7-1 intro to cells
TRANSCRIPT
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Chapter 7-1Chapter 7-1Cellular Structures and Cellular Structures and
Function Function Bio 30 NWRCBio 30 NWRC
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STUDY OF:STUDY OF:
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Blood cell
Lung cell
Nerve cell
Leaf cell
Bone cell
Bacteria cell
Sperm & Egg cells (Sex cells)
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Cell
Cell Theory
Nucleus
Eukaryote
Prokaryote
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People knew nothing about cells until the discovery of the Microscope.
1665 ~Robert Hooke was the first person to see cells. He is known for making up the word “Cell”.
(Cork – plant material)
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1683~Anton van Leeuwenhoek – was the first person to observe tiny living organisms in pond water.
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Matthias Schleiden – (1838) discovered that plants are composed of cells Theodor Schwann – (1839) discovered that animals are composed of cells Rudolph Virchow – (1855) stated that all cells come from other cells
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Janet Plowe – (1931) the cell membrane is a physical structure, not an interface between two liquids
Lynn Margulis – (1970) certain organelles were once free-living cells themselves
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All living things are made up of cells.
Cells are the basic units of all living things.
All cells are produced from existing cells.
Schleiden, Schwann, Virchow
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Compound Light Compound Light MicroscopeMicroscope
Uses a series of glass lenses to magnify images up to about 1000X
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Electron Light Electron Light MicroscopeMicroscope
Uses magnets to beam electrons at tissues – is capable of much greater magnification than light microscopes
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Click to see Click to see magnifications magnifications
Click here! Click here!
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the smallest functioning part of an organism. vary in size and shape. shape is related to function. most are microscopic. Unicellular = composed of ONE cell Multicellular = composed of MANY cells
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Key Note:ALL Cells have:
*a barrier called a Cell membrane
*DNA
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Prokaryotes smallest & simplest
cells lack a nucleus lack organelles no specialized functions.Example: BacteriaExample: Bacteria
Eukaryotes have a nucleus
have organellesHave specialized functions. Example:Example:plant & animal cellsplant & animal cells
Click here
Click here
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Prokaryotes Prokaryotes are the Prokaryotes are the
single-celled organisms, single-celled organisms, such as bacteria.. such as bacteria.. Unlike Eukoryotes, Unlike Eukoryotes, prokaryotes do not prokaryotes do not have a nucleus that have a nucleus that houses its genetic houses its genetic material. Rather, the material. Rather, the genetic material of a genetic material of a prokaryote cell consists prokaryote cell consists of a large DNA of a large DNA molecule in the molecule in the cytoplasm cytoplasm
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Prokaryotes One differentiating One differentiating
characteristic is that characteristic is that prokaryotes are prokaryotes are asexualasexual, , meaning their offspring meaning their offspring nearly always bear the nearly always bear the exactexact characteristics of characteristics of the parent cell. (In fact, the parent cell. (In fact, the cell essentially the cell essentially replicates itself replicates itself according to its own according to its own DNA and then divides DNA and then divides itself from the newly itself from the newly created cell.) created cell.)
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Eukaryotes Eukaryotic cellsEukaryotic cells - -
Can be unicellular Can be unicellular ((protistsprotists such as such as yeast, paramecium yeast, paramecium and amoebae) or and amoebae) or multicellular (a multicellular (a system of division system of division of labor such as of labor such as fungi, animals, and fungi, animals, and plants). plants).
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Eukaryotes Eukaryotic DNA is Eukaryotic DNA is
enclosed by a enclosed by a membrane making membrane making a well defined a well defined nucleusnucleus. .
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Eukaryotes Cell division in Cell division in
eukaryotes is different eukaryotes is different from prokaryotes. There from prokaryotes. There are two types of division are two types of division processes. In mitosis, one processes. In mitosis, one cell divides to produce cell divides to produce two genetically-identical two genetically-identical cells. In meiosis, which is cells. In meiosis, which is required in sexual required in sexual reproduction, one diploid reproduction, one diploid cell (having two instances cell (having two instances of each chromosome, one of each chromosome, one from each parent) from each parent) undergoes recombination undergoes recombination of each pair of parental of each pair of parental chromosomes.chromosomes.
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(Eukaryotic)(Eukaryotic)
Plant Cells have cell walls
have chloroplasts have a large vacuole tend to be squared or rectangular
Animal Cells have only cell membranes have smaller vacuoles tend to be round
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Plant CellPlant Cell Animal Cell
Smooth & Rough Endoplasmic Reticulum
Nuclear Envelope Nucleus Nucleolus
Cell wall Cell wall
LeucoplastLeucoplast
Golgi bodies Ribosome Cell
MembraneCytoplasmMitochondria
ChloroplastChloroplast
VacuoleVacuole
Lysosome
Centriole
Both Plant & Animal Cells
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AssessmentAssessment 1. 1. With more With more
sophisticated sophisticated tools scientists tools scientists have been able have been able to learn more to learn more about the cell about the cell and its and its structuresstructures
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AssessmentAssessment 2. 2. Light Light
microscopes use microscopes use glass lenses and glass lenses and visible light. visible light. Electron Electron microscopes use microscopes use beams of beams of electrons and electrons and magnetsmagnets
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AssessmentAssessment 3. 3. 1. all known living things are made up of cells. 1. all known living things are made up of cells.
2. the cell is structural & functional unit of all 2. the cell is structural & functional unit of all living things.living things. 3. all cells come from pre-existing cells by 3. all cells come from pre-existing cells by division. division. (Spontaneous Generation does not (Spontaneous Generation does not occur). occur). 4. cells contains hereditary information which 4. cells contains hereditary information which is passed fromis passed fromcell to cell during cell division. cell to cell during cell division. 5. All cells are basically the same in chemical 5. All cells are basically the same in chemical composition. composition. 6. all energy flow (metabolism & 6. all energy flow (metabolism & biochemistry) of life occurs biochemistry) of life occurs within cells. within cells.
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AssessmentAssessment 4. The plasma 4. The plasma
membrane helps membrane helps control what goes control what goes into and out the into and out the cellcell
The organelles The organelles carry cellcarry cell
out specialized out specialized function in the cellfunction in the cell
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Further StudyFurther Study This website has an excellent review This website has an excellent review
of all these topics of all these topics