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1. 2 THE DISCOVERY OF THE CELL It was not until the mid-1600’s that scientists began to use...

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Page 1: 1. 2 THE DISCOVERY OF THE CELL It was not until the mid-1600’s that scientists began to use microscopes to observe cells. In 1665, Englishman Robert Hooke.

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Page 2: 1. 2 THE DISCOVERY OF THE CELL It was not until the mid-1600’s that scientists began to use microscopes to observe cells. In 1665, Englishman Robert Hooke.

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THE DISCOVERY OF THE CELL

• It was not until the mid-1600’s that scientists began to use microscopes to observe cells.

• In 1665, Englishman Robert Hooke used an early compound microscope to look at a slice of cork, plant material.

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CORK CELLS

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• Hooke saw thousands of empty chambers which he called cells. They reminded him of a monastery’s tiny rooms, which were called cells.

• In Holland around the same time, Anton van Leeuwenhoek used a single-lens microscope to observe pond water and other things.

• He discovered that living things seemed to be everywhere, even in the water he was drinking.

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Paramecium

Spirogyra

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THE CELL THEORY

• In 1838, German botanist Matthias Schleiden concluded that all plants were made of cells.

• In 1839, German biologist Theodor Schwann stated that all animals were made of cells.

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• In 1855, German physician Rudolf Virchow concluded that new cells could be produced only from the division of existing cells.

• These discoveries, confirmed by other biologist, are summarized in the cell theory.

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• CELL THEORY STATES…

1. All living things are composed of cells.

2. Cells are the basic units of structure and function in living things.

3. New cells are produced from existing cells.

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THE CHANGE OF THE MICROSCOPE

• Hooke, Virchow, and others used crude microscopes to study the cells.

• Today scientist can use a variety of different techniques.

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• High resolution video to make movies of cells as they grow.

• Transmission electron microscope –electrons pass through thin slices of

cell parts

–Cells must be dead and in a vacuum

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CONFOCAL LIGHT

TEM

TEM

CHLOROPLAST

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• Scanning electron microscope–produces three-dimensional images

of cells

–Do not have to cut cells into slices

–Vacuum

TEM is more powerful than SEM

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MARINE DIATOMSEM

pea weevil egg

SCANNIING ELECTRON

MICROSCOPE

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White pine sheath mite on eastern white pine

Scanning electron microscope image of white pine sheath mite

http://allegheny.extension.psu.edu/IPM/Insects/WhitePineSheathMite/PineEriophyidMite.jpg
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24Sheet metal as seen with an SEM

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PROKARYOTES and EUKARYOTES

• Cells fall into two categories, depending on whether they contain a nucleus.

1. Eukaryotes (YOUkaryotes)- have a nucleus.

2. Prokaryotes (Pro=NO)- no nucleus.

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PROKARYOTIC CHARACTERISTICS

• Smaller than eukaryotic cells• Genetic information is not contained by a

nuclear membrane

• NO internal membranes

• Less complex compared to eukaryotic cells

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• Some glide and swim through liquids.

• Forms of locomotion are: • Cilia – hair like structures

• Flagella – whip like structure.

-------

Example of Prokaryotes: Bacteria

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EUKARYOTIC CHARACTERISTICS

• Larger than prokaryotes

• They usually contain dozens of structures and internal membranes = organelles

• Genetic info is carried by a nucleus.

• Some live solitary lives while other form large multicellular organisms.

• Examples: plants, animals, fungi, and protist.

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PARTS OF THE CELL

• Cell biologists divide eukaryotic cell into two parts: the nucleus and the cytoplasm.

• The cytoplasm is the portion of the cell that is outside the nucleus. (includes the organelles)

• Cytosol = is the internal fluid of the cell, and a large part of cell metabolism occurs here

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THE NUCLEUS• The nucleus is the control center

of the cell.

• It contains the cell’s DNA and the code for making proteins and other important molecules.

• The nucleus is surrounded by a nuclear envelope composed of two membranes.

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• The envelope is dotted with thousands of pores, which allow materials to leave the nucleus to other parts of the cell.

• Inside of the nucleus is a granular material called chromatin.

• Chromatin consists of DNA bound to protein (histones).

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Structure of DNA

• http://www.johnkyrk.com/chromosomestructure.html

http://www.johnkyrk.com/chromosomestructure.html
http://www.johnkyrk.com/chromosomestructure.html
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• When a cell divides, the chromatin condenses to form chromosomes.

• These are the distinct structures that are passed from cell to cell…generation to generation.

• Deep inside the nucleus is the nucleolus which is where assembly of ribosomes begins.

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? QUESTION ?

• WHAT KIND OF INFORMATION IS CONTAINED IN CHROMOSOMES ?

• ANSWER: Genetic Information known as DNA

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RIBOSOMES

• One of the most important jobs carried out in the cell is making proteins.

• Proteins are assembled in ribosomes.

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• Ribosomes are small particles of RNA and protein found throughout the cell (mostly cytoplasm).

• Ribosomes produce proteins by following coded instructions that come from the nucleus.

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? QUESTION ?

• WHAT DO RIBOSOMES PRODUCE ?

• ANSWER: PROTEINS

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ENDOPLASMIC RETICULUM

• The endoplasmic reticulum also known as ER. It is the site where lipid components of the cell membrane are assembled, along with proteins and other materials.

