What is biliary atresia? Biliary atresia is a relatively rare disease that begins in early infancy and affects about one in every 10,000 to 20,000 infants. In biliary atresia the bile duct that leads from the liver to the intestine becomes damaged preventing bile from leaving the liver. In the early stages the bile duct outside the liver is mainly affected, but in later stages bile ducts inside the liver are also damaged.
Section 6.3 Viruses: Structure, Function, and Uses. A virus is a small parasite that cannot reproduce by itself. Once it infects a susceptible cell, however, a virus can direct the cell machinery to produce more viruses. Most viruses have either RNA or DNA as their genetic material.The nucleic acid may be single-or double-stranded.he T phages of E. coli are large lytic phages that contain a single molecule of double-stranded DNA. This molecule is about 2âÃâ10 5 base pairs long in T2, T4, and T6 viruses and about 4âÃâ10 4 base pairs long in T1, T3, T5, and T7 viruses.
___ Restriction endonucleases cleaves internal phophodiester bonds. 7. Viruses are an example of nucleic acid-protein complexes. Viruses specific for bacteria are called __________, the majority of which have their genetic material in the form of __________. The plant virus TMV carries its genetic material in the form of __________. Human viruses such as HIV and Rous sarcoma virus are called __________ because they require a specific enzyme to decode their RNA genome. 8.