RNA is a very similar molecule to DNA, and only has two chemical differences. The overall structure of RNA and DNA are immensely similarâone strand of DNA and one of RNA can bind to form a double helical structure.NA also uses a different set of bases than DNAâ adenine, guanine, cytosine and uracil, instead of adenine, guanine, cytosine and thymine. Chemically, uracil is similar to thymine, differing only by a methyl group, and its production requires less energy.
Symptoms of a blocked bile duct include: 1  Yellowing of the skin (jaundice) or eyes (icterus), from the buildup of a waste product called bilirubin. 2  Itching (not limited to one area; may be worse at night or in warm weather) 3  Light brown urine. 4  Fatigue. Weight loss.  Fever or night sweats.
In regards to the discussion of the dilated common bile duct, I recently went through an Ultrasound and an MRI with imaging dye and no cancer was found. However, I was not given a cause or a cure for the dilation and will have to have follow-up via blood draws every 3 months and another MRI in a year.