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• The portion of the ER involved in synthesis of proteins is called Rough ER.

• Rough ER = ribosomes found on the surface.

• Newly made proteins leave ribosomes and are inserted into the Rough ER, where they can be chemically modified.

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• There are other portions of the ER called Smooth ER because no ribosomes are embedded.

• Smooth ER contains enzymes that synthesize lipids and the detoxification of drugs. (liver cells contain a lot of Smooth ER)

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? QUESTION ?

• WHAT IS THE ROLE OF THE Rough ER ?

• ANSWER: to synthesize proteins & chemically modify them

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GOLGI APPARATUS

• The Golgi Apparatus receives proteins from the Rough ER.

• The job of the Golgi Apparatus is to modify, sort, and package proteins for storage or secretion outside the cell.

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• The Golgi Apparatus is like a customizing shop that puts on the final touches before proteins are shipped out.

• It is also like the UPS of the cell. It doesn’t make anything, but it sorts and packages items.

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Golgi Animation

• http://www.johnkyrk.com/golgiAlone.html

http://www.johnkyrk.com/golgiAlone.html
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? QUESTION ?

• WHAT IS THE ROLE OF THE GOLGI APPARATUS ?

• ANSWER: It modifies, sorts, and packages proteins, lipids, and other materials/chemicals.

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VACUOLES

• Vacuoles are saclike structures that store materials such as water, salts, proteins, and carbohydrates in all organisms.

• Plant cells have vacuoles. They help each cell maintain water pressure to hold up heavy structures such as leaves and flowers.

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• Some single-celled organisms & plants have contractile vacuoles which regulates the water inside the cell.

• Contractile vacuoles help cells maintain Homeostasis or “internal balance”

• Central Vacuole = holds water and waste materials for plants

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http://rds.yahoo.com/S=96062883/K=VACUOLE/v=2/SID=e/l=IVI/SIG=13jhfg779/*-http://www.khsd.k12.ca.us/liberty/geivet/Cell%20Structure_files/Cell%20Structure1_files/slide0011_image017.jpg
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? QUESTION ?

• WHAT IS THE ROLE OF A VACUOLE ?

• ANSWER: They store materials and help plants maintain their structure

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LYSOSOMES

• Lysosomes are the clean up crew of the cell.

• They are small organelles filled with enzymes that break down and digest lipids, carbohydrates, and proteins.

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? QUESTION ?

• WHAT IS THE ROLE OF THE LYSOSOME ?

• ANSWER: clean up the cell and get rid of material & breaks down lipids, carbohydrates, and proteins

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CELLS AND THEIR POWER

• Nearly all eukaryotic cells, including plants contain Mitochondria.

• Mitochondria are organelles that convert the chemical energy stored in food into compounds that are more convenient.

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• In humans, all or nearly all our mitochondria come from the cytoplasm of the ovum, or egg cell.

• In plants, chloroplasts are the organelles that capture the energy from the sunlight and convert it into chemical energy in a process called photosynthesis.

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• Both mitochondria and chloroplast are the only organelles that have small DNA molecules.

• Scientist have evidence that these two organelles may have been descendants of ancient prokaryotes at one time.

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CYTOSKELETON

• The cytoskeleton is a network of protein filaments that help the cell maintain its shape.

• Microfilaments and Microtubules make up the cytoskeleton.

• Microfilaments are threadlike made of a protein called actin.

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• Microtubules are hollow structures that are made up of proteins called tubulins.

• In animal cells, tubulin helps in the development of centrioles.

• Centrioles are located near the nucleus and help in cell division.

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• Cell membrane = phospholipid double layer with protein, carbohydrates, and other molecules embedded.

• Cell wall (plants, fungus, and some protists) = tough outer covering –Plants – made of cellulose–Fungus – made of chitin

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Cells - stambrosesciencejr.weebly.comstambrosesciencejr.weebly.com/uploads/9/1/9/9/9199176/cells.pdf · THE MICROSCOPIC CELL • Cells were first observed by Robert Hooke in 1665

Cells - stambrosesciencejr.weebly.comstambrosesciencejr.weebly.com/uploads/9/1/9/9/9199176/cells.pdf · THE MICROSCOPIC CELL • Cells were first observed by Robert Hooke in 1665

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16 MICROBIOLOGÍA: HISTORIA ETAPA DESCRIPTIVA: S. XVII-XIX HOOKE:1665 Micrographia-Microscopios LEEUWENHOEK: 1679 BACTERIAS Y MICROSCOPIOS SEMMELWEIS: 1850:

16 MICROBIOLOGÍA: HISTORIA ETAPA DESCRIPTIVA: S. XVII-XIX HOOKE:1665 Micrographia-Microscopios LEEUWENHOEK: 1679 BACTERIAS Y MICROSCOPIOS SEMMELWEIS: 1850:

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A Tour of the Cell (Chapter 6). The Discovery of the Cell: Hooke In 1665, Robert Hooke used an early compound microscope to look at a thin slice of cork,

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Three-dimensional schlieren measurements using inverse ...bsuther/papers/3dinv/reprint.pdf · techniques discovered 300 years ago by Hooke (1665) include interferometry, shadowgraph

Three-dimensional schlieren measurements using inverse ...bsuther/papers/3dinv/reprint.pdf · techniques discovered 300 years ago by Hooke (1665) include interferometry, shadowgraph

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