CHEMISTRY

Lab 3: Cell Structure and Function

INSTRUCTIONS:

 

·        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.

concept_tab_l

Materials:

Onion (allium) Root Digital Slide Images

 

Procedure

  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

Lab3_Experiment1_PostLabQuestion1

 

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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