BIOL 103 Lecture Notes - Lecture 4: Conformational Change, Bile Acid, Dont

• School: Queen's University
• Department: Biology
• Course: BIOL 103
• Professor: Virginia K Walker

Document Summary

We cannot store amino acids as humans so we must convert them into deaminated aa"s through enzymes. Ammonia is produced in the liver momentarily but it"s toxic so it"s converted to urea and. Requires atp urea is our final nitrogenous waste. Many fish just have ammonium as their final toxic product, no urea cycle. Sharks and rays expend energy to convert ammonium to urea and excrete some of it as urine but also keep some in their tissues so they are isotonic with the surrounding sea which is why they don"t drink water. You need to dialise the shark against some type of liquid to get rid of the urea (in order for shark steaks not to taste like urine soak it in milk) Bony fish are hypotonic water comes out of gills and they are in danger of dehydration and must drink water, their urine is very concentrated.