Lab #2 Data

Hi all,

I'm going to post a series of links containing your raw data from Lab #2.  A few important points:

1) The data appears as a columns of numbers, unlabeled.  Your first run is on the left hand column; your second run will be next to it; and so on.  You will need to label each run.

2) The data as it appears is NOT in an acceptable format for the lab write-up.  You must add table headers and borders so that the data table conforms to conventions in the student handbook.

3) The graph did not export.  You must choose an appropriate way to process and graph the data, drawing on your experiences in the post-lab discussion and the following days (for example, we calculated the rate and discussed several ways of graphing in class when we used the simulation).  You should be able to explain why you made the graph choices you did.

A good rule of thumb is that your presented data should answer the question you are investigating.  I should be able to look at your graph and see the answer to the question "how does temperature affect the rate of an enzyme controlled reaction?"

Labs are due next Wednesday.

Your files are posted below.  [UPDATE: TO DOWNLOAD THE FILE, YOU MUST LEFT CLICK AND CHOOSE "SAVE LINK AS," AND SAVE THE FILE TO YOUR COMPUTER.  IT WILL BE A .CSV FILE, WHICH YOU CAN OPEN AND VIEW IN EXCEL.  THANKS]

Amanda Jose James
Adrian Ryan Jafar
Shaq Ryuichi Kenny
Zehra Spencer Kai Ni
Amir Brian Pedro
Romi Jerry Arisbeth
Harry Genesis Kazi
Mridul Tyson Billy
Javier Anabel Lillian
Jennifer Ehis Lourdes
Victoria Megan Shanique
Lawrence Brittany Ian Giselle

See me with questions.

Enzymes: Life's little helpers

Hi all,

Today we learned about enzymes, the biological catalysts that speed up chemical reactions in the cell.

Check out these animations and videos which offer tutorials about the basic properties of enzymes.  They may be useful as you answer your pre-lab questions for Monday.

How Enzymes Work
Enzyme Action and the Hydrolysis of Sucrase

Homework
R6: Please complete your pre-lab questions for Monday.

R4: There will be a quiz on 6.1.1, 6.1.2, 6.1.4, and 6.1.5 on Monday.  Please note that for the digestive system (6.1.4), you should be able to clearly draw and label the following parts: mouth, esophagus, stomach, small intestine, gall bladder, pancreas, liver, large intestine, anus.  Make sure you can clearly show how the accessory organs (gall bladder, pancreas, liver) are connected to the small intestine.  You can also begin your Unit 2 assessment statements for these numbers, because believe it or not, there are only two weeks left in the term and another unit test is looming!

Thanks,
Mr. Hill

Thanks,
Mr. Hill

Duh-gestion

Today, we built a working classroom model of the human digestive system, and observed how large food particles can be physically and chemically digested into molecules that are small enough to be transported into the cell.  This is just the tip of the iceberg of our second unit, about the "stuff of life" - the matter, molecules, and atoms that all living things are made of.

Homework
Your osmosis lab report is due Thursday.  In class, we discussed the following in regards to that assignment:

1. It is a DCP write-up - three sections of the full report are required (raw data, processed data, and presented data).  
2. Use all the resources available to you in the student handbook, including the anchor paper, the checklists, and the guidelines for tables and graphs.
3. The assignment should be typed, or it will not be accepted.
4. This is an individual assignment.  Even if you have the same data, your own write-up is expected.

Thanks!

Mr. Hill

Lab work, continued

R6 peer reviewed data today; R4 started their osmosis lab.

Homework
R6, please look up your missing pieces and prepare for the Membranes Quiz (2.4).

R4, please e-mail me your data tables and graph at magisterhill@gmail.com before 8AM tomorrow.  

Labwork

R6 completed their first investigative work today; R4 will begin tomorrow.

Homework
R4 - answer pre-lab questions for tomorrow on looseleaf or in journal.  Scroll down to post from Friday for web resources to help you.

R6 - your group must send Mr. Hill via e-mail (magisterhill@gmail.com) by 8AM tomorrow morning:

• raw data table
• presented data (a graph)

Please send these either in microsoft excel or word, as attachments.

The purpose of this is so that we can discuss people's data and choices.  Your final draft of a "DCP" (data collection and processing) section of a lab report will be due next Wednesday.

Osmosis Jones!

Today, we examined a case of osmosis - the diffusion of water across the cell membrane.  We noted that red onion cells shriveled when placed in water (this shriveling of cell is officially called plasmolysis, and it's the same phenomena that makes your mouth dry when you eat a salty snack and your skin wrinkle when you jump into the ocean).  We inferred that water must have left the cell, traveling along its concentration gradient to create an equilibrium of solute concentration inside and out of the cell.

That's the key thing about osmosis: water will move toward areas of high solute concentration.  Think of it as a balancing act - the high concentration needs to be balanced out by adding extra water (like diluting Kool Aid).

Homework
R4 - mini-quiz on membranes (2.4); also, please research the "missing piece" I gave you and bring in something to share on Monday.

R6 - complete all pre-lab questions on looseleaf or in your journal.  If you lost it, the lab handout can be found here:

Lab 1 - Determining the Concentration of the Cytoplasm

In order to help you with this, you should read textbook pages 89-91 about osmosis and consult the following web resources:

Osmosis Animation (from class - but it's longer)
Similar Osmosis Student Lab (may be a springboard for your ideas)

Please e-mail me with questions at MagisterHill@gmail.com

Unit test next Thursday!

First lab

By this time, both classes have completed our first lab.  The task was to observe a cork cell under the microscope, draw it, and then determine how much larger the drawing was compared to the "real" cell.

All groups in all periods were successful at devising a way to measure the actual cell - and remarkably, many of you figured out different ways of doing it that were plausible.  The most common techniques I noticed were:

1. measuring the pointer and using a ratio 
2. measuring the image of the cell in the eyepiece and then working backwards using the magnification
3. measuring the diameter of the field of view and estimating how many cells could fit across the diameter

Well done Class II.  Take note of how much you can accomplish without much direction from me.

Homework

For both classes, your next homework is due Thursday, 9/17.  You are to complete the four magnification questions on the handout given in class (I do not have an electronic copy - hope you didn't lose it!)  Note that these are your first taste of IB-style test questions.  Also, one of these problems could be used as a sample calculation for your assessment statement 2.1.5, regarding magnification.

Best,

Mr. Hill