Food Lab Procedure

Copy the following procedure into your notebook on the same page(s) as "Food Lab Procedure."

You can click on either of these images to make them larger.

If you do not have the procedure written (and it must be hand written) down in your notebook you will not be able to participate in the lab and therefore receive a zero.

Simple carbohydrate

1.              Add 5ml distilled water using a pipette to a test tube.

2.              Add 1ml or 1 gram of food sample to test tube.

3.              Add 20 drops of Benedicts solution.

4.              Place test tube in hot water bath for 10 minutes.

Complex carbohydrate

1.              Add 5ml of water using a pipette to the test tube.

2.              Add 1 ml or 1 gram food sample to test tube.

3.              Add 20 drops IKI solution.

Procedure: Amino Acids

1.              Add 5ml distilled water

2.              1 ml  or 1 gram food

3.              20 drops biuret solution

Fats

1.     Add 5 ml water using a pipette to a test tube.

2.     1 ml or 1 gram of food sample to the test tube.

3.     20 drops Sudan IV to the test tube.

 

Macromolecules Mini Project

Today in class students had time to work on their Macromolecules Mini Project.  You do need to have a bibliography for this project.  Please use the MLA format for your bibliography.  EasyBib is a great resource for helping make a bibliography.

In case you 'misplace' the expectations for the project, you can read the guidelines below.

Part 1: Create a poster with the following information for your macromolecule: The name of macromolecule Provide a short description of the macromolecule’s functions in the cell and in our bodies. At least three large, colorful, labeled images of the macromolecule should be on the poster.

Part 2: Create a one- page handout for the class that answers the questions listed under your macromolecule (or protein shape). The handout does not need to be typed, it can be hand written. Keep in mind that this will be photocopied and given to the rest of the class.

This mini project is due on Tuesday September 27th in class. One representative from the group will share the information on your topic with the class.

Carbohydrates: 
1. What defines a carbohydrate and what is its function in both plant and animal cells?
2. Monosaccharides (-oses), the ratio of C:H:O
3. Disaccharides: reaction used to join them, removal of water, sucrose, maltose and lactose.
4. Polysaccharides: starches (glycogen; cellulose) 
5. What are the main uses of carbohydrates in cells (plants and animals)?

Lipids: 
1. Define lipids—insolubility in water; function.
2. Types of lipids—triglycerides, phospholipids, steroids
3. What are the main uses of lipids in cells

Proteins: 
1. Define proteins and their function
2. What is an amino acid (monomers joined via dehydration synthesis)
3. How is a Peptide bond formed?
4. What are the main uses of proteins in cells?

Protein Shape:
1. What are the various levels in protein shape? (primary, secondary, tertiary, quaternary)
2. How does structure relate to function with regard to proteins?
3. What does it mean to denature a protein, give an example.

Nucleic Acids: 
 1. Define, compare and give examples of the two types of nucleic acids (structure, location and function).
2. What are the main uses of nucleic acids in cells?

Section 2-4 Enzymes

G period ONLY:
Use the PowerPoint below to help you complete the guided notes sheet you were given in class.  The penultimate (2nd to last slide) is for questions 11 & 12.   Also, on the penultimate slide, click on the word "Enzymes" in the header to link to a short video clip. Draw the diagram on the last slide on the back of the paper.
Click the white box to begin viewing the slideshow.

Section 2-4, Enzymes

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Chemistry of Carbon & Intro to Macromolecules

Today C period (tomorrow for G period), learned about the importance of carbon in macromolecules. We also talked about the four major groups of macromolecules: carbohydrates, lipids, proteins and nucleic acids.

On Friday you will work in assigned groups on a mini macromolecules project.

If you are in C period:

Remember that your lab report and completed rubric are due tomorrow at the start of class.

If you are in G period your lab report and completed rubric are due on Thursday at the start of class.

Proteins

Today we focused on the third class of macromolecules: Proteins.

Brace yourself for this shocking discovery....proteins are formed when amino acids are joined together by peptide bonds and when water is removed! Are we noticing a trend yet....?

Proteins having many functions including as enzymes and transport molecules. We didn't spend a lot of time on enzymes because we learned about this in the fall. Click here to see a video of how enzymes work.

Proteins play in an important role in transport of molecules across a cell membrane. As you know, phospholipids have a hydrophylic head and hydrophobic tail. In order for the transport proteins to maintain their location in the bilayer they have to have polar and nonpolar components.

There is no homework for Monday other than to study for your test on Friday May 13th.

Testing for Macromolecules

Today we started testing various foods for macromolecules. Tomorrow (or Thursday) we will continue testing and wrap up the experiment.

Homework: none.

Click the picture to read about what we did in class and for more information on macromolecules in food.

Macromolecules

Today students had a reading quiz on section 2-3. After going over the quiz students were given a worksheet on the types of Macromolecules. We didn't get a chance to talk about food pyramids around the world, but hopefully we will get a chance with Thursday's classes.

Homework: Review the PowerPoint below with the information about the lab for Friday. Before coming to class on Friday you should fill the in the table of contents in the lab section of your notebook with the following information:

Date: 24 September
Title: What's in your food?
Partner: (leave blank for now)
Page: 5

On page 5 in your notebook (a sheet of notebook paper) copy down the table from the slide titled "Background Information" (this is slide number 6).


A note about testing for lipids: We may not have Sudan IV solution, so we may be doing the less glamorous "paper towel test."

Please also bring a food you would like to test.

Lab Procedure

Identifying Macromolecules In Food

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Macromolecule Presentations

Today and tomorrow students will be giving their macromolecule PowerPoint Presentations. Please bring the blue rubric sheet to class with you.

(the cartoon reads: "I sort of thought your presentation was going to be in PowerPoint.")

Macromolecules Guiding Questions

Below are the guiding questions for each section of the project. Click on the image to open it in a new window.

Macromolecules

After a short quiz to wrap up chemistry and chapter 2, students were introduced to chapter 3 on the molecules of life. Rather than have me lecture on the material, students will teach each other. Each group will need to have a handout, visual and give an 8 minute oral explanation of one of the sections below. Students have been given a list of key points to address in each section as well as a rubric for their projects. A block will present their lessons on Thursday (9.18) and D and C blocks will present on Friday (9.19).

Sections & Topics:

Carbohydrates: 3.4, 3.5, 3.7

Fats: 3.8, 3.9

Proteins: 3.11, 3.12, 3.13

Protein shape: 3.14, 3.15, 3.16, 3.17, 3.18

Nucleic acids: 3.20, 10.2, 10.3

Homework: Work on your project.