A Tour of the Cell Microscopic view Membrane structure Nucleus and ribosomes The Endomembrane System...
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A Tour of the Cell
Microscopic view
Membrane structure
Nucleus and ribosomes
The Endomembrane System
Chloroplasts, Mitochondria
Cytoskeleton
Cilia and flagella
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A Prokaryote
Measured in microns ~ 0.5 m
Example? Bacteria
Name some structures:
Flagella
Pili
Ribosomes (blue ‘dots’)
Capsule
Cell wall
Plasma membrane
orange
green
yellow
Nucleoid region (DNA)
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Functions?1. Surface appendages that allow a bacterium to stick to a surface
2. Where are proteins synthesized?
3. The sticky, jellylike protective layer outside the cell wall
4. The rigid structure that surrounds, supports, and protects the cell
5. Which structure is a selective barrier, allows passage of oxygen, nutrients, and wastes?
6. Where is the cell's DNA, containing the genes that control the cell
7. The structure that propels the cell
Flagella
Plasma membrane
Ribosomes
Pili
Cell wall
Capsule
Nucleoid region
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Compare cells
1. Which is the animal cell?
2. Which is the plant cell?
3. Which is characteristic of bacteria?
4. Which does not have a nucleus?
5. Which does not have a cell wall?
6. Which does not have organelles?
A
B
C
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Eukaryotic cells Plasma membrane
Nucleus
Ribosomes
Endoplasmic Reticulum (rough, smooth)
Cytoskeleton
The Golgi Apparatus
Lysosomes
Mitochondria
DNA
Cilia, flagella
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Plasma membraneSeparates living cells from nonliving surroundings
It is known as? the fluid mosaic model
Cholesterol
Lipid bilayer
Cytoskeleton Protein Cytoplasm
Extracellular fluid
Carb
Glycoprotein
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Phospholipid bilayer
Hydrophilic ‘head’
Hydrophilic ‘tails’
Hydrophilic ‘head’
Extracellular fluid
Cytoplasm
?
?
?What is the function of this component?
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Learning check
Which best describes the structure of the plasma membrane?
a. Proteins sandwiched between 2 layers of phospholipid
b. Proteins embedded in 2 layers of phospholipid
c. A layer of protein coating a layer of phospholipid
d. Phospholipids embedded in 2 layers of protein
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The Nucleus Is the ‘manager’ of the cell
What does it contain? • DNA
(Chromatin; chromosomes)
• Nucleolus (Produces parts of ribosomes)
It is bordered by a double membrane
& has pores
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What is chromatin?
Long DNA molecules + protein(forms long fibers)
What is the nucleolus?
Ball like mass(of fibers and granules)
Produces part of ribosomes(blue ‘dot’)
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What are ribosomes?Organelles responsible for protein synthesis
Where do they go?Move from nucleus to cytoplasm
Why?Protein synthesis occurs in the cytoplasm
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Recall protein synthesis?(cf last talk on molecules of life)
DNA
Transfers information
To mRNA
Leaves nucleus
Travels to cytoplasm
Binds to ribosome
Protein synthesized
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Learning checkIn eukaryotic cells, the first step in protein synthesis is the ____.
a. translation of an RNA nucleotide sequence into a sequence of amino acids
b. linking of nucleotides to form a polypeptide
c. translation of a DNA nucleotide sequence into a sequence of amino acids
d. transferring of information from DNA to messenger RNA
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Endoplasmic reticulum
RER: Makes membrane and secretory proteins
SER: lipid synthesis and detoxification
SER
RERwith
ribosomes
Nuclearmembrane
(blue ‘dots’)
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Secretory proteinsAfter the RER synthesizes a molecule, it packages the molecule into transport vesicles
Example?
Saliva with enzymes
Ribosome with
peptide chain
Secretory vesicle
Buds off
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SER
• No ribosomes
Structure?
• But, membrane has many enzymes
What are some of the enzyme functions?
Ovaries, testes: Sex hormones enriched
Liver cells: Detoxification of drugs
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Learning check
Proteins destined for secretion are made on _____ bound to the _____.
a. lysosomes ... Golgi apparatus
b. ribosomes ... Golgi apparatus
c. ribosomes ... mitochondria
d. mitochondria ... endoplasmic reticulum
e. ribosomes ... endoplasmic reticulum
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The Golgi ApparatusRefines ER products and packages
And packages them in transport vesicles
transport to organelles
Flattened sacs
vesicles ‘become’ lysosomes
export from cells
What do transport vesicles do?
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Lysosomes Membrane enclosed sac of digestive enzymes
• Food
What do they break down?
• Damaged organelles
Proteins, polysaccharides, fats, nucleic acids
Mitochondria
Lysosome
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Learning check
Lysosomes can form by budding directly off _____.
a. the Golgi apparatus
b. the endoplasmic reticulum
c. mitochondria
d. chloroplasts
e. the nucleus
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1.
2.
3.
4.
The Endomembrane
System
Transport of ?
Digestive ?
Storage ?
Secreted ?
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Chloroplasts & Mitochondria
Think energy!
Site of photosynthesis
Site of cell respiration
Conversion of light (energy) to chemical energy
More to come in Chapter 7
Produces ATP (energy) from food molecules
More to come in Chapter 6
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Cytoskeleton Its like an infrastructure:
‘Skeleton’ ‘Muscles’
What is it made up of?
Its a network of fibers(microtubules, filaments)
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Microtubules Are straight, hollow tubes
What are they composed of?Globular proteins Tubulin
What are some functions?
• Anchor organelles• Move organelles• Guide movement
of chromosomes• Crawling motion
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• Rapid degeneration and rebuilding of microtubules
Crawling motion?
• Allows ‘crawling’ movement like the
amoeba
• And some of our white blood cells
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Cilia and flagellaare motile appendages
How do cilia move?• In a coordinated back-and-forth way
Paramecium
Example?
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How do flagella move?
• In a whip-like motion
Sperm
Example?
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What happens in our respiratory tract?
The human windpipe is lined with cilia on non-motile cells
Function to move fluid over the surface of the tissue
Sweep mucus with trapped debris out of lungs
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Learning check
Which one of the following statements about cilia and flagella is true?
a. Cilia and flagella are typically found just inside a cell membrane.
b. Cilia are typically much longer than flagella.
c. Flagella and cilia assist in moving a cell or the cell's surroundings.
d. The inside of flagella and cilia consists of many rows of actin and myosin filaments.
e. Cilia are only found in animals.
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Which of these organelles is found within the nucleus?
a. nucleolus b. mitochondrion c. SER d. chloroplast e. ribosome
Which of these organelles carries out cellular respiration?
a. nucleolus b. chromatin c. SER d. mitochondrion e. ribosome
Which organelle plays a role in intracellular digestion?
a. Lysosome b. ribosome c. chloroplast d. Golgi apparatus
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Concept CheckThe three domains of life described by biologists today include the bacteria, the archaea and the eukarya (all other forms of life).
A. The prokaryotes do not have a plasma membrane surrounding the cell.
B. The prokaryotes use RNA and not DNA to pass on the genetic message.
C. The eukaryotes have the interior of the cell divided by internal membranes into specialized compartments.
D. The eukaryotes engage in cellular metabolism while the prokaryotes do not.