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 bile duct is a tube that transports bile from the liver to the small intestine. The gallbladder is attached to the bile duct by a small tube called the cystic duct. Bile is collected in the gallbladder between meals and empties into the bile duct through the cystic duct during a meal.t opens in the part of the intestine called the duodenum into a structure called the Ampulla. Blockage of the bile duct by a cancer or scarring from injury prevents the bile from being transported to the intestine and the bile accumulates in the blood.