UMUC Biology 102 / 103 Lab 3: Cell Structure And
Discipline: Biology (and other Life Sciences)
Type of Paper: Creative writing
Academic Level: High school
Paper Format: APA
Question
Function ANSWER KEY
This contains 100%
correct material for UMUC Biology 103 LAB03. However, this is an Answer Key,
which means, you should put it in your own words. Here is a sample for the Pre
lab questions answered:
Pre-Lab Questions
1. Identify the major
similarities and differences between prokaryotic and eukaryotic cells. (2 pts)
Prokaryotes tend to be less complex than
eukaryotic cells, with fewer organelles and (generally) fewer
requirements for survival. Eukaryotes have a nucleus,
while prokaryotes do not. Both eukaryotes and prokaryotes have DNA, a cell
membrane, and cytoplasm.
2. Where is the DNA
housed in a prokaryotic cell? Where is it housed in a eukaryotic cell? (2 pts)
DNA is housed in
the nucleus in eukaryotic cells. Prokaryotic cells do not have
a nucleus, and thus DNA exists freely in the cytoplasm.
3. Identify three
structures which provide support and protection in a eukaryotic cell. (2 pts)
The cell membrane, the
cytoplasm, and the cytoskeleton (microtubules, microfilaments, etc.).
The rest of the
questions are answered as well:
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Experiment 1: Cell Structure and Function
Post-Lab Questions
1. Label
each of the arrows in the following slide image:
2. What
is the difference between the rough and smooth endoplasmic reticulum?
3. Would
an animal cell be able to survive without a mitochondria? Why or why not?
4. What
could you determine about a specimen if you observed a slide image showing the
specimen with a cell wall, but no nucleus or mitochondria?
5. Hypothesize
why parts of a plant, such as the leaves, are green, but other parts, such as
the roots, are not. Use scientific reasoning to support your hypothesis.
Experiment 2: Osmosis
- Direction and Concentration Gradients
Data Tables and
Post-Lab Assessment
Table 3: Sucrose
Concentration vs. Tubing Permeability
Band Color |
Sucrose % |
Initial Volume (mL) |
Final Volume (mL) |
Net Displacement (mL) |
Yellow |
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Red |
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Blue |
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Green |
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Hypothesis:
Post-Lab Questions
1. For
each of the tubing pieces, identify whether the solution inside was hypotonic,
hypertonic, or isotonic in comparison to the beaker solution in which it was
placed.
2. Which
tubing increased the most in volume? Explain why this happened.
3. What
do the results of this experiment this tell you about the relative tonicity
between the contents of the tubing and the solution in the beaker?
4. What
would happen if the tubing with the yellow band was placed in a beaker of
distilled water?
5. How
are excess salts that accumulate in cells transferred to the blood stream so
they can be removed from the body? Be sure to explain how this process works in
terms of tonicity.
6. If
you wanted water to flow out of a tubing piece filled with a 50% solution, what
would the minimum concentration of the beaker solution need to be? Explain your
answer using scientific evidence.
7. How
is this experiment similar to the way a cell membrane works in the body? How is
it different? Be specific with your response.