“Lab 3 Structure & Microscopy BIO250L”
Student Name: Natali Sargsyan
Access Code (located on the lid of your lab kit): AC-1FZTUB
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected.
Pre-lab Questions
1. In this lab, you will conduct three experiments. What is the ultimate goal of those experiments
in the context of this lab? What learning outcomes do you think this lab is attempting to convey
with them?
The primary objective of the experiments in the "Structure and Microscopy" lab is to educate
students on the process of preparing and analyzing biological samples using microscopes,
thereby improving their proficiency in microscopy techniques. The lab aims to achieve several
learning outcomes, such as mastery in sample preparation, operational competence in
microscopy, and the capability to recognize and explain cellular and tissue structures. These
outcomes aim to solidify students' foundational understanding in the realm of structural
biology.
2. Explain the purpose of staining in the context of microbiology. Why do we utilize various
staining techniques?
In microbiology, staining serves to improve the visibility and contrast of cellular and tissue
structures when viewed under a microscope. A range of staining techniques is applied to
differentiate various components within samples, facilitating the examination of cellular
morphology, identification of particular structures, and disease diagnosis..
3. Each experiment in this lab will cover a different staining technique. List those techniques below
and provide a brief explanation of when each of those techniques would be used.
○ Hematoxylin and Eosin (H&E) Staining
○ Periodic Acid-Schiff (PAS) Staining
○ Immunofluorescence Staining
This study source was downloaded by 1143875 from cliffsnotes.com on 08-10-2025 18:55:56 GMT -05:00
https://www.cliffsnotes.com//study-notes/7777925
, “Lab 3 Structure & Microscopy BIO250L”
EXPERIMENT 1: SIMPLE STAINING
Introductory Questions
1. What is the objective of Experiment 1?
Experiment 1 aims to introduce and illustrate the method of basic staining in microbiology.
2. What is the purpose of Step 8 under Smear the Slide in this experiment?
Step 8, which involves air-drying the slide, aims to ensure that the bacterial smear is fully dried
before proceeding to staining. This step guarantees that the sample is effectively fixed onto the
slide and prepared for the staining procedure.
3. Give an example of a situation in a lab or medical setting in which simple staining would be
utilized.
Simple staining could be employed in a medical environment to promptly distinguish and classify
bacterial species found in a patient's clinical specimen, aiding in determining appropriate
treatment strategies for bacterial infections.
Data and Observations
Report your observations from your staining in the table below. Ensure that you provide details that
were revealed by the staining technique. If you do not have a microscope available, utilize Figure 10 as
an example.
Table 1: Simple Staining Observations
Stain Used: Crystal Violet
The staining with Crystal Violet revealed that the organisms present
exhibited a deep purple coloration. Under the microscope, the cells
Observations: appeared spherical in shape with a uniform size. They were arranged singly
and in clusters, indicating both individual cells and colonies within the
sample.
This study source was downloaded by 1143875 from cliffsnotes.com on 08-10-2025 18:55:56 GMT -05:00
https://www.cliffsnotes.com//study-notes/7777925
Student Name: Natali Sargsyan
Access Code (located on the lid of your lab kit): AC-1FZTUB
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected.
Pre-lab Questions
1. In this lab, you will conduct three experiments. What is the ultimate goal of those experiments
in the context of this lab? What learning outcomes do you think this lab is attempting to convey
with them?
The primary objective of the experiments in the "Structure and Microscopy" lab is to educate
students on the process of preparing and analyzing biological samples using microscopes,
thereby improving their proficiency in microscopy techniques. The lab aims to achieve several
learning outcomes, such as mastery in sample preparation, operational competence in
microscopy, and the capability to recognize and explain cellular and tissue structures. These
outcomes aim to solidify students' foundational understanding in the realm of structural
biology.
2. Explain the purpose of staining in the context of microbiology. Why do we utilize various
staining techniques?
In microbiology, staining serves to improve the visibility and contrast of cellular and tissue
structures when viewed under a microscope. A range of staining techniques is applied to
differentiate various components within samples, facilitating the examination of cellular
morphology, identification of particular structures, and disease diagnosis..
3. Each experiment in this lab will cover a different staining technique. List those techniques below
and provide a brief explanation of when each of those techniques would be used.
○ Hematoxylin and Eosin (H&E) Staining
○ Periodic Acid-Schiff (PAS) Staining
○ Immunofluorescence Staining
This study source was downloaded by 1143875 from cliffsnotes.com on 08-10-2025 18:55:56 GMT -05:00
https://www.cliffsnotes.com//study-notes/7777925
, “Lab 3 Structure & Microscopy BIO250L”
EXPERIMENT 1: SIMPLE STAINING
Introductory Questions
1. What is the objective of Experiment 1?
Experiment 1 aims to introduce and illustrate the method of basic staining in microbiology.
2. What is the purpose of Step 8 under Smear the Slide in this experiment?
Step 8, which involves air-drying the slide, aims to ensure that the bacterial smear is fully dried
before proceeding to staining. This step guarantees that the sample is effectively fixed onto the
slide and prepared for the staining procedure.
3. Give an example of a situation in a lab or medical setting in which simple staining would be
utilized.
Simple staining could be employed in a medical environment to promptly distinguish and classify
bacterial species found in a patient's clinical specimen, aiding in determining appropriate
treatment strategies for bacterial infections.
Data and Observations
Report your observations from your staining in the table below. Ensure that you provide details that
were revealed by the staining technique. If you do not have a microscope available, utilize Figure 10 as
an example.
Table 1: Simple Staining Observations
Stain Used: Crystal Violet
The staining with Crystal Violet revealed that the organisms present
exhibited a deep purple coloration. Under the microscope, the cells
Observations: appeared spherical in shape with a uniform size. They were arranged singly
and in clusters, indicating both individual cells and colonies within the
sample.
This study source was downloaded by 1143875 from cliffsnotes.com on 08-10-2025 18:55:56 GMT -05:00
https://www.cliffsnotes.com//study-notes/7777925
