CHAPTER 7 CELL STRUCTURE & FUNCTION PGS. 168 - 199 CELL STRUCTURE & FUNCTION.
Cell Structure and Function
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Transcript of Cell Structure and Function
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CELL STRUCTURE
AND FUNCTIONChapter 4 Notes
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ROBERT HOOKE
First to observe cells 1665 Tree, Roots, Stems, Ferns, Cork “Tiny Boxes”
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ANTON VAN LEEUWENHOEK
First to observe living cells 1673 Spirogyra & Vorticella
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HOW BIG ARE THEY?
Utah.edu Site
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CELL THEORY All living organisms are composed of
one or more cells. Cells are the basic unit of structure and
function in an organism. Cells come only from the reproduction of
existing cells.
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CELL SHAPE
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BASIC PARTS OF THE CELL Plasma membrane
Acts as a barrier – Materials enter and exit through the membrane
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BASIC PARTS OF THE CELL
Inside
Outside
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BASIC PARTS OF A CELL Plasma Membrane
AKA: Phospholipid Bilayer
Hydrophobic / Hydrophilic
Proteins
Carbohydrates
Markers
Channels
Receptors
FLUID MOSAIC MODEL
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BASIC PARTS OF THE CELL Cytoplasm
-Region inside theMembrane
Cytosol – the liquid and cytoskeleton
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BASIC PARTS OF THE CELL Control Center
Nucleus/Nucleiod
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TYPES OF CELLS Prokaryote Lacks nucleus – Still has DNA Includes Bacteria and Achaea Kingdoms No membrane bound organelles Simple, Smaller
Eukaryote True nucleus – DNA bound by 2 membranes Includes Plant, Animal and Fungi Kingdoms Membrane bound organelles Complex, Larger
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TYPES OF CELLS Prokaryote Lacks nucleus – Still has DNA Includes Bacteria and Achaea Kingdoms No membrane bound organelles Simple, Smaller
Eukaryote True nucleus – DNA bound by 2 membranes Includes Plant, Animal and Fungi Kingdoms Membrane bound organelles Complex, Larger
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TYPES OF CELLS
BACTERI
A
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TYPES OF CELLS
PLANT
S
ANIMALS
PROTISTS
FUNGI
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CELL SIZE Size is limited by surface area-to-volume ratio As a cell grows, its volume increases faster than its surface area.
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BACTERIA AND VIRUSES ARE SMALL AND SIMPLE How do you get big, and therefore open
up the possibility of becoming more complex and capable of doing more?
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CELL SIZE
Surface Area = 1m X 1m X 6 sides = 6 m2 Surface Area = .5m X .5m X 6 sides X 8 cubes = 12 m2
Volume = 1m X 1m X 1 sides = 1m3 Volume = 1m X 1m X 1m = 1 m3
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CELLULAR ORGANIZATION Colonial Organism vs. True Multicellularity
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CELLULAR ORGANIZATION Colonial Organism vs. True Multicellularity Colonial: Organisms that live in a colony live in a
connected group but few activities are coordinated.
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CELLULAR ORGANIZATION Colonial Organism vs. True Multicellularity Colonial: Organisms that live in a colony live in a connected group but few activities are
coordinated.
True Multicellular organisms have organization detailed below: Cell – Tissue – Organ – Organ System
Tissue = Group of cells that similar cells that carry out a specific function
Organ = Groups of tissue that perform a specific job Organ Systems = Groups of organs that accomplish related
tasks
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CELLULAR ORGANIZATION
The smallest unit of life
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CELLULAR ORGANIZATION
Some animals don’t even have
organs
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CELLULAR ORGANIZATION
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Bacteria & Viruses
A QUICK DETOURCHAPTER 23 & 24
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A BIT OF CONFUSION…The things that make us ill..
