levels of organization organism organ organelle tissue organ system cell page 3 1 2 3 4 5 6
TRANSCRIPT
Levels of Organization
Organism
Organ
Organelle
Tissue
Organ System
Cell
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1
2
34
5
6
What are the differences between plant & animal cells?
square shape
centriole
circular shape
cell wall
chloroplasts
large vacuole
small vacuole
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Biotic vs Abiotic
soil
oxygen
human
earthworm
mushroom
sunlight
maple tree
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How do little elephants grow up to be BIG elephants?
Why do animals shed their skin?
A. Living Organisms have a Life Cycle
1. Begins with the organism’s formation
2. Followed by growth & development
3. Ends in death
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B. Cells also have life cycles.
C. The cell cycle is a series of events that takes place from one cell division to the next.
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1. It takes different cells different amounts of time to complete a cell cycle
2. Some cells constantly repeat the cyclea. example: Red blood cells
Skin cells
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Cytokinesis
Prop
hase
Interphase
Telophase
Anaphase
Met
apha
se
Cell growthDNA
(chromosomes) are duplicated
Cell prepares for divisionM
itosis
Cell DivisionResponsible for:
1.Growth2.Repair3.Replacement4.Reproduction
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1. Mitosis
a. Part of a larger cell cycle b. Occurs in the nucleus of eukaryotic
cellsc. Responsible for growth and repair,
replacement. d. Replaces the entire lining of the
small intestine
1)Liver cells only divide for repairing
2) Nerve cells do not divide
3) New cells arise by division of existing cells; Resulting cell is capable to divide again
Mitosis Notes
Cell division occurs in a series of stages or phases
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Preparation for mitosis:
Interphase not a part of mitosis
genetic material is (doubled)duplicated.
CELL MEMBRANENucleus
CytoplasmPAGE 6
Interphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htmPAGE 6
1. Prophase
Mitosis beginsnuclear envelope disappearschromosome pairs appear and
spindle fibers form between the poles
CentriolesSister chromatids
Spindle fibersPAGE 6
Prophase
Prophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
2. Metaphase
Chromosome pairs line up in the middle of the cell
Chromosomes attach to the spindle fibers
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Centrioles
Spindle fibers
Metaphase
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Metaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
3. Anaphase
Chromosomes separate & are pulled to opposite ends of the cell
Centrioles
Spindle fibers
Anaphase
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Anaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
4. Telophase
nuclear envelope forms againchromosomes begin to
separate begin to see two cells
mitosis ends
NucleiNuclei
Chromatin
Telophase
Telophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Cytokinesis
Cytoplasm divides cell membrane moves inward
(animal cell) to create 2 daughter cells each cell has its own nucleus with identical nuclei
Cytokinesis(animal cell)
Cytokinesis:Pinching InANIMAL CELLS
Cytoplasm divides cell plate forms in the middle
of the cell
(plant cell) each cell has its own nucleus with
identical nuclei
Cytokinesis
Cytokinesis(plant cell)
Cytokinesis: Cell plateANIMAL CELLS
Pink Mice Are Totally Cute
Mitosis Animation
http://www.cellsalive.com/mitosis.htm
http://www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/MitosisFlash.html
Mitosis in PlantsMitosis in Plants
Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
Plant Mitosis -- ReviewInterphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
2. Meiosis
a. Cell divides twice to become a gamete (sex cell)
b. Will not divide any further until fertilization.
E. There are two types of reproduction among living organisms.
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1. Asexual Reproduction – a new organism is produced from one organism.
a. The new organism has hereditary material identical to the parent.
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Name of organism Type of Asexual Reproduction
potato budding
Strawberry plant runners
Hydra budding
Sea star, planaria, sponges
regeneration
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F. Sexual Reproduction 1. Two sex cells join to form a zygote, which will develop into a new organism that is
not identical to the parents.
a. There are two types of sex cells.
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2. Eggs are made in the female reproductive organs called the ovaries.
Eggs
Sperm
1. Sperm are made in the male reproductive organs, called the testes.
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haploid + haploid = diploid 23 + 23 = 46
+
3. Sperm + Egg zygote
This is called fertilization.
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Cells
Body Sex Diploid Haploid
46 chromosomes 23 chromosomes
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2. Meiosis – produces four haploid sex cells from one diploid cell, this makes sure that offspring will have the same number of chromosomes as the parent organisms.
Meiosis allows the creation of unique individuals through sexual reproduction.
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3.What is the difference between diploid & haploid?
a. diploid – cell whose similar chromosomes occur in
pairs (2n)
b. haploid – cell that has half (n) the number of chromosomes as body cells.
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46 Chromosomes(diploid)
23 Chromosomes(haploid)
Skin Cell
Heart Cell
Muscle Cell
Liver CellStomach Cell Sperm CellEgg Cell
Draw this table in your notes on the bottom of page 10.
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Let’s Practice!
Organism Diploid Number Haploid Number
Mouse 20
Chicken 78
Tomato 12
Housefly 12
Human 46
24
23
40
6
39
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What is DNA?Deoxyribonucleic Acid
Contains the genetic information: located in the nucleus
Shape of it is a double helix: looks like a spiral staircase
DNA is made up of many repeating units called nucleotides
5 carbon sugar
Phosphate group Nitrogenous Base
Twisted ladder
DNA Structure – Watson and Crick (1953)
Rosalind Franklin X-Ray photo of DNA
(1952)
DNA(Deoxyribonucleic Acid)
What is a nucleotide?
1. Sugar (5 carbon)2. Phosphate group 3. Nitrogenous base (there are four
bases) Cytosine C Thymine T
Adenine A Guanine G
Each base has a compliment. That means that it normally bonds with another base.
For example: A always bonds with T
C always bonds with G
Phosphate group
Nitrogenous base
nucleotide
5 carbon sugar
Hydrogen bond
A T
T A
C G
G C
Let’s Practice
T-C-G-A-A-T-T-G-C-C-
C-G-T-C-T-A-A-T-G-G-C-T-
GCAGATTACCGA
AGCTTAACGG
Original Strand
Complimentary Strand
Chromosome Number
DNA
Transcription Translation
TraitRNA Protein
RNA processing
Making Proteins
Step 1: DNA replication Step 2: RNA synthesis (Using a piece of
DNA to make RNA, called transcription) Step 3: Amino acids form proteins (called
translation)
DNA RNA Protein
Is single-stranded Contains the sugar ribose Has the base U (uracil) instead of T (thymine) There are 3 types:
mRNA – messenger RNArRNA – ribosomal RNAtRNA – transfer RNA
RNA
Making a protein from the plans in the DNA is a two step process.
Transcription:
A messenger RNA copy of the gene is made.
Translation:
The mRNA is sent to a ribosome where a protein is made.