Exam 11: The Diversity of Bacteria and Archaea

Which of the following microbes is(are) important to cheese-making?

Which organism(s) is/are acid-fast?

Streptomyces

You examine a patient who is complaining of belching (burping), bloating, and some vomiting. She also has some abdominal discomfort which she describes as a dull, burning pain that is worse when she is hungry and is often relieved when she takes antacids. You suspect that she may have Helicobacter pylori gastritis, and send her for a urea breath test. The breath test is positive; based on this, you get the patient's stool tested for blood, and you send her for an endoscopy, during which a biopsy is taken. Your diagnosis is confirmed by the results of these tests and that she does indeed have H. pylori. -The blood in your patient's stool suggests an ulcer. The endoscopy confirms this. You discuss with the patient how H. pylori can cause ulcers. After H. pylori enters your body, it can cause damage to cells in the lining of the stomach, some of which usually produce a protective mucus layer. Once the bacteria have done enough damage, the mucus layer thins and stomach acid can get through the lining, leading to ulcers. You prescribe an antacid medication

The most medically relevant species of Pseudomonas is P. aeruginosa.