Test 1 (Cell Theory) Flashcards
What is magnification?
How large an image is.
What is resolution?
The ability of the microscope to show two close objects separately. (How clear the image is)
What are the kingdoms of life?
There are 6 kingdoms of life and they are; archaea (prokaryotes), monera (prokaryotes), protista (prokaryotes and some eukaryotes), fungi (eukaryotes and some prokaryotes), plantae (eukaryotes), animalia (eukaryotes).
What is cell theory?
The three key concepts of cell theory are:
- Cells are the smallest units of life
- Cells can only come from existing cells
- All living organisms are made of cells
Who proposed cell theory?
- Schleiden: German botanist
- Schwann: German zoologist
- Virchow: German pathologist
When was cell theory proposed?
It was proposed in the late 1830’s
What are the 3 main parts of all cells?
The three main parts of cells are:
- Cytoplasm
- Organelles
- Plasma membrane
What are the benefits of using a light microscope?
The benefits are:
- Real color can be seen
- Field of view is large enough to see whole organism
- Easy to prepare sample
- Living material can be observed
What are some things about electron microscopes?
- Great resolution and magnification that shows the ultrastructure of a cell
- Preparation is lengthy
- Material to be observed is dead
What are the sizes of most plant and animal cells?
They are between 10-100 micrometers
What are some exceptions to the cell theory?
- Skeletal Muscle: They are 300 mm long or more (breaking the SA:V ratio, and they have hundreds of nuclei)
- Giant Algae: They only have 1 nucleus and can be 100 mm long
- Aseptate Fungi: Made of thread like structures called hyphae. They are long undivided parts of hyphae that have many nuclei
What are the functions of life in unicellular organisms?
They are:
- Homeostasis (keeps internal conditions within limits)
- Response
- Metabolism
- Growth
- Reproduction
- Excretion
- Nutrition
How do you calculate magnification?
To find magnification: take the length of the scale bar that you measured and divide it by the length shown on the scale bar.
OR
Take the size of the image and divide by the size of the specimen
How do you calculate actual size?
To find actual length: take the measured length of the image and divide it by the magnification
OR
take the length of the image and divide it by the measured length of the scale bar and multiply the answer by the scale bar unit
What are the SI units?
- Tera (T): 1,000,000,000,000 - 10 to the 12
- Giga (G): 1,000,000,000 - 10 to the 9
- Mega (M): 1,000,000 - 10 to the 6
- Kilo (k): 1,000 - 10 to the 3
UNIT (Joules, grams, meters, etc…)
- Deci (d): 0.1 - 10 to the -1
- Centi (c): 0.01 - 10 to the -2
- Milli (m): 0.001 - 10 to the - 3
- Micro (u): 0.000001 - 10 to the -6
- Nano (µ): 0.000000001 - 10 to the -9
- Picto (p): 0.000000000001 - 10 to the -12