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Chapter 7.2
Eukaryotic Cell Structure
Goal 1:
Describe the structures and
function of the cell nucleus
• Nuclear Envelope
• Surrounds nuclear contents
• Phospholipid bilayer membrane
• Nuclear pores regulate molecule movement
• Proteins
• RNA
7.1 7.2 powepoint cells 2010
7.1 7.2 powepoint cells 2010
TEM
picture
• Chromatin
• DNA bound to
proteins
• Stores genetic
material
• Loosely floating
• Chromosomes
• Condensed
chromatin
• Cell division
• Contains DNA =
genetic material
• Nucleolus
• Small dense region
• Ribosome
assembly
• Summary of Nucleic Functions
• Access to nucleic materials regulated
• Contains genetic material as DNA
• DNA prepared for cell division
• First step in ribosome formation
Goal 2
Describe the structures and
functions of the major cell
organelles
• Ribosomes
• RNA and protein
• Rough
endoplasmic
reticulum
• Build protein chains
• Endoplasmic Reticulum
• Near the nucleus
• Ribosomes assemble proteins here
RER
• Lipids assembled on SER
• Toxins are detoxified
7.1 7.2 powepoint cells 2010
7.1 7.2 powepoint cells 2010
• Golgi Apparatus
• Closely stacked membranes
• Modify, sort, package proteins and
lipids
• Stores
• Transports for secretion
7.1 7.2 powepoint cells 2010
• Lysosomes
• Small enzyme filled sac
• Breaks down biomolecules & organelles
• Tay-Sach’s disease
http://www.flickr.com/photos/exothermic/2611995050/in/set-72157605406260833/
lysosomes
7.1 7.2 powepoint cells 2010
• Vacuole
• Used for storage
• Water , salts, proteins, carbohydrates
• Central vacuole in plants
• Contractile vacuole in paramecium
Contractile vacuoleContractile vacuoleCentral vacuoleCentral vacuole
• Mitochondria
• Chemical energy conversion
• Organelle with own double
membrane
• Human mitochondria passed on by
maternal ovum
• Contains own DNA
7.1 7.2 powepoint cells 2010
• Chloroplasts
• Photosynthesis
• Stacks of green membranes
• Convert suns energy into chemical energy
• Contains own DNA
7.1 7.2 powepoint cells 2010
7.1 7.2 powepoint cells 2010
Goal 3
Identify the main roles of the
cytoskeleton
• Cytoskeleton
• Protein filaments
• Maintains cell
shape
• Cell movement
• Centrioles
• Only in animal cells
• Organizes cell parts during cell division
7.1 7.2 powepoint cells 2010
• Microfilaments
• Thread-like, made of Actin
• Provides flexible support and movement
• Microtubules
• Hollow tubes made of tubulin
• Provides support
• Cell division
• Cilia and flagella for cell movement
Cilia & Flagella

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7.1 7.2 powepoint cells 2010

Notes de l'éditeur

  1. Nuclear pore complex … largest protein complex in cell …
  2. TEM (transmission electron microscopy) picture taken in 1976
  3. Protectors of genetic info during cell division
  4. Ganglioside a lipid molecule that does not get broken down… build up of this lipid damages brain and nerve cells resulting in loss of functions (blind, deaf, unable to swallow) and eventual death, usually by age 4
  5. These are the notes that Exothermic added to this picture: “These progesterone treated CHO cells have been stained with Acridine Orange and are viewed through a phase contrast microscope. Acridine Orange is a vital stain and as such must be used on a living cell since metobolic activity is critial to the function of the stain. Upon entering organelles with a low pH such as lysosomes, Acridine Orange becomes protonated and appears orange when viewed under specific light wavelenths. In the nucleus, Acridine Orange attaches to DNA and appears green.Within seconds after these cells are exposed to the wavelenth of light that excites Acridine Orange the lysosomes would often burst, presenting us with a spectacular display. ”