Question

9/80 9. You are viewing multiple slides using the microscope. After focusing and viewing one slide, should you have to refocus your microscope when changing to another slide? Explain your answer 10. You are examining a urine sample from an individual with a suspected infection. You were unable to detect any microbes until you viewed the sample at 1000X TM. To which domain of life does the disease-causing microbe belong? Explain the reason for your answer rinary tract
Help with 9 and 10

Answer 1

9)Yes we need to refocus while changing from one slide to another.While focusing one slide under the microscope ; we focus on specific features of that slide.On changing the slide the features we want to see may not be present at the same position on that slide.We need to adjust the fine adjustment to focus on the desirable features of that slide.

10)1000X is generally used for bacteria .The smallest sized object that unaided eye can see is 200 micrometre.So 1000X means an object of a size of (200/1000) 0.2 micrometer can be seen under the microscope.Most bacteria fall into this size range.Some bacteria like rickettsia are smaller than this and all viruses are smaller than this (viruses have size in nanometers).So they cant be seen.So organisms belonging to bacteria domain of life can be viewed.