Some resources that might help with Problem II:Guts

Msba, a bacterial channel that ressembles the CFTR chloride channel in cystic fibrosis
(you'll need the Chime plugin to see this)  (MSBA)

Introduction and overview of digestion:

National Digestive Diseases Information Clearing House, part of the National Institute of Diabetes and Digestive and Kidney Diseases

National Institutes of Health Genes and Disease site.
Look under digestive or nutritional and metabolic diseases.
A commercial site with links for the medical community

NIH bookshelf

Ion channel diseases

Thiamin at the Pauling Institute Micronutrient Center

Action Potential Simulation