Lab 3: Cell Structure and Function



·        On your own and without assistance, complete this Lab 3Answer Sheet electronically and submit it via the Assignments Folder by the date listed intheCourse 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 3Answer 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 three major similarities and differences between prokaryotic and eukaryotic cells.




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




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


Experiment 1: Cell Structure and Function

The structure of a cell dictates the majority of its function. You will view a selection of slides that exhibit unique structures that contribute to tissues function.



Onion (allium) Root Digital Slide Images



  1. Examine the onion root tip digital slide images on the following pages. Then, respond to the Post-Lab Questions.
Onion Root Tip: 100X
Onion Root Tip: 100X



Onion Root Tip: 1000X
Onion Root Tip: 1000X


Onion Root Tip: 1000X
Onion Root Tip: 1000X




Onion Root Tip: 100X. Each dark circle indicates a different nucleus.
Onion Root Tip: 100X. Each dark circle indicates a different nucleus.


Onion Root Tip: 1000X
Onion Root Tip: 1000X


Post-Lab Questions

1. Label each of the arrows in the following slide image: A=Chromosomes, B=Nucleus, C=Cytoplasm, D=Cell Wall



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.


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