polymer chains can move more freely relative to one another and polymer becomes les...

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  • November 11, 2024
  • 26
  • 2024/2025
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VIBS 422 EXAM 2 PRACTICE QUESTIONS

AND ANSWERS 100% PASS


What are plasticizers? - ANSWER✔✔-Plasticizers are additives that are incorporated into a material to

increase its flexibility by weakening the bonds so the polymer chains can move more freely relative to

one another and polymer becomes less stiff.


The two most common plasticizers used today in PVC are? - ANSWER✔✔-DEHP and DINP


What is the chemical name of Phathalate? - ANSWER✔✔-1,2-benzene-dicarboxylic acid


What are the physical properties of DINP? - ANSWER✔✔-superior anti heat, anti-cold, and anti-volatile

properties


What are the physical properties of DIDP? - ANSWER✔✔-low volatile properties, anti-heat and anti-aging

(for the product) properties and low insulation properties


River that was cleaned up and then recontaminated with phthalates from storm water runoff? -

ANSWER✔✔-Duwamish River


Commencement Bay - ANSWER✔✔-$103 million superfund cleanup


-phthalate recontamination ongoing


How can we be exposed to phthalates? - ANSWER✔✔--inhalation: phthalates erode off of products &

contaminate air


-ingestion: drinking polluted water due to plastics

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-absorption: contact with plastics that are made of DEHP


-medical procedures: fluids and drugs in plastic bags, dialysis tubing, heart bypass surgery, and blood

transfusion products


-Work related: jobs that create a lot of contact with DEHP


-Food: baked goods, highest levels found in milk and cheese


-cosmetics, perfumes


List any 5 toxic effects of phthalates in females? - ANSWER✔✔--elevated serum estradiol levels


-advanced onset of puberty


-increased ovarian and uterine weights


-uterine malformations


-reduced fecundity


What are 4 major symptoms of Phthalates Syndrome? - ANSWER✔✔--leydig cell abnormalities


-dysgenesis of leydig cells and seminiferous tubules


-undescended testes


-spermatogenic failure and infertility


Describe toxic effects of phthalates on male reproductive function - ANSWER✔✔--decrease in anogenital

distance (AGD)


-disrupts testicular descent and development of a small and indistinct scrotum




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-DEHP disrupts and decreases spermatogenesis and lowers the intra-testicular and plasma testosterone

levels by directly acting on leydig cells


What was the agent used in Vietnam? - ANSWER✔✔-Agent Orange


What is the toxin in Agent Orange - ANSWER✔✔-TCDD


Phthalate metabolism: DEHP is oxidized to form MEHP; MEHP is metabolized by different oxidation

reactions. - ANSWER✔✔-TRUE


The symptoms of phthalate syndrome are leydig cell abnormalities, undescended testes, and

spermatogenesis failure - ANSWER✔✔-TRUE


Who discovered the first DDT in 1939? - ANSWER✔✔-Paul Muller


Which is not a most common 2nd gen pesticide? - ANSWER✔✔-BPA


What 4 crops account for 70% of insecticides in US? - ANSWER✔✔-corn, cotton, wheat, soy beans


(T/F) DDT is excreted in urine, feces, or breast milk. - ANSWER✔✔-true


ID this EDC: - ANSWER✔✔-phthalate


What EDC is a nonsteroidal estrogen given to women to avoid pregnancy complications? - ANSWER✔✔-

DES


How is DES eliminated from the body? - ANSWER✔✔-through the biliary excretion in feces


(T/F) DES binds to androgen receptors. - ANSWER✔✔-false


What is the half life of DES? - ANSWER✔✔-primarily 3-5 hours; 2-3 days due to entero-hepatic

recirculation


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