Biology 1 Yr7
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Microscope
Used to see things that are too small for our eyes
What are the tree main steps to follow when looking through a microscope?
• Start with the lowest magnification objective lense • Focus using the focus wheels • Increase the magnification if needed
What happens to the image when we focus a microscope?
The image becomes clearer
Name the five main parts of a microscope
Arm, stage, stage clips, objective lens, light bulb
Organism
A living thing
Unicellular Organism
An organism made of only one cell
Multicellular Organism
An organism made of more than one cell
Cell
The basic building block of all life
Sub-cellular structure
The small part of the cell with a specific function
Name the four sub-cellular structures found in all types of cell
Cell membrane, cytoplasm, cell membrane, ribosomes
Why should a substance be thin when looking through a microscope?
To let light through
Name 5 sub-cellular structures found in animal cells
Cell membrane, nucleus, ribosomes, cytoplasm, mitochondria
Name eight sub-cellular structures found in plant cells
Cell membrane, cytoplasm, ribosomes, mitochondria, nucleus, chloroplasts, cell wall, vacuole
Which sub-cellular structures are found in plant cells but not in animal cells?
Chloroplasts, cell wall, vacuole
What is the function of the nucleus?
Control centre/contains DNA
What is the function of the cell membrane?
To control what leaves and enters the cell
What is the function of the cytoplasm?
Chemical reactions
What is the function of mitochondria?
Respiration
What is the function of ribosomes?
Making proteins
What is the function of the cell wall?
Support
What is the function of the vacuole?
To keep the cell rigid
What is the function of the chloroplasts?
Photosynthesis
How big something looks
Image size
How big something is
Actual size