biology

UMUC Biology 102/103Lab 3: Cell Structure and FunctionINSTRUCTIONS: •    On your own and without assistance, complete this Lab 3 Answer Form electronically and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).•    To conduct your laboratory exercises, use the Laboratory Manual that is available in the WebTycho classroom (Reserved Reading or provided by your instructor) or at the eScience Labs Student Portal. Laboratory exercises on your CD may not be updated.•    Save your Lab3AnswerForm in the following format:  LastName_Lab3 (e.g., Smith_Lab3).•    You should submit your document in a Word ( or x) or Rich Text Format (.rtf) for best compatibility.Experiment 1: Labeling (consult the Lab 3 Introduction for more details)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 Questions1.    For each structure identified, do you think its location affects its ability to function?  Why or why not? (Hint: those buried deep in the cell probably do different things than those closer to the cell membrane)2.    Draw a labeled diagram of a small section of the plasma membrane and briefly describe its structure and function.3.    Describe the differences between animal and plant cells.4.    Which of the following structures are present in both prokaryotic and eukaryotic cells?   5.    Where is genetic material found in plant cells?6.    Mitochondria are the only organelles that contain their own DNA (circular) and have a double membrane.  Why do you think this might be so?Hint 1:  Where else do we see circular DNA?)Hint 2:  What do you know about the relative age of eukaryotic cells?)7.    How is the structure of the plant’s cellulose-based cell wall related to its function?8.    Defects in structures of the cell can lead to many diseases.  Pick one structure of a eukaryotic cell and develop a hypothesis as to what you think the implications would be if that structure did not function properly. 9.    Using books, articles, the internet, etc. conduct research to determine if your hypothesis was correct. 

UMUC Biology 102/103

Lab 3: Cell Structure and Function

INSTRUCTIONS:

· On your own and without assistance, complete this Lab 3 Answer Form electronically and submit it via the Assignments Folder by the date listed on your Course Schedule (under Syllabus).

· To conduct your laboratory exercises, use the Laboratory Manual that is available in the WebTycho classroom (Reserved Reading or provided by your instructor) or at the eScience Labs Student Portal. Laboratory exercises on your CD may not be updated.

· Save your Lab3AnswerForm in the following format: LastName_Lab3 (e.g., Smith_Lab3).

· You should submit your document in a Word ( or x) or Rich Text Format (.rtf) for best compatibility.

Experiment 1: Labeling (consult the Lab 3 Introduction for more details)

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

 

Questions

1. For each structure identified, do you think its location affects its ability to function? Why or why not? (Hint: those buried deep in the cell probably do different things than those closer to the cell membrane)

2. Draw a labeled diagram of a small section of the plasma membrane and briefly describe its structure and function.

3. Describe the differences between animal and plant cells.

4. Which of the following structures are present in both prokaryotic and eukaryotic cells?

5. Where is genetic material found in plant cells?

6. Mitochondria are the only organelles that contain their own DNA (circular) and have a double membrane. Why do you think this might be so?

Hint 1: Where else do we see circular DNA?)

Hint 2: What do you know about the relative age of eukaryotic cells?)

7. How is the structure of the plant’s cellulose-based cell wall related to its function?

8. Defects in structures of the cell can lead to many diseases. Pick one structure of a eukaryotic cell and develop a hypothesis as to what you think the implications would be if that structure did not function properly.

9. Using books, articles, the internet, etc. conduct research to determine if your hypothesis was correct.

Experiment 2: Directions and Concentration Gradients

Table 2: Water Movement

 

 

 

 

 

 

Initial Volume	Sucrose %	Prediction: Will water move in or out?	Final Volume
Bag #1 10 mL
Bag #2 10 mL
Bag #3 10 mL
Bag #4 10 mL

Questions

1. For each of the bags, identify whether the solution inside was hypertonic, hypotonic or isotonic in comparison to the beaker solution it was placed in.

2. Which bag increased the most in volume? Why?

3. What does this tell you about the relative tonicity between the contents of the bag and the solution in the beaker?

4. What would happen if bag 1 is placed in a beaker of distilled water?

 

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