Name ______________________________________ Class ____________ Date _______________
Cells and DNA
Please follow this page, clicking on the blue/purple underlined websites. Some of the
answers will appear on the web page. Some answers you will need to figure out.
FOLLOW ANY DIRECTIONS GIVEN ON THIS LAB SHEET. You do not have permission
to visit other web sites during this lab. NO MUSIC! No Food. This is your Warning.
1. Click: http://www.usoe.k12.ut.us/curr/science/sciber00/7th/cells/sciber/celldiag.htm
Use the link to help you label all the arrows for the two cells below.
2. Click: http://www.usoe.k12.ut.us/curr/science/sciber00/7th/cells/sciber/cellcomp.htm
Use the clues on this page and determine which of the cells above is the animal cell and which is a plant
cell. Write the names on the lines to the right of each cell.
3. Click: http://www.usoe.k12.ut.us/curr/science/sciber00/7th/cells/sciber/celldiag.htm
Use the link and list a function for each of the organelles and cell structures below:
Cell membrane-_______________________________________________________________________
____________________________________________________________________________________
Vacuole-____________________________________________________________________________
____________________________________________________________________________________
Mitochondrion_______________________________________________________________________
____________________________________________________________________________________
Cytoplasm___________________________________________________________________________
____________________________________________________________________________________
Cell wall_____________________________________________________________________________
____________________________________________________________________________________
Nucleus_____________________________________________________________________________
____________________________________________________________________________________
Lysosome____________________________________________________________________________
____________________________________________________________________________________
Chloroplast___________________________________________________________________________
____________________________________________________________________________________
4. Click: http://www.exploratorium.edu/traits/cell_explorer.html
Find the following organelles on the cell with this link and describe their function.
Endoplasmic reticulum________________________________________________________________
____________________________________________________________________________________
Golgi apparatus _____________________________________________________________________
____________________________________________________________________________________
Centrosomes _______________________________________________________________________
____________________________________________________________________________________
5. Click:
http://www.classzone.com/books/ml_science_share/vis_sim/dltm05_pg39_photosyn/dltm05_pg39
_photosyn.html
Lets take a look at cell during photosynthesis! You remember that the ingredients for photosynthesis are
____________________________________(hint: CO2) and _______________________(hint: H2O).
Follow the screen and figure where in a plant cell (what organelle) photosynthesis takes place:
___________________________________. Summarize briefly what happens next!
_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
6. Click: http://www.cellsalive.com/myocyte.htm
We know the heart as an important organ in our circulatory system that acts as a pump to move blood
through our body. We may not immediately think of our heart as
a_____________________________________________________. But it is the complex interaction of
numerous cell types that give the heart its ability to pump blood. Scientists can actually separate the
individual cells. Observe the picture and describe what you see:________________________
__________________________________________________________________________________
What is a single heart cell called? ________________________________
Scroll down a bit and answer this: If heart cells have their own beat, how can the heart beat all together, as
one pump?
_____________________________________________________________________________________
7. Click: http://www.biology4kids.com/files/cell_main.html
All living organisms on Earth are divided in pieces called _______________________. There are smaller
pieces to cells that include proteins and ____________________. There are also larger pieces called
_________________________ and _________________________. Cells are small compartments that
hold all of the biological equipment necessary to keep an organism
____________________________________________________ on Earth.
8. Click: http://www.biology4kids.com/files/cell_nucleus.html
The cell nucleus acts like the __________________ of the cell. It helps control eating, movement, and
__________________________________. The nucleus is not always in the center of the cell. It will be a
big dark spot somewhere in the middle of all of the _______________________________. You probably
won't find it near the edge of a cell because that might be a dangerous place for the nucleus to be. If you
don't remember, the cytoplasm is the _________________________________________.
Label the following structures found in the nucleus and describe
their function:
PoreNucleolus
Chromatin
Envelope-
When the cell is in a resting state there is something called _______________________ in the nucleus.
When the cell is going to ____________________________, the chromatin becomes very compact. It
condenses. When the chromatin comes together, you can see the _________________________. You will
also find the nucleolus inside of the nucleus. When you look through a microscope, it looks like a
_______________________________________. It is made of
__________________________________________. It does not have much DNA at all.
9. Click: http://www.biology4kids.com/files/cell_chromosome.html
Chromosomes are the things that ______________________________________. They carry all
of the information used to help a cell _______________________________________________.
Chromosomes are made up of _______________________. Segments of DNA in specific
patterns are called ________________________. Your genes make you who you are.
Chromosomes are not always visible. They usually sit around uncoiled and as loose strands called
_____________________________. When it is time for the cell to________________________,
they condense and wrap up very tightly. The tightly wound DNA
___________________________________________.
Scientists count individual strands of chromosomes. You probably have
________________________ (23 pairs). Peas only have_________. A dog has ____________.
The number of chromosomes is NOT related to the intelligence or complexity of the creature.
There is a crayfish with __________________________.
Click: http://www.cs.brown.edu/stc/outrea/greenhouse/nursery/biology/gfx/plantcell.avi
Take a quick flight through a cell. What is the big brown thing? _________________________ Inside the
big brown thing there is a smaller brown thing. What is that? ____________________________ What do
you think the red things might be? _____________________________ Do you think this is a plant or
animal cell? ______________________________ Explain your answer: _______________________
________________________________________________________________________________
http://www.cellsalive.com/myocyte.htm
http://www.classzone.com/books/ml_science_share/vis_sim/dltm05_pg39_photosyn/dltm05_pg39_photos
yn.html
http://www.classzone.com/books/ml_science_share/vis_sim/chm05_pg19_microscope/chm05_pg19_micr
oscope.html
http://www.cs.brown.edu/stc/outrea/greenhouse/nursery/biology/gfx/plantcell.avi