One of the major differences between DNA and RNA is the sugar, with 2-deoxyribose being replaced by the alternative pentose sugar ribose in RNA. The four bases found in DNA are adenine (abbreviated A), cytosine (C), guanine (G) and thymine (T).ne of the major differences between DNA and RNA is the sugar, with 2-deoxyribose being replaced by the alternative pentose sugar ribose in RNA. The four bases found in DNA are adenine (abbreviated A), cytosine (C), guanine (G) and thymine (T).
Common bile duct stone, also known as choledocholithiasis, is the presence of gallstones in the common bile duct (thus choledocho- + lithiasis). This condition causes jaundice and liver cell damage, and requires treatment by cholecystectomy and/or ERCP. 1  1 Signs and symptoms.  2 Causes.
The cystic duct is the short duct that joins the gallbladder to the common bile duct.It usually lies next to the cystic artery. It is of variable length. It contains 'spiral valves of Heister,' which do not provide much resistance to the flow of bile.ile can flow in both directions between the gallbladder and the common hepatic duct and the (common) bile duct. In this way, bile is stored in the gallbladder in between meal times.