Biology 156: Lab Practical 3 exam | Questions and Verified Solutions 2024/2025

Biology 156: Lab Practical 3 exam | Questions and Verified Solutions 2024/2025 2 domains that contain prokaryotes - Answer - Bacteria and Archaea 2 benefits of bacteria - Answer - 1. some bacteria are decomposers, which break down organic material (e.g. sewage treatment), 2. many bacteria in the human body help facilitate functions which aid in digestion Human diseases caused by bacteria - Answer - pneumonia, tuberculosis, gonorrhea, syphilis, chlamydia, cholera, tetnus, botulism, bubonic plague, lyme disease What is the purpose of fixing the smear? - Answer - The purpose of fixing a smear is to make cells stick to the slide, kill bacteria in the smear, and allow for optimal capability for retaining any stains performed 2 methods of fixing the smear - Answer - heat fixation and chemical fixationHeat fixation - Answer - kills the cells, destroying autolytic enzymes, and causes the cells to adhere to the slide chemical fixation - Answer - In microscopy, a technique that uses methyl alcohol or formalin to attach a smear to a slide. advantage of viewing an unstained s