Problem 3
What is the Haber process?
Problem 8
REFLECT AND APPLY Metabolic cycles are rather common (Calvin cycle, citric acid cycle, urea cycle \() .\) Why are cycles so useful to organisms?
Problem 9
RECALL What is the relationship between \(\alpha\) -ketoglutarate, glutamate, and glutamine in amino acid anabolism?
Problem 12
RECALL What is the difference between glutamine synthetase and glutaminase?
Problem 14
RECALL What cofactors are involved in one-carbon transfer reactions of amino acid anabolism?
Problem 20
REFLECT AND APPLY Proteins contain methionine but not \(\alpha\) -amino\(n\) -hexanoic acid. The only structural difference is the substitution of \(-\mathrm{CH}_{2}-\) for \(-\mathrm{S}-\) Both groups are similar in size and hydrophobic character. Why is methionine more advantageous than \(\alpha\) -amino-n-hexanoic acid?
Problem 26
RECALL Which amino acids in the urea cycle are the links to the citric acid cycle? Show how these links occur.
Problem 31
RECALL When amino acids are catabolized, what are the end products of the carbon skeletons for glucogenic amino acids? For ketogenic amino acids?
Problem 32
RECALL Will an amino acid be glucogenic or ketogenic if it is catabolized to the following molecules? (a) Phosphoenolpyruvate (b) \(\alpha\) -Ketoglutarate (c) Succinyl-CoA (d) Acetyl-CoA (e) Oxaloacetate (f) Acetoacetate
Problem 37
REFLECT AND APPLY Why is it better, when running a marathon, to drink a beverage with sugar for energy rather than one with amino acids?
