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Earth and Life Science
Chapter 10
You're invited...
Objectives:
When you complete this chapter, you should be able
to:
•Examine the principles of cell theory.
•Describe the components of cell using a diagram.
•Identify the components of the endomembrane system in a eukaryotic cell.
•Examine the importance of the endomembrane system in a eukaryotic cell.
•Examine the components of a cytoskeleton using diagrams and examples.
•Describe the characteristics and functions of the extracellular matrix in a
cell sing an example.
•Examine the properties that are unique to living organisms.
•Examine the laws of thermodynamics.
•Examine the importance of energy to all living organisms.
•Examine the characteristics of sunlight.
•Examine how the wavelength of light affects photosynthesis.
•Examine the role of pigments in photosynthesis.
•Describe the process of photosynthesis using a flowchart.
•Examine the different methods used by photosynthetic organisms to fix
carbon.
You're invited...
What is a Cell?
 The cell is the basic unit of structure and function
in living things. Cells vary in their shape size,
and arrangements but all cells have similar
components, each with a particular function.
 Some of the 100 trillion of cells make up human
body.
 All human cell are microscopic in size, shape and
function.
 The diameter range from 7.5 micrometer (RBC)
to 150 mm (ovum).
You're invited...
What is a Cell?
- Cell is defined as the fundamental living unit of any
organism.
- Cell is important to produce energy for metabolism
(all chemical reactions within a cell)
- Cell can mutate (change genetically) as a result of
accidental changes in its genetic material (DNA).
- Cytology: the study of the structure and functions of
cells.
You're invited...
Cell History
Cytology- study of cells
 Used a microscope to examine cork
(plant)
 Hooke called what he saw "Cells“
 He described the cells as tiny boxes or a
honeycomb
 He thought that cells only existed in
plants and fungi
1665 – Robert Hooke
Cork Cells
You're invited...
Cell History
1673- Anton van Leeuwenhoek
 1673- Used a handmade microscope to
observe pond scum & discovered single-
celled organisms
 He called them “animalcules”
 He also observed blood cells from fish,
birds, frogs, dogs, and humans
 Therefore, it was known that cells are
found in animals as well as plants
You're invited...
Cell History
1838 - Matthias Schleiden
A botanist who
concluded that all plants
are made of cells.
Typical Plant Cell
You're invited...
Cell History
1839 - Theodor Schwann
A zoologist who
concluded that all
animals are made of
cells.
Nerve Cells
You're invited...
Cell History
1858 - Rudolph Virchow
1858- Rudolf Virchow,
German physician, after
extensive study of cellular
pathology, concluded that cells
must arise from preexisting
cells.
You're invited...
Cell Theory
The COMBINED work
of Schleiden,
Schwann, and
Virchow make up
the modern CELL
THEORY.
You're invited...
Cell Theory
The 3 Basic Components of the Cell Theory
were now complete:
1. All organisms are composed of one
or more cells. (Schleiden & Schwann)(1838-
39)
2. The cell is the basic unit of life in all
living things. (Schleiden & Schwann)(1838-
39)
3. All cells are produced by the division
of preexisting cells. (Virchow)(1858)
You're invited...
Components of All
CELLS
1) THE CELL (PLASMA) MEMBRANE
 The cell membrane is a thin, dynamic
membrane that encloses the cell and controls
what enters and leaves the cell.
 This membrane separates the cell’s content
from the external environment.
 It is consist mainly of a Phospholipid Bilayer.
You're invited...
Components of All
CELLS
1) THE CELL (PLASMA) MEMBRANE
You're invited...
Components of All
CELLS
Common Membrane Proteins
You're invited...
Components of All
CELLS
2. CYTOPLASM
 Is a gel-like matrix of water, enzymes,
nutrients, wastes, and gases and contains
cell structures (organelles).
 Fluid around the organelles called cytosol.
 Most of the cells metabolic reactions occur
in the cytoplasm.
You're invited...
Components of All
CELLS
3. DNA (deoxyribonucleic acid)
DNA, or deoxyribonucleic acid, contains the
information needed for the creation of proteins
(which include enzymes and hormones) and is
stored in the nucleus, as already said, in the
form of chromatin or chromosomes.
The nucleus is the site of DNA duplication,
which is needed for cell division (mitosis) and
organism reproduction and growth.
You're invited...
Contraints on CELL
Size
 A cell exchanges substances with its environment at a
rate that keeps pace with its metabolism. These
exchanges occur across the plasma membrane, which
can handle only so many exchanges at a time.
 The rate of exchange across a plasma membrane
depends on its surface are: “The bigger it is, the more
substance can cross it during a given time”.
 Cell size is limited by a physical relationship called the
Surface-to-Volume Ratio. By this ratio, an object’s volume
increases with the cube of its diameter, but its surface
increases only with the square.
You're invited...
Contraints on CELL
Size
Base on the Picture, when a cell expands in diameter, its
volume increases faster that its surface are does.
o If the cell gets too big, the inward flow of nutrients and the outward
flow of wastes across that membrane will not be fast enough to keep
the cell alive.
o Surface-to-Volume limits also affects the form of colonial organisms
and multicelled bodies.
You're invited...
The NUCLEUS
 Brain of Cell
 Bordered by a porous
membrane - nuclear
envelope.
 Contains thin fibers of
DNA and protein called
Chromatin.
 Rod Shaped
Chromosomes
 Contains a small round
nucleolus
•produces ribosomal RNA
which makes ribosomes.
You're invited...
The NUCLEUS
2 Important Function:
1) It keeps the cell’s genetic
material-DNA-safe from
metabolic processes that might
damage it.
2) It controls the passage of certain
molecules across its membrane.
You're invited...
