Goel, Mehul Cells Alive - Cells Alive-Internet Lesson Mehul Goel ... - Free Printable

Problem Analysis and Solution

The provided document is a worksheet titled "Cells Alive-Internet Lesson". It consists of three main parts: Part A, Part B, and Part C. Each part focuses on different aspects of cellular biology, including size comparisons, prokaryotic cell models, and animal cell models. Below is a detailed explanation and solution for each part.

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#### Part A: "How Big is A…?"
- Objective: Compare the sizes of various objects (cells, viruses, etc.) and rank them from smallest to largest.
- Instructions:
1. Navigate to the website [www.cellsalive.com](http://www.cellsalive.com).
2. Use the navigation bar to access the "HOW BIG" section.
3. Compare the sizes of objects shown on the head of a pin using the line in the bottom right corner as a reference.
4. Fill in the table with the sizes and ranks.

- Table Provided:
| Cell Type | Size (with units!) | Rank (smallest to largest) |
|--------------------|--------------------|-----------------------------|
| Human Hair | 11 millimeters | Rhinovirus |
| Dust Mite | 400 micrometers | Ebola virus |
| Red Blood Cell | 10 micrometers | Staphylococcus |
| E. Coli | 2 micrometers | E. Coli |
| Staphylococcus | 0.35 micrometers | Red Blood Cells |
| Ebola virus | 1200 nanometers | Dust Mite |
| Rhinovirus | 30 nanometers | Human Hair |

- Explanation:
- The sizes are already filled in the table.
- The ranking is based on the size of each object, from smallest to largest.
- For example:
- Rhinovirus (30 nanometers) is the smallest.
- Human Hair (11 millimeters) is the largest.

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#### Part B: Prokaryotic Cell Model
- Objective: Understand and label the components of a bacterial cell model.
- Instructions:
1. Click on "Cell Models."
2. Select "Bacterial Cell Model."
3. Sketch and label the following organelles:
- DNA
- Ribosomes
- Cell membrane
- Cell wall
4. Answer questions about specific parts of the bacterial cell.

- Diagram Provided:
- Labeled parts include:
- Pilus
- Capsule
- Cell wall
- Plasma membrane
- Nucleoid (DNA)
- Cytoplasm
- Ribosomes
- Flagellum

- Questions and Answers:
1. What is in the nucleoid region?
- Answer: The nucleoid region contains bacterial DNA. Additionally, RNA and proteins can also be found within this region.
2. What is a pilus (plural: pili)?
- Answer: Pili are hollow, hair-like structures made of proteins that allow bacteria to attach to other cells. These structures are also referred to as fimbriae.

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#### Part C: Animal Cell Model
- Objective: Explore and understand the components of an animal cell model.
- Instructions:
1. Return to the home page and click on "Cell Models."
2. Select "Animal and Plant Cell Animation."
3. Click on the appropriate organelle to answer questions about its function.

- Explanation:
- This part requires interactive exploration of the website to identify and learn about the functions of different organelles in an animal cell.
- Examples of organelles in an animal cell include:
- Nucleus
- Mitochondria
- Endoplasmic Reticulum
- Golgi Apparatus
- Lysosomes
- Ribosomes
- Centrioles

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Final Answer Summary

1. Part A:
- Sizes and rankings are already provided in the table.
- Smallest: Rhinovirus (30 nanometers)
- Largest: Human Hair (11 millimeters)

2. Part B:
- Nucleoid Region: Contains bacterial DNA, RNA, and proteins.
- Pili: Hollow, hair-like structures made of proteins that allow bacteria to attach to other cells.

3. Part C:
- Requires interactive exploration of the website to identify and learn about animal cell organelles.

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Final Answer Box:

\[
\boxed{
\text{See explanations above for detailed solutions.}
}
\]