BIOD 171 Essential Microbiology Portage Learning Module L2: Lab Exam 2

This guide provides insights into the BIOD 171 MICROBIOLOGY LAB 2 LATEST EXAM 2025. It is essential to understand the core components of the BIOD 171 Essential Microbiology Portage Learning curriculum, specifically focusing on the Lab Reports of Microbiology and the BIOD 171 L2: Lab Exam 2 requirements.

Microscope Part Identification

One of the primary tasks in the exam is to identify the part of the microscope indicated by the arrow. According to the Lab Reports Microbiology, the following parts are critical for identification:

• Oculars/eyepiece
• Objective lens
• Fine Focus

Visualization and Pointer Usage

A common scenario encountered in the lab is as follows: while viewing a sample under a microscope you find something interesting within your field of view. How would you best indicate your region of interest to a friend when viewing your sample?

The study materials explain that some microscopes, within the eyepiece, have a pointer that points to the center of an object using a single line. Therefore, you would utilize the pointer—a line controlled by spinning the ocular—to point directly to your region of interest. Effectively, you can point to the sample (control the pointer) by adjusting the eyepiece (rotating the oculars).

Magnification and Sample Sizing

Understanding magnification calculations is vital for the BIOD 171 Essential Microbiology Portage Learning Module L2: Lab Exam 2. Consider this example: you are viewing a sample of bacteria that is 3 μm in diameter through a 40x objective lens. The eyepiece has a magnification power of 10x.

When asked, what size will the sample appear through the eyepiece?, the calculation results in the sample appearing 1200 μm in diameter (or 400x’s larger).

Oil Immersion Protocol

Based on the microscope shown in the lab lecture, which objectives would require placing oil on the slide in order to clearly visualize the sample? To ensure success in the BIOD 171 L2: Lab Exam 2, students must know that this requires the 100x objective lens.

Summary of Lab Exam Data

• Microscope Components: Oculars, Objective lens, Fine Focus
• Magnification Factor: 40x objective * 10x eyepiece = 400x total magnification
• Resultant Sample Size: 3 μm * 400 = 1200 μm in diameter
• Oil Immersion Requirement: 100x magnification