today’s data here
DESCRIPTION
Today’s Data Here. Objective Here!. Brainteaser. I am the beginning of sorrow, and the end of sickness. You cannot express happiness without me, yet I am in the midst of crosses. I am always in risk, yet never in danger. You may find me in the sun, but I am never seen out of darkness. - PowerPoint PPT PresentationTRANSCRIPT
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Today’s Data Here
• Objective Here!
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Brainteaser
• I am the beginning of sorrow, and the end of sickness. You cannot express happiness without me, yet I am in the midst of crosses. I am always in risk, yet never in danger. You may find me in the sun, but I am never seen out of darkness.
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Bell Work
• The process by which organisms keep their internal conditions fairly constant is calledA. homeostasis.
B. metabolism.
C. evolution.
D. photosynthesis.
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Let’s Review
• What are the characteristics of living things?
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Cell Structure & Function
http://koning.ecsu.ctstateu.edu/cell/cell.html
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Who saw them first?
• Robert Hooke in 1665, was the first person to use the word "cell" to identify microscopic structures when he was describing cork.
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Who built the first microscope?
• Anton Van Leeuwenhoek - Father of Microbiology
• made over 500 "microscopes," of which fewer than ten have survived to the present day.
• First to record microscopic observations of muscle fibers, bacteria, spermatozoa and blood flow in capillaries
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Background
• Matthias Schleiden ( 1830’s) All plants are composed of cells.
• Theodor Schwann (1831) All animals are made of cells.
• Rudolf Virchow (1858) - Found that • every cell comes from a pre-existing cell.
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Cell Theory
• All organism are made up of cells
• A cell is the structural and functional unit of organs and ultimately, organisms.
• Cells are capable of self – reproduction and cells come only from pre-existing cells
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What is a Cell
A cell is the smallest unit that is capable of performing life
functions.
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Two Types of Cells
Prokaryotic Eukaryotic
NucleusNo nucleus
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Examples of Prokaryotic Cells
Salmonella
E. Coli
Meningitis
Sprillum volutans
Bacillus or rod shape
Sprillum or spiral shape
Coccus or circle shape
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Prokaryotic/Bacterial Cell
• Do not have structures surrounded by membranes
• Few internal structures
• One-celled organisms, Bacteria
http://library.thinkquest.org/C004535/prokaryotic_cells.html
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Parts of the Prokaryotic Cell
• Flagellum – move the bacterium in a fluid medium • Cytoplasm – a semifluid medium that make up the
majority of the cell• Ribosomes – synthesis of proteins• Nucleiod – where the DNA is located• Capsule – gelationous sheath called a slime layer
that surrounds the cell wall• Cell Well – gives the cell its shape• Plasma Membrane – regulates the movement of
molecules into and out of the cytoplasm.• Plasmid – external single DNA molecule
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Flagellum and Pili
• Very thin appendages that rotate like propellers to move the cell
• Pili allows the bacteria to stick to other bacteria and surfaces
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Cytoplasm• This gel matrix is also
known as protoplasm, and consists of water, enzymes, nutrients, wastes, gases and cell structures. It is the location of growth, metabolism, and replication.
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Ribosomes
• synthesis of proteins
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Nucleiod
• where the DNA is located
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Capsule
• a slime layer that surrounds the cell wall
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Cell Wall• gives the cell its shape
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Plasma Membrane
• Controls the movement of materials into and out of the cell.
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Let’s Practice!
• http://foxbiology.com/ib_review/cells/prokaryotic/intro.html
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The whip-like structure on this organism is MOST LIKELY
A. excreted waste products.
B. an organelle for absorbing food.
C. used for locomotion.
D. an adaptation for defense.