Read all parts of each of the questions carefully . The correct answer is relevant to the question, true in all its parts, and best answers the question. At the end, turn in only the answer sheet - you may keep the questions sheet for future reference. Please return any pencils you have borrowed. There are 17 questions.
Viruses contain a piece of nucleic acid.
Bacterial diseases are usually caused by toxins. This sequence is present in the middle of a piece of DNA which is originally 1000 base pairs long. Dr. Zaner spoke about the case of a young pregnant woman who suspected that members of her husband's family had died of Huntington's disease, and that her husband might carry the allele for Huntington's disease. Consider the following gels, which show DNA from three different people cut with the restriction enzyme MstII, separated by gel electrophoresis, and stained for the hemoglobin gene. The mutation of the hemoglobin gene which leads to sickling of red blood cells causes the hemoglobin gene to be cut into a piece which is 1350 base pairs long, while the normal hemoglobin gene is cut by MstII into a piece which is 1150 base pairs long.