Writing Assignment

Membranes are essential components of all cells.

1. Briefly describe the structure of a eukaryotic plasma membrane, identifying at least two component macromolecules and describing what their basic function is within the membrane.

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The plasma membrane protects the integrity of the interior of the cell by allowing certain substances in, while keeping other substances out.

2. Summarize the manner in which small molecules are permitted to pass through the membrane ensuring you explain the difference between passive, facilitated, active, and coupled transport by comparing and contrasting them.

3. Finally, explain the difference between endocytosis and exocytosis and provide an example of a molecule (remembering to state its function) that is transferred using this method.

Written Assignment Requirements
Your written assignment should be submitted in a Word document (or similar program) and should be at least 1-2 pages in length, double-spaced with 1-inch margins, and written in Times New Roman size 12 font. You should provide a word count at the end of your written assignment. Cite any reference(s) you use in the preparation of your essay using proper APA format.

For help with APA citations, please refer to the UoPeople APA Tutorials in the LRC .

Written Assignment Peer Assessment
In the unit following the submission of your written assignment, you will peer assess three (3) of your classmates’ assignments according to the instructions found in the Assessment Form. During this peer assessment period, you are expected to provide details in the feedback section of the Assessment Form, indicating why you awarded the grade that you did to your peer. The written assignment grade is comprised of a combination of your submission (90%) and your peer assessments (10%).

Written Assignment Peer Assessment Rubric
For this assignment, your peers will be evaluating your work with the following criteria.

1. Has the student described the structure of the plasma membrane?
2. Have two macromolecules within the plasma membrane been identified and their functions specified?
3. Has the student described the methods of passive, facilitated, active, and coupled transport?
4. Have the differences between the methods of transport been indicated?
5. Has the difference between and endocytosis and exocytosis been explained?
6. Has a molecule that is transferred through the plasma membrane by either exocytosis or endocytosis been identified?
7. Is the assignment well organized and easy to read?


Learning Guide:
The plasma membrane of the cell is a semi-permeable membrane that allows certain molecules and ions across while restricting the movement of others. It is composed of a combination of proteins and phospholipids arranged in a bilayer that together give the membrane its flexibility and facilitate transfers across it. Phospholipids have hydrophilic (water-loving) and hydrophobic (water-repelling) potions for regulating the aqueous cellular environment. Tucked within this bilayer are cholesterol, integral proteins, carbohydrates, and peripheral proteins that function in the various types of facilitated and passive transport of molecules and ions across the cell membrane. Apart from the primary functions of protection and carriage of substances, the plasma membrane of animal cells additionally serves to keep the shape of the cell and to anchor it to other cells to form tissues.

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