Cell Discovery Guide Worksheet Cell Discovery Guide
Unit 7A: Foundations of Biology
Name:
Date:
The Microscopic Pioneers
Identify the contributions of these two key scientists in the history of cell biology.
Robert Hooke
What did he observe? What term did he coin?
Anton van Leeuwenhoek
What did he call the "tiny creatures" he saw?
The Three Pillars of Cell Theory
The Cell Theory is a fundamental concept in biology. Fill in the three main tenets below.
1
2
3
Discussion Reflection
Why was the invention of the microscope necessary for the development of the Cell Theory? How did technology influence scientific understanding?
Cell Foundations Slides Tiny Beginnings
The Discovery of the Cell & The Foundations of Biology
Unit 7A: Microscopes & Discovery
The Invisible World
Imagine...
Before the late 1600s, humans had no idea that everything was made of tiny, microscopic building blocks.
The Question
What are living things actually made of when you look past what our eyes can see?
Robert Hooke (1665)
The Namer
Observed thin slices of cork under a crude microscope.
He saw thousands of tiny, empty "boxes" or chambers.
He called them "CELLS" because they reminded him of the small rooms in a monastery.
"I could exceedingly plainly perceive it to be all perforated and porous, much like a Honey-comb..."
Historical Illustration of Cork Cells
Anton van Leeuwenhoek
The Observer
Pond Water Discovery
Leeuwenhoek used a hand-crafted microscope to look at drops of pond water, teeth scrapings, and even his own blood.
"Animalcules"
He called these tiny, moving creatures "little animals."
First to see living organisms.
Discovered bacteria and protists!
The Three Tenets
1
All living things are made of cells.
2
Cells are the basic unit of life.
3
All cells come from pre-existing cells.
"Omnis cellula e cellula" - Every cell from a cell.
Microscope Mastery Slides Lens Power
Mastering the Compound Light Microscope
Unit 7A: Technical Mastery
The Compound Principle
Why "Compound"?
It uses two or more lenses at the same time to magnify an object.
How Light Helps
Light passes through the specimen, which is why it must be very thin!
No Light = No Sight
The diaphragm controls how much light hits the slide.
Microscope Math
Eyepiece
10x
Objective
40x
Total
400x
Formula: Eyepiece × Objective = Total Power
Safety & Handling
The Carry
Always use TWO HANDS :
One hand on the ARM
One hand under the BASE
Lens Care
Only use LENS PAPER to clean lenses.
Paper towels or shirts will scratch the delicate glass!
The Golden Rules of Focusing
Start on Low Power objective (scanning lens).
Use Coarse Adjustment ONLY on low power.
Use Fine Adjustment for medium and high power.
DANGER
Never use the coarse adjustment knob on high power – it can crush the slide!
Microscope Map Worksheet Microscope Mastery
Mapping the Lens to the Specimen
Name:
Date:
Part 1: Anatomy of a Microscope
Match the following parts to their function using the word bank provided.
Eyepiece Objective Lens Stage Diaphragm Coarse Adjustment Fine Adjustment Base Arm
Lenses you look through:
The platform where slides sit:
Controls amount of light:
Large knob for initial focus:
Small knob for crisp detail:
Part 2: Calculating Magnification
Calculate the total magnification for each lens combination. Formula: Eyepiece × Objective = Total Magnification
Eyepiece Objective Total Magnification 10x × 4x (Scanning) = 10x × 10x (Low) = 10x × 40x (High) =
Part 3: The Lab Safety Protocol
How do you hold it?
Why NO coarse knob on high?
Microscope Mystery Lab Worksheet Microscope Mystery
Investigation: The Secret of the 'e'
Name:
Date:
Background
When we look through a compound light microscope, the lenses don't just make things bigger—they change how we see them. Today, you will use a simple "e" to discover the secret of microscopic vision.
Part 1: Procedure
Cut out a small lowercase "e" from a newspaper or printed sheet.
Place it on a clean slide so it is right-side up.
Add one drop of water and cover with a coverslip (this is a wet mount ).
Place the slide on the stage and secure with clips.
Start on Low Power (4x) and focus using the coarse adjustment knob.
Part 2: Observations
The "e" with naked eye
Draw it exactly as it sits on the slide.
The "e" at 40x Total Power
Draw exactly what you see through the lens.
1. Inversion Check:
Compare your two drawings. What happened to the "e"? (Is it upside down? Backwards?)
2. The Movement Test:
While looking through the lens, move the slide to the RIGHT . Which way did the "e" appear to move?
High Power Challenge
Switch to High Power (400x). Use ONLY the fine adjustment knob . Describe the texture of the ink on the paper. Is it a solid line or dots?
Protist Pioneers Slides Protist Pioneers
The Amoeba & The Paramecium
Unit 7B: Unicellular Organisms
The Shape-Shifter: Amoeba
Heterotroph
Pseudopods
"False feet." They stretch their cell membrane to move and capture food .
Food Vacuole
A temporary "stomach" that digests the food captured by pseudopods.
Movement by Oozing
The Cilia Swimmer: Paramecium
The Most Complex
Cilia
Hair-like structures used for rapid movement and sweeping food.
Oral Groove
An indentation where food is swept into the cell.
Anal Pore
Where waste is removed from the cell.
