Acess to Science: Cells

Assignment: Microscopy, Cell Structure
And Functions

Table of Contents

Table of Contents
Task 1: 3
TASK 2: 4
I) Four Main Type of Animal Tissues 4
ii) Plant Tissues: 6
iii) Electron Microscope: 7
iv) Functions of Organelles 9
v) Current Model of the Cell Membrane: 10
Task 3 11
ii) Osmosis Experiment Report 12
Aim 12
Introduction 12
Hypothesis 12
Risk Assessment and Health and Safety: 12
Apparatus and Materials: 13
Procedure: 13
Results: 14
Analysis: 16
Conclusion 16
Evaluation: 16
Sources of Error: 17
Anomalous Results: 17
Biological or Industrial Significance: 17
iii) Process Of Mitosis and Meiosis 18
Bibliography: 19

Task 1:  
Light Microscope (LM) uses visible light and magnifying lenses to examine objects that are not visible to the naked eye. LM provides better resolution than the eye which allows to distinguish sub-entities for example defining cell structure.
When observing the onion skin cell, we noticed that the cells took on a brick-like structure and within the cells, small dots (the nuclei) can be seen. When we viewed the onion skin cells at 400X total magnification, we noticed the nuclei of the cells looked clearer and larger and we were able to study the cell with more understanding than when we used the first magnification. The organelles that we were able to see in this type of cell were the nucleus, the cytoplasm and the cell wall.
When we viewed the cheek cells at 40X total magnification, we noticed that the cells were secluded and spread out (see diagram provided). At 400X total magnification, we were only able to view one cell at a time, due to the fact that the cells were separated from each other. The organelles that were visible in this type of cell were the nucleus, the cytoplasm and the cell membrane.


I) Four Main Type of Animal Tissues...