003 - The Cell
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Resolution is the ability to distinguish two separate points or objects.
The compound microscope was invented by Anton van Leeuwenhoek.
The smallest unit of life is the cell.
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The compound microscope uses light to magnify objects.
It can magnify objects 400 to 1000 times.
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The transmission electron microscope was first invented in 1932.
It uses a beam of electrons to magnify the specimen.
It can magnify up to 600,000 times.
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The scanning electron microscope passes a beam of electrons over the specimen.
It projects a 3D image onto a computer.
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The topic is "The Cell."
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Atoms are groups of protons, electrons, and neutrons.
Molecules are groups of atoms.
Organelles are specialized parts of cells.
Cells are the smallest unit of life.
Tissues are groups of similar cells.
Organs are groups of tissues with a function.
Systems are groups of organs with a purpose.
Organisms are single lifeforms.
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A cell is the smallest functional unit of life.
All living things are composed of cells.
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All living things share five characteristics: reproduction, need for energy, production of waste, growth, and response and adaptation to the environment.
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The cell theory states that all organisms are composed of one or more cells.
The cell is the smallest functional unit of life.
All cells are produced from other cells.
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There are two types of cells: prokaryotic and eukaryotic.
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Prokaryotic cells are represented by a diagram.
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Eukaryotic cells are represented by a diagram.
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Prokaryotic cells have no organized nucleus, and genetic material is in the cytoplasm.
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Bacteria and blue-green algae are examples of prokaryotic cells.
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Prokaryotic cells have no organized nucleus, and genetic material is in the cytoplasm.
The chromosome may be in a circular shape called a plasmid.
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A diagram shows a plasmid.
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The process of cloning using recombinant DNA is described.
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Prokaryotic cells have no organized nucleus, and genetic material is in the cytoplasm.
The chromosome may be in a circular shape called a plasmid.
Prokaryotic cells have no organized organelles except for ribosomes.
They are smaller than eukaryotic cells.
Prokaryotic cells are the oldest known form of life.
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A diagram shows the anatomy of a bacterium.
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Eukaryotic cells have an organized nucleus and organelles.
They are larger than prokaryotic cells.
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There are two types of eukaryotic cells: plant and animal.
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Plant cells and animal cells differ in several ways.
Only plant cells contain chloroplasts.
Plant cells contain a large central vacuole.
Only plant cells contain a cell wall.
Only animal cells contain lysosomes.
Animal cells have centrioles.
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The structure and function of the nucleus are described.
The nucleus controls the daily activities of the cell.
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Inside the nucleus, there is a nucleolus.
The nucleolus produces RNA and ribosomes.
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Inside the nucleus, DNA is organized into multiple, linear chromosomes.
Chromatin represents the mass of stringy, entangled chromosomes observed during interphase.
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A diagram shows a human chromosome.
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The nucleoplasm is a jelly-like fluid that supports the contents of the nucleus.
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The cytoplasm is a gel-like substance inside the cell.
It dissolves nutrients throughout the cell and suspends organelles.
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The mitochondrion is an organelle within all cells.
It looks like a long worm inside a sandwich bag.
It is the powerhouse of the cell and produces ATP.
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Vacuoles are hollow organelles used for storage within the cell.
Plant cells contain a large central vacuole.
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A diagram shows a eukaryotic plant cell and a eukaryotic animal cell.
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Ribosomes are small organelles responsible for protein synthesis.
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The endoplasmic reticulum is a long system of tubes and canals throughout the cell.
It provides for intracellular transport of molecules.
There are two types of endoplasmic reticulum: rough ER and smooth ER.
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A diagram shows the structure of the endoplasmic reticulum.
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Both rough ER and smooth ER are present in the cell.
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The Golgi complex looks like a stack of pancakes.
It packages materials for export and facilitates intercellular transport.
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Lysosomes are spherical bodies that contain enzymes for intracellular digestion.
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A diagram shows the mitochondrion, lysosomes, and Golgi complex.
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Centrioles are rod-like structures containing microtubules.
They are involved in cell division in animals.
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A diagram shows centrioles, spindle fibers, and chromosomes.
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Chloroplasts are organelles found only in plant cells.
They capture light energy and are the site of photosynthesis.
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The cell wall is the thick outer wall of a plant cell.
It provides structure and support to the plant.
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The cell membrane retains cell contents and controls what enters and leaves the cell.
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A diagram shows the structure of the cell membrane.
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A labeled diagram of a plant cell anatomy is shown.
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A labeled diagram of an animal cell anatomy is shown.