14 Jun Biology 124L – Cell Structure and Biological Membranes
Question
Biology 124L Fall 2014
Homework 2: Cell Structure and Biological Membranes
1. Name two components that are present in plant cells but absent in animal cells. What is
the function of each of the components? (1 pt)
2. What cellular structure do cells from an Elodea leaf have that cells from an onion bulb do
not? Why is this the case? (1 pt)
3. Describe what happened to the cells from an Elodea leaf when you added salt water to
them. Why did this happen? (1 pt)
4. Does liquid dye diffuse faster in hot or cold water? Explain why. (1 pt)
5. In the experiment with decalcified eggs, describe what happened to the mass of each egg
over time. Why did the mass of each egg change? Correctly use the following words in
your answer to receive full credit: osmosis, tonicity, hypertonic, hypotonic. (1 pt)
Biology 124L Fall 2014
Homework 2: Cell Structure and Biological Membranes: Answer Sheet
Please type answers in the spaces provided below, print, and turn in at the beginning of lab.
Due Date: The beginning of your scheduled lab during the week of September 8th.
Name: _________________________________________ Section: ____________
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