Assignment Review
For the Biology Lab- Cell Structure and Function students will be required to answer many questions and match certain
terms with pictures, determine the movement of water based upon predetermined
factors and draw hypotheses about what may happen in certain situations.
For the the labeling portion of the assignment, students will complete the assignment by matching
vocabulary terms with different pictures as follows:
· Bacteria: Nucleoid region, cell wall, plasma membrane,
ribosomes, flagella
· Protist: Macronucleus, micronucleus, plasma membrane,
cytoplasm, contractile vacuole
· Plant
Cell: Nucleus, cell wall, plasma membrane, cytoplasm, chloroplast,
mitochondria, vacuoles
· Animal
Cell: Nucleus, nucleolus, plasma membrane, cytoplasm, mitochondria, golgi
apparatus, rough ER, ribosome
Then, students will answer nine questions about
basic cell function, including a description of the differences between plant
and animal calls and a hypothesis about what would happen if a chosen structure
of a eukaryotic cell did not function properly.
For the other experiment, students will be presented with
four bags of water with added sucrose in varying percentages. The students will
need to answer questions about what happened when the bags were placed in
beakers of water and draw hypotheses about whether the water will move in or
out.
Discussion
If you are looking for help with the labeling section of the Lab, the bad news is that there really isn’t any. The
best thing you can do here is review labeled photos of the four sections: bacteria,
protist, plant cell and animal cell and study, study, study. There are only
a few things that you’ll need to pick out here, so make sure that you know
where these are located above everything else. You might be surprised to learn
that this will not take you much time. There are also plenty of resources
available online where you can print blank pictures and take ‘practice tests’
on your own time. We have found that this is the absolute best way to prepare
for this assignment.
Testing the concentrations of solutions can be a bit trickier. First and
foremost, you’ll need to make sure that you understand that water always moves from an area of high solute (meaning less water) to an area of low solute
(meaning low water). So, as an example, consider the following four bags:
· Bag
#1 (30%) in 30% sucrose
· Bag
#2 (15%) in 30% sucrose
· Bag
#3 (3%) in 30% sucrose
· Bag
#4 (3%) in 3% sucrose
When placed into their respective beakers, here is
what you can expect:
· The
first bag will experience no change as the sucrose levels are the same.
· The
second bag would shrink since.
· The
third bag would shrink significantly.
· Again,
there would be no change since the concentrations here are equal.
It is also important to note that the concentrations
you are given for your assignment may be different than these. You will also
need to explain why a particular bag increased or decreased in volume the most
and what would happen if a particular bag was placed into a beaker of pure
distilled water.
Should you need further assistance with this lab please ask.