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A BIT OF CONFUSION…The things that make us ill could
be be…
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BACTERIA ARE PROKARYOTES
Single celled organisms that do not have a membrane bound
nucleus
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BACTERIAL ANATOMY
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BACTERIAL REPRODUCTION & RECOMBINATION
Binary Fission
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BACTERIAL REPRODUCTION & RECOMBINATION
Transformation
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BACTERIAL REPRODUCTION & RECOMBINATION
Transduction
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BACTERIAL REPRODUCTION & RECOMBINATION
Conjugation
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NUTRITION & HABITAT
Obligate AnaerobeFacultative Anaerobe
Obligate Aerobe
HeterotrophAutotroph
“Photo” means uses light energy“Chemo” means extract energy from inorganic compounds
Must live O2 free
Can do with or without O2
Must have O2
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Obligate Anaerobe
Facultative Anaerobe
Obligate Aerobe
2
1
3
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IDENTIFYING BACTERIA
Shape/Growth Pattern
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IDENTIFYING BACTERIA
Shape/Growth Pattern
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IDENTIFYING BACTERIA
Gram Staining:Gram + have a petidoglycan rich cell wallGram – bacteria have a complex cell wall
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Gram +
Gram –
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RECALL…
The characteristics of living things:Organization
Response to StimuliHomeostasisMetabolism
Growth and DevelopmentReproduction
Change through time (evolve)
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VIRUSES ARE NOT LIVING
They do NOT have cytoplasm or organelles and do NOT carry out metabolism or homeostasisThey DO have genetic information and DO reproduce (they just require a host cell to do so)
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VIRUS ANATOMY
Nucleic Acid
Nucleic Acid
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VIRUS ANATOMY
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VIRAL REPLICATION
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INFECTION!
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INFECTION!
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INFECTION!
Source:
-Influenza Virus
- Spread by direct transmission (when an infected person sneezes mucus directly into the eyes, nose or mouth of another person); airborne route (when someone inhales the aerosols produced by an infected person coughing, sneezing or spitting) and through hand-to-eye, hand-to-nose, or hand-to-mouth transmission, either from contaminated surfaces or from direct personal contact such as a hand-shake.
“The Flu”
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INFECTION!
Source:
-Rhinovirus
-most common type of virus
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INFECTION!
Source:
-Herpes Simplex Virus
-Transmitted by contact
(of infected area)
Symptoms:-Visible sores -Some infections can be permanent, with occasional outbreaks for life
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INFECTION!
Source:
-Herpes Simplex Virus
-Transmitted by contact
(of infected area)
Symptoms:-Visible sores -Some infections can be permanent, with occasional outbreaks for life
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INFECTION!
Source:
-B. Anthracis/Spores
- Symptoms:-Visible sores -Can infect skin, Gastrointestinal tract And respiratory tract
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INFECTION!
Source:
-B. Anthracis/Spores
- Symptoms:-Visible sores -Can infect skin, Gastrointestinal tract And respiratory tract
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INFECTION!
Source:
-Ebola VirusSymptoms:
-Fever, chills , vomiting(flu-like symptoms)
-Agitation, confusion
-Edema
-Hemorrhagic fever
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INFECTION!
Source:
-HIV Virus
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INFECTION!
Source:
-Salmnella or E.Coli in undercooked/contaminated food
“Food Poisoning”
Symptoms:
-Fever, chills , diarrhea, vomiting(flu-like symptoms)
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INFECTION!
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INFECTION!
Source:
-often caused by one of group b streptococcus
Symptoms:
-Flu like symptoms followed by serious issues related to swelling in the brain
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INFECTION!
Source:
-Streptococcus pyogenes
(a group a streptococcus)
Symptoms:
-Flesh eating bacteria
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INFECTION!
Source:
- Staphylococcus Aureus
Symptoms:
-Sores
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INFECTION!
Source:
- Staphylococcus Aureus
Symptoms:
-Sores
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INFECTION!
Source:
- Neisseria gonorrhoeae
Symptoms:
-Wart like sores that ooze puss
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OK, BACK TO THE COMPLEX CELLS THAT CAN BUILD MULTICELLULAR ORGANISMS.
