VIBS 422 Exam 3 Questions Answered Correctly Already Passed

VIBS 422 Exam 3 Questions Answered Correctly Already Passed how many pounds of atrazine is applied each year* - Answers 80 million when was atrazine first registered - Answers 1959 what is atrazine used as - Answers an herbicide what are the primary crops atrazine is used in * - Answers corn, sorghum, sugarcane what chemical is atrazine* - Answers chlorotriazine prone to leaching and runoff slow to breakdown in water atattches to dust particles can be detected more than 1000 miles from where it was applied how many pounds of atraztine is percipitated in rainfall each year in the USa* - Answers half a million pounds who banned the use of atrazine - Answers European Union atrazine as a phytotoxin - Answers its mechanism of action is specific to plants in plants what does atrazine target - Answers inhibits photosynthesis via competition with plastoquuinone 2 at its binding site in the process of the EYC atrazine biodegredation - Answers c-cl then ethyl and isopropyl groups catalyzed by hydrolase enzymes called ATzA, AtzB, Atzc end process is cyurnanic acid what is the best charcterized species that utilizes the atrazine biodegrdation mechanism - Answers psedemonas sp. strain ADP atrazine effects on women - Answers atrazine could cause pre term delivrery, growth. reduction of fetus reduces ovulation and reproductive ability pesticide drift - Answers unitentional diffusion of pesticides and the potential negative effects of pesticide application atrazine developmental abnormalities** in frogs - Answers developmental arrest without a shell spine second antennae shell spine noeonatal daphnia what did atrazine stimulate in daphnia magna* - Answers hemoglobin accumulation what were the effects of atrazine on frogs - Answers head tilt unilateral extensor muscle rigidity severe otis interna (inner ear inflammtion) meningitis which EDC caused complete sex reversal** - Answers atrazine hermapgoriditsm complete feminization in zebra fish shifts the sex ration femals are indeed males its a feminizer what did atz do to frog follicles - Answers decreased spawning and increased follicular atresia what does feminization of male gonad mean - Answers development of occytes in the testes or complete ovarian differentiation in genetic males loss of male germ lines get testicular oocytes feminized males could still make viable eggs with unexposed males who do atz exposed male suffer from - Answers decreases test decreased breeding gland sizee demasculanized laryngeal development suppressed mating behavoir suppressed mating behavoir reducded spermatogeensis decreased fertility Hermaphorditism - Answers both sexes in the same organism atz ovarian abnormality - Answers decreased weight of oviduct increased involution of tubular glands increased amount of connective tissue and degeenrating pigmented cells of oviduct what did atz do in rat males - Answers decreased testis weight and testis atrophy reducded testosterone and 3BHSD- affects androgen synthesis which leads to changes in spermatogenesis what edc reduces test and 3BHSD* - Answers atz atz inhibition pathway* - Answers ihibits GnRH release, LH, 5- alpha reductase (no T to DHT) , ACTH, increases aromatase, PRL ABP is inhibited so less DHT can be carried to the body decreases gene transcripition when the edc emerged - Answers prehistoric era from 6000 BC what were the 6 metals used by the prehistoric man - Answers gold- too soft used for decor silver bronze- from copper with tin copper- useful as tool not weopen lead- made into pipes to transport water iron- iron age from the bronze age natural sources of heavy metals* - Answers earths crust volcanic activity forest fires biogenic servies 1st 2 account for the 80%