Download Part E

Name: ___________________________________________
Cells Alive Internet Web Lesson
Objectives: Understand the relative sizes of objects, including the cell, sketch and identify
the function of cell structures; compare eukaryote to prokaryote cells; compare plant and
animals cells.
Part A: You will begin at http://learn.genetics.utah.edu/content/begin/cells/scale/
You will need to use the sliding bar at the bottom of the picture to see all the different
items and their sizes. If the size has two numbers with an X between them it means width
by height.
Object
Measurement
X chromosome
Skin Cell
Sperm
Human Egg
Carbon Atom
Water molecule
Ameoba
tRNA
Coffee bean
Mitochondria
Flu virus
Grain of salt
Measles
Hepatitis
Questions
1. How big are objects that can be seen with the unaided human eye?
______________
2. What size is it impossible to see smaller than? ______________________
3. What are the two types of microscopes?
4. What do sperm cells not contain a lot of? _____________________________
5. What is the size of a carbon atom based on? ___________________________
6. How many chromosomes do humans have? _____________________________
Name: ___________________________________________
Go to www.cellsalive.com
Part B. “How Big”
Here you will look at objects found on the head of a pin. View the objects by
moving the magnification in and out or by clicking on the name of the object on
the right hand side. You will need to answer the following questions and then
estimate the length of each object [nanometers (nm), micrometers (m), or
millimeters (mm)]. The line at the bottom corner of the screen can be used to help
you estimate.
1. What color is the ragweed? __________________
2. Compare each of the following objects on the pin, circle the one that is larger.
a) Baker’s yeast or e. coli
b) Lymphocyte or ragweed
c) Red blood cell or staphylococcus
d) Ragweed or dust mite
3. What units would you use to measure a virus?
4. What units would you use to measure a red blood cell?
Object
Rhinovirus
Dust mite
Staphylococcus
E. coli
Red blood cells
Ebola virus
Human Hair
Measurement (based on the key in the screen
estimate the measurement of each item.)
Name: ___________________________________________
Part C: Bacterial Cell Model - (you will need to return to the "Cell Biology" link to access this
page, or hit your back button)
Part D: Animal Cell Model - (you will need to return to the "Cell Biology" link to
access this page, or hit your back button)
For this model, you will need to click on the various parts of the cell to go to a screen that
tells you about the parts. Answers to the following questions are found there.
1. What do mitochondria do?
Sketch each of the following.
2. How big are mitochondria?
Mitochondria
3. What does the Golgi Apparatus do?
4. What is the difference between smooth
Lysosome
and rough ER?
5. Where is the nucleolus found?
6. What does the nucleolus do?
Golgi Apparatus
7. What does the cytoskeleton do?
8. Cytosol goes by what other name?
9. What is the function of the cytosol?
10. What is the function of the lysosome?
Rough ER
Name: ___________________________________________
Part E: Plant Cell Model - (you will need to return to the "Cell Biology" link to
access this page, or hit your back button)
1. What other type of cell has a cell wall?
Sketch the following
2. What makes the plant cells green?
Chloroplast
3. In plant cells, what does the vacuole do?
Vacuole
Part F. Overview
Use your prior knowledge for the chart below. Place a cheek in the box if the cell
has that component.
Component
Plant
Animal
Bacteria
Chloroplast
Vacuole
Ribosome
Mitochondria
DNA
Endoplasmic Reticulum
Cell Wall
Golgi Body
Part G. Conclusion:
www.beyondbooks.com/lif72/2a.asp
1. What are bacteria?
2. What are the three main shapes of bacteria?
3. How do bacteria reproduce? Describe the process.
4. What are the two kingdoms of bacteria?
IF THERE IS TIME!!!!!
Part H. Quiz - Go to www.cellsalive.com and click on quizzes on the left hand side,
take the microbes quiz and the cell biology quiz.
What was your score on the microbe quiz? ________________________
What was your score on the cell biology quiz? ______________________