Week_7_Cell

Human Biology On-line

Week 7

Cell Biology

Biochemistry Test results can be viewed on Learningpoint

The Cell Biology Unit consists of three main parts:
1. The Cell: structure and function
2. Moving substances: within the cell, into/out of the cell
3. Cellular Work: Making ATP

We'll be working on the first part this week: Structure and Function

q Read and OUTLINE (take notes) for textbook pages 40-49 (at least 1 page) and 54-55 (at least 1 page).

q Fill in the blanks on LB pages 17 Front - p.18 Front and Back. Use the document "Cell Notes" to help you. (Found in LearningPoint/Course Documents).

q Do LB pgs 20-22

q Do Back of LB P. 17 - Cell Structure and Function Work Sheet

q STUDY FOR AN IN-CLASS QUIZ (NO NOTES) on Cell Structure and Function. To practice, do LB page 23 front. Try to do it without notes!

q Answer the Question on the Week 7 Discussion Board in Learningpoint, dealing with Cells. Make sure you give a complete answer, and reply back to at least 2 other students in the class.

Please Disregard the following information. This is only for students that did not understand the Monosaccharides in 3-D assignment from last week.

q Activity: Monosaccharides in 3-D (see below). Use the web browser http://www.terravivida.com/vivida/monosaccharide/ to answer questions #1-5 in part 1 (below) DueWed. 10-10-07

MONOSACCHARIDES IN 3-D

(From Brooks/Cole Human Biology Companion Website)

Carbohydrates are the most abundant biological compounds. Cells use carbohydrates as structural building blocks and energy resources. Biochemically, we recognize three different groups of carbohydrates, the monosaccharides, the oligosaccharides, and the polysaccharides. Glucose is an example of a monosaccharide, sucrose an oligosaccharide, and starch a polysaccharide.

Monosaccharides can be further divided and classified into various groups depending on their chemical structures. Glucose is a hexose because it contains six carbon atoms. Ribose, with five carbon atoms, is a pentose. We also recognize biologically important tetroses (with four carbon atoms) and trioses (with three carbon atoms). Monosaccharides may also be classified as either aldoses or ketoses depending on the functional groups attached to the molecule. An aldose, such as glucose, will contain a functional aldehyde group whereas a ketose (such as fructose) contains a ketone group.

Although represented as two-dimensional flat units in most texts, the carbohydrates form a group of diverse three-dimensional molecules. Because the carbon atoms can rotate freely around their chiral centers, the carbohydrates have a full range of stereometric isomers.

ACTIVITY

In this activity you will access Jon Maber's Monosaccharide Browser and view space-filling projections of monosaccharides. You will view monosaccharides of varying structures, both ketoses and aldoses.

Use your browser to go to http://www.terravivida.com/vivida/monosaccharide/

Part 1.

Choose Monosaccharide Browser. It may take a few moments to load.

1. D-Glucose should already be on the Browser. What atoms do the black, red, and grey spheres represent?

2. Use the Reverse All button to view L-Glucose. How does D-Glucose differ from L-Glucose?

3. Choose the Ketose (right under Aldose) to see a six-carbon ketose. What six-carbon ketose did you view?

4. How did the ketose differ from the aldose?

5. Try clicking some of the other buttons. Describe two other molecules you find.

Next week's assignments

Human Biology On-line
Instructor: Ms. Janda
Mt. Carmel High School
9550 Carmel Mountain Road
San Diego, California 92129
(858) 484-1180
Last updated: 10/01/2008