Fish predominantly excrete nitrogen in what form? Group of answer choices urea all are correct Ammonia uric acid beta-ureidopropionate Flag question: Question 2 Question 2 Tips 2 pts With regards to essential amino acids, humans: Group of answer choices Are more versatile than bacteria as bacteria generally can only synthesise 1, or at most 2, amino acids themselves. Can synthesise all 20 amino acids themselves and therefore no amino acids are essential in the diet. Can make 10 amino acids and therefore have 10 amino acids that are essential in the diet. none of the above Must consume rats in their diet for half of their amino acid requirements Flag question: Question 3 Question 3 Tips 2 pts Transamination of pyruvate (i.e. pyruvate receiving a amine group) yields: Group of answer choices glutamate alanine asparagine glutamine aspartate Flag question: Question 4 Question 4 Tips 2 pts Which statement is correct for aromatic amino metabolism? Group of answer choices Only phenylalanine is essential in the diet Humans can produce tyrosine from hydroxylation of phenylalanine All of the above When cholesterol is hydroxylated it forms tryptophan Humans can make all of the aromatic acids themselves. None are essential in the diet. Flag question: Question 5 Question 5 Tips 2 pts Tyrptophan is a precursor for which neurotransmitter? Group of answer choices caffeine glutamate serotonin dopamine epinephrine