Bio102

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UMUC Biology 102/103

Lab 3: Cell Structure and Function

INSTRUCTIONS:

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

* To conduct your laboratory exercises, use the Laboratory Manual located under Course Content. Read the introduction and the directions for each exercise/experiment carefully before completing the exercises/experiments and answering the questions.

* Save your Lab 3 Answer Sheet in the following format: LastName_Lab3 (e.g., Smith_Lab3).

* You should submit your document as a Word (.doc or .docx) or Rich Text Format (.rtf) file for best compatibility.

Pre-Lab Questions

1. Identify the major similarities and differences between prokaryotic and eukaryotic cells.

2. Where is the DNA housed in a prokaryotic cell? Where is it housed in a eukaryotic cell?

3. Identify three structures which provide support and protection in a eukaryotic cell.

Onion Root Tip: 1000X

Onion Root Tip: 1000X

A

A

B

B

C

C

D

D

Experiment 1: Cell Structure and Function

Post-Lab Questions

1. Label each of the arrows in the following slide image:

2. What is the difference between the rough and smooth endoplasmic reticulum?

3. Would an animal cell be able to survive without a mitochondria? Why or why not?

4. What could you determine about a specimen if you observed a slide image showing the specimen with a cell wall, but no nucleus or mitochondria?

5. Hypothesize why parts of a plant, such as the leaves, are green, but other parts, such as the roots, are not. Use scientific reasoning to support your hypothesis.

Experiment 2: Osmosis - Direction and Concentration Gradients

Data Tables and Post-Lab Assessment

Table 3: Sucrose Concentration vs. Tubing Permeability

Band Color | Sucrose % | Initial Volume (mL) | Final Volume (mL) | Net...