Microbiology Exam 2 Review – Step-by-Step Study Guidance

Q1. In your own words, what does “Cell Theory” represent?

Background

Topic: Cell Theory

This question tests your understanding of one of the foundational principles of biology, which describes the properties and significance of cells in living organisms.

Key Terms:

• Cell Theory

• Cells

• Organisms

Step-by-Step Guidance

1. Recall the three main tenets of cell theory as discussed in class.

2. Think about how these tenets apply to all living things, including both unicellular and multicellular organisms.

3. Consider how you would explain the importance of cells to someone unfamiliar with biology.

4. Try to summarize the concept in your own words, focusing on the role of cells in structure and function.

Try solving on your own before revealing the answer!

Final Answer:

Cell Theory states that all living things are made up of cells, that the cell is the basic unit of structure and function in living organisms, and that all cells come from pre-existing cells. This means that cells are the fundamental building blocks of life, and all life processes occur within them.

Q2. Name the types of Microscopes described in class.

Background

Topic: Microscopy

This question assesses your knowledge of the different types of microscopes used in microbiology and their applications.

Key Terms:

• Compound Light Microscope

• Scanning Electron Microscope (SEM)

• Transmission Electron Microscope (TEM)

• Resolution

Step-by-Step Guidance

1. List the main types of microscopes discussed in your lectures.

2. Recall the differences in how each microscope works (e.g., light vs. electron microscopy).

3. Think about the resolution limits and what types of specimens each microscope is best suited for.

Try solving on your own before revealing the answer!

Final Answer:

The main types of microscopes described in class are the Compound Light Microscope, Scanning Electron Microscope (SEM), and Transmission Electron Microscope (TEM). Each has different resolution limits and is used for observing different types of specimens.

Q3. If you were working as a scientist in a lab, and they gave you the samples below, which microscope could you use to observe: 1. An Amoeba? 2. Your Blood cells? 3. The Flu Virus? 4. An Amino Acid? 5. Your DNA?

Background

Topic: Application of Microscopy

This question tests your ability to match biological samples with the appropriate microscope based on size and resolution.

Key Terms:

• Resolution

• Compound Microscope

• Scanning Electron Microscope (SEM)

• Transmission Electron Microscope (TEM)

Step-by-Step Guidance

1. Recall the approximate size of each sample (e.g., amoeba, blood cell, virus, amino acid, DNA).

2. Match the sample size to the resolution capability of each microscope type.

3. Assign the most appropriate microscope for each sample based on what you learned in class.

4. Double-check your choices by considering whether the sample is visible with light or requires electron microscopy.

Try solving on your own before revealing the answer!

Final Answer:

• Amoeba: Compound Microscope

• Blood cells: Compound Microscope

• Flu Virus: Transmission Electron Microscope

• Amino Acid: Transmission Electron Microscope

• DNA: Transmission Electron Microscope

Electron microscopes are needed for structures smaller than the resolution limit of light microscopes.

Q4. You go out into the field, and you are told to collect one kind [sample] of each Eukaryote: What would you collect under each one?

Background

Topic: Classification of Eukaryotes

This question tests your understanding of the major groups of eukaryotic organisms and your ability to identify examples from each group.

Key Terms:

• Eukaryote

• Kingdoms: Animalia, Plantae, Fungi, Protista

Step-by-Step Guidance

1. Recall the main groups of eukaryotes discussed in class.

2. Think of a representative organism you could collect from each group (e.g., animal, plant, fungus, protist).

3. Consider the environments where you might find each type of eukaryote.

4. List one example for each group.

Try solving on your own before revealing the answer!

Final Answer:

• Animalia: Insect or worm

• Plantae: Leaf from a tree or grass

• Fungi: Mushroom or mold

• Protista: Pond water sample containing algae or protozoa

Each group represents a major branch of eukaryotic life.

Q5. How could you tell between the cell of a mushroom and that one of an orange leaf?

Background

Topic: Cell Structure and Classification

This question tests your ability to distinguish between fungal and plant cells based on their structural features.

Key Terms:

• Cell wall composition

• Chloroplasts

• Vacuole

Step-by-Step Guidance

1. Recall the main differences between plant and fungal cells (e.g., cell wall composition, presence of chloroplasts).

2. Think about which organelles are present in each cell type.

3. Consider the function and appearance of each cell type under a microscope.

4. List the distinguishing features you would look for to tell them apart.

Try solving on your own before revealing the answer!

Final Answer:

Plant cells (like those in an orange leaf) have cell walls made of cellulose and contain chloroplasts for photosynthesis. Fungal cells (like those in a mushroom) have cell walls made of chitin and lack chloroplasts. These differences help distinguish between the two cell types.