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.
The predominant symptoms are, 1  Bile duct infection (can cause chills and fever) 2  Fatigue. 3  Intense itching.  Malabsorption (especially of fat) leading to decreased levels of the fat-soluble vitamins, A, D, E, and 1  K. Severe jaundice (causing yellowing of the eyes and/or skin)  Signs of cirrhosis.