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Science Chapter 3

Diversity of cells 6th Grade

Ribosome Tiny,round organelles made of protein and other material.
Cytoplasm The fluid inside a cell.
What's the reason why most cells are limited to a very small size? Surface area-to-volume ratio. (SAV)
Cell Membrane A protective layer that covers the cell's surface and acts as a barrier.
Organelle Small bodies in a cells cytoplasm that are specialized to perform specific functions.
Nucleus In a eukaryotic cell, an organelle that contains the cell's DNA and that has a role in growth, metabolism, and reproduction.
Prokaryote An organism that consists of a single cell that does not have a nucleus or membrane-bound organelles.
Bacteria Prokaryotes that are the smallest cells and that have ribosomes.
Archaea Prokaryotes that include extremophiles, organisms that live in extreme conditions.
Eukaryote An organism made up of cells that have a nucleus enclosed by a membrane as well as membrane-bound organelles.
Cell The smallest structure that can perform all the processes necessary for life.
Who was the first person to describe cells? Robert Hooke
Who was the person who discovered single-celled organisms including bacteria? Anton Van Leeuwenhoek
Who was the person who concluded that all plant parts were made of cells? Schleiden
Who as the person that concluded that all animal tissues were made of cells? Schwann
Who was the person that concluded all cells came from existing cells? Virchow
What are the three parts of the Cell Theory? All organisms are made of one or more cells The cell is the basic unit of all living things All Cells come from existing cells
What parts do all cells have? A cell membrane, organelles, cytoplasm, and DNA.
What are the two basic types of cells? A prokaryote cell and a eukaryote cell.
Does a prokaryote have a nucleus? No
Does a eukaryote have a nucleus? Yes
What's the Curly stuff inside the bacterium? DNA
What's the tail? Does it help the bacterium move? It's the flagellum. Yes, It does help it move.
Is the cell membrane more inside the bacterium then the cell wall or no? Yes, the cell membrane is more inside the bacterium then the cell wall.