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CELL ORGANELLES Nucleus DNA is like a reference book. It DOES NOT
leave the nucleus
DNA controls PROTEIN SYNTHESIS
therefore controls the cell
Nuclear Envelope – 2 Layers
Nuclear Pores
Nucleolus
DNA – Chromatin - Chromosomes
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CELL ORGANELLES MitochondriaTransfer energy from organic molecules
to ATP
Site of CELLULAR RESPIRATION
Mitochondrial DNA
You’ve got lots of these….they make energy!
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CELL ORGANELLES Ribosomes
Smallest, most numerous organelle
Free floating, in Nucleus, on E.R.
Site of PROTEIN SYNTHESIS
You’ve got lots of these…they make protein!
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CELL ORGANELLES Endoplasmic Reticulum
Cistern
Rough – Has ribosomes on it
Smooth – No ribosomes
Vesicles pinch off for exporting materials.
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E.R. CONTINUED… Rough ER– Produces phospholipidsand proteins. These products are later used or exported.
EX: digestive enzymes Smooth ER – Produces lipids like Steroids (testosterone, estrogen) and Cholesterol. Helps detoxify drugs and poisons.
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CELL ORGANELLES Golgi ApparatusReceive and modify products of the E.R.
Package for export out of cell
Can label or add carbs to proteins
or alter lipids
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CELL ORGANELLES Vesicles
Lysosomes Bud off of GA – Contain digestive enzymes Autophagy – Digestion of worn out organelles
Peroxisomes Abundant in liver and kidney cells Neutralize free radicals H2O2 – Produced when breaking down alcohol
and killing bacteriaOther Vesicles
Endosome (from engulfing something) Glyoxysomes (break down stored energy in plant
seeds)
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CYTOSKELETON Microtubules
Hollow tubes of tubulin (a protein) that radiate from the centrosome
Help maintain shape of cell, aid in organelle movement (act as tracks)
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CYTOSKELETON Microfilaments
Long threads of actin (a protein)Contraction leads to cell movement
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CYTOSKELETON Intermediate Filaments
Rods that anchor the nucleus and some other organelles in their place
Maintain cell and nucleus shape
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CYTOSKELETON Cilia and Flagella
Hair like structures that extend from cell surface Cilia – Short and numerous Flagella – Much longer (not as many) They have a membrane on the outer surface and nine pairs of
microtubules around two central tubules.
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CYTOSKELETON Centrioles
Two short microtubule cylinders Organize microtubules and cytoskeleton
during cell division in animal cells
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CYTOSKELETON
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COMPARING CELLS Animal Cell
eukaryoticmembrane bound organelles true nucleus
Plant
everything an animal cell has &…cell wall large central vacuoleplastids
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PLANT CELLS Cell Wall
Rigid layer outside plasma membrane Contains cellulose (a carbohydrate)Some plants produce secondary cell walls
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PLANT CELLS Central Vacuole
Large, fluid-filled organelle that stores water (and enzymes, waste and other materials)
Up to 90% of cells volume
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PLANT CELLS Chloroplasts
Site of PhotosynthesisThylakoids (membrane sacs) contain
Chlorophyll (a pigment)Contain their own DNA
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PLANT CELLS Chromoplasts
Contain colorful pigments that may or may not help photosynthesis
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WHERE DID ORGANELLES COME FROM?
http://www.sumanasinc.com/webcontent/animations/content/organelles.html
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A COOL VIDEO Inner Lifehttp://multimedia.mcb.harvard.edu/media.hml
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HOW CAN WE OBSERVE CELLS? Microscopes!
Ocular Objective
Arm
Stage
Base
Stage Clips
Light Source
Nose Piece
Low Power Objective
Medium Power Objective
High Power Objective
Diaphragm
Coarse Adjustment
KnobFine Adjustment
Knob