"Slipper-Shaped"
The Survival Tool Kit
Contractile Vacuole
The "Pump." It collects and removes excess water so the cell doesn't explode!
Found in BOTH Amoeba and Paramecia.
Cell Membrane
The "Gatekeeper." It controls what enters and leaves the cell.
Found in ALL protists.
Protist Blueprints Part 1 Worksheet Protist Blueprints
Part 1: The Shape-Shifters & Cilia Swimmers
Name:
Class:
The Amoeba
Amoeba proteus
Label the structures:
(False foot for movement)
(Removes excess water)
(Controls cell activity)
(Stores/digests food)
The Paramecium
Paramecium caudatum
Label the structures:
(Tiny hairs for swimming)
(Funnel for food entry)
(Point for waste removal)
(Pumps out excess water)
Survival Strategy
According to the lesson, the paramecium is considered the "most complex" of the four protists we study. Based on the structures you labeled, why do you think this is true?
Pond Water Safari Lab Worksheet Pond Water Safari
Investigation: Tracking the Big Four Protists
Name:
Partner:
Your Mission
Observe live samples of pond water or prepared cultures. Use your microscope skills to identify, track, and sketch the unique structures of the Amoeba, Paramecium, Euglena, and Volvox .
Specimen 1: The Fast & The Oozing
Target: Paramecium or Amoeba
Identification Notes
Movement Strategy:
(Cilia, Pseudopod, or Flagella?)
Visible Structures:
(Nucleus? Vacuole? Oral Groove?)
Specimen 2: The Green Machines
Target: Euglena or Volvox
Identification Notes
Color Observation:
(Why are they this color?)
Special Features:
(Eyespot? Daughter Colonies?)
Post-Safari Analysis
Of all the organisms you observed, which one had the most effective way of moving? Explain why using evidence from your observations.
Green Machine Slides Green Machines
The Euglena & The Volvox
Unit 7B: Autotrophs & Colonies
The Versatile Euglena
Autotroph & Heterotroph
Eyespot
A light-sensitive organelle that detects sunlight .
Chloroplasts
Used to make food through photosynthesis .
Flagellum
A whip-like tail used to pull the cell through water.
Dual Life: Moves like an animal, eats like a plant!
The Colonial Volvox
Autotroph
A colony of thousands of individual cells working together.
Each cell has two flagella to coordinate swimming.
Contains smaller daughter colonies inside.
How do they get energy?
Autotrophs
Make their own food using sunlight (Photosynthesis).
Volvox Euglena
Heterotrophs
Must consume other organisms for food.
Amoeba Paramecium Euglena*
*Euglena can do BOTH!
Protist Blueprints Part 2 Worksheet Protist Blueprints
Part 2: The Solar Seekers & Colonial Orbs
Name:
Date:
The Euglena
Identify the organelle:
(Light-sensing organ)
(Whip-like tail)
(Site of photosynthesis)
The Volvox
Identify the feature:
(Tiny "baby" orbs inside)
(Number of flagella per cell)
Energy Classification
Autotrophs
Heterotrophs
*Note: One organism fits in both categories!
Hidden Worlds Assessment Unit 7B Assessment
Unicellular Organisms & Life Functions
Name:
Date:
Part 1: Identifying Protists
1. Which of the following characteristics do Volvox and Euglena share?
A. They both use cilia to move. B. They both use flagella to move. C. They both use pseudopods to capture food. D. They are both classified as strictly heterotrophs.
2. Which organism is known for using "false feet" or pseudopods for movement and feeding?
A. Paramecium B. Euglena C. Amoeba D. Volvox
3. Why is the Paramecium considered the most complex of these four unicellular organisms?
A. It has an eyespot to detect light. B. It lives in a colony with thousands of other cells. C. It has an oral groove, anal pore, and food vacuoles. D. It can make its own food through photosynthesis.
Part 2: Structure & Function
Identify the correct organelle for each life function listed below.
4. Water Regulation
Pumps out excess water so the cell does not burst.
5. Energy Production (Autotrophs)
Captures sunlight to make glucose (food).
6. Light Detection
Allows the organism to find the best area for photosynthesis.
7. Control Center
Contains DNA and directs all cell activities.
Part 3: Scientific Explanation
8. Construct an explanation: How does a colony of Volvox cells carry out life functions differently than a single Amoeba cell?
Hidden Worlds Answer Key Teacher Answer Key
Unit 7B: Unicellular Organisms Assessment
For Teacher Use Only
Part 1: Identifying Protists
B. They both use flagella to move.
C. Amoeba
C. It has an oral groove, anal pore, and food vacuoles.
Part 2: Structure & Function
Contractile Vacuole
Chloroplast
Eyespot
Nucleus
Part 3: Scientific Explanation (Sample Response)
8. Volvox vs. Amoeba
"The Volvox carries out life functions as a colony, meaning thousands of cells work together to move (coordinating their flagella) and survive, whereas an Amoeba is a single cell that functions entirely on its own. While both are autotrophs (Volvox) or heterotrophs (Amoeba), the Volvox relies on group coordination for complex movement, while the Amoeba uses its own pseudopods to navigate and eat."
Grading Criteria:
Mentions Volvox as a "colony" or group of cells.
Mentions Amoeba as a "single" or individual cell.
Correctly identifies flagella (Volvox) vs pseudopods (Amoeba).
Explains the coordination of life functions in the colony.