The NUCLEUS
STRUCTURE OF THE NUCLEUS
the nuclear envelope
nucleoplasm
chromatin
the nucleolus
the two major
types of
materials
Structure of Nucleus
NUCLEAR ENVELOPE
The nuclear envelope is a double-layered membrane perforated with pores,
which control the flow of material going in and out of the nucleus.
The outer layer is connected to the endoplasmic reticulum, communicating with
the cytoplasm of the cell. The exchange of the large molecules (protein and
RNA) between the nucleus and cytoplasm happens here.
The inner layer of animal cell nuclei is covered and supported by the nuclear
lamina , a dense mesh of fibrous proteins.
The two layer of a nuclear envelope connect at nuclear pores.
Structure of Nucleus
CHROMATIN & CHROMOSOMES
Chromosomes contain DNA in a condensed form attached to a
histone protein.
Chromatin is comprised of DNA. There are two types based on
function.
 Heterochromatin: highly condensed, transcriptionally
inactive mostly located adjacent to the nuclear membrane
 Eurochromatin: delicate, less condensed organization of
chromatin, located in a transcribing cell
Structure of Nucleus
NUCLEOLUS
 It is an irregularly shaped region,
dense with proteins and nucleic acids,
where subunits of ribosomes are being
produced.
 The subunits pass through nuclear
pores into the cytoplasm, where they join
and become active in protein synthesis.
You're invited...
The ENDOMEMBRANE
SYSTEM
 It is a series of interacting organelles between the
nucleus and the plasma membrane.
MAIN FUNCTIONS:
o Is to make lipids, enzymes, and proteins for
insertion into the cell’s membranes or secretion to
the external environment.
o It is also destroy toxins, recycle wastes, and has
other special functions.
You're invited...
The ENDOMEMBRANE
SYSTEM
Small, membrane-enclosed sacs called VESICLES
form by budding from other organelles or when a
patch of plasma membrane sinks into the cytoplasm.
Many types carry substances from one organelle to
another:
 PEROXISOMES
 LYSOSOMES
 ENDOCYTIC and EXOCYTIC
 CENTRAL VACUOLE
You're invited...
The ENDOMEMBRANE
SYSTEM
Vesicles
 Endocytic and exocytic: Transport or store
polypeptides and lipids
 Peroxisomes: Digest fatty acids and amino
acids; break down toxins and metabolic by-
products
 Lysosomes: Intracellular digestion (animals)
 Central vacuole: Storage; fluid pressure
(plants)
You're invited...
The ENDOMEMBRANE
SYSTEM
ENDOPLASMIC RETICULUM
 network of interconnected parallel membranes (maze), that is
continuous with the nuclear membrane;
2. Two types:
a. Rough Endoplasmic Reticulum (RER)
1. ER studded with ribosomes;
2. Function = protein synthesis and intraceluar
transportation of molecules ;
b. Smooth Endoplasmic Reticulum (SER)
lacks ribosomes;
1. Function = lipid & cholesterol synthesis and Stores
calcium.
You're invited...
Endoplasmic reticulum
You're invited...
MITOCHONDRIA
Break down organic compounds by
aerobic respiration (oxygen-requiring)
Produce ATP
kidney-shaped organelle whose inner
membrane is folded into shelf-like partitions
called cristae;
"Powerhouse" of the cell = site of cellular
respiration where energy is released from
glucose.
You're invited...
CHLOROPLASTS
Produce sugars by
photosynthesis
Double membrane
Center section contains grana
Thylakoid (coins) make up the
grana.
Stroma - gel-like material
surrounding grana
Found in plants and algae.
You're invited...
CHLOROPLASTS
CHROMOPLAST
are plastids that make and
store pigments other than
chlorophylls.
AMYLOPLAST
are unpigmented plastids
that make and store starch grain.
You're invited...
CYTOSKELETON
Microtubule
Microfilaments
 Framework of the cell
 Contains small microfilaments and larger microtubules.
 They support the cell, giving it its shape and help with the
movement of its organelles.
 Is a network of fibers extending throughout the cytoplasm
 Fibers appear to support the endoplasmic reticulum, mitochondria,
and “free” ribosomes
You're invited...
CYTOSKELETON
FUNCTIONS:
 Organizes and moves cell parts
 Reinforces cell shape
 Interactions between motor proteins and
microtubules in cilia, flagella, and pseudopods can
move the whole cell
You're invited...
CYTOSKELETON
Components of the Cytoskeleton
Microtubules
Microfilaments
Intermediate filaments
You're invited...
Components of
Cytoskeleton
MICROTUBULE
 Are long, hollow cylinders that consist of subunits
of the protein tubuli.
 They form a dynamic scaffolding for many
cellular processes, rapidly assembling when they
are needed, disassembling when they are not.
 Guide movement of organelles (their function is
to move things around in the cell)
 Help separate the chromosome copies in dividing
cells
You're invited...
Components of
Cytoskeleton
MICROFILAMENTS
Are fibers that consists primarily of subunits of a protein
called Actin.
It connect plasma membrane proteins to other proteins
inside the cell.
 Solid rods of globular proteins.
 Important component of cytoskeleton which offers
support to cell structure.
 Microfilaments can slide past each other, causing
shortening of the cell
You're invited...
Components of
Cytoskeleton
MICROFILAMENTS
You're invited...
Components of
Cytoskeleton
INTERMEDIATE FILAMENTS
Are the most stable elements of the cytoskeleton, forming
a framework that lends structure and resilience to cells and
tissues in multicelled organisms.
Intermediate filaments are twisted protein strands slightly
thicker than microfilaments; they form much of the
supporting framework in many types of cells.
You're invited...
MOTOR PROTEINS
 are like freight trains, dragging cellular cargo along tracks of
microtubules and microfilaments.

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Earth and Life Science Grade 11

  • 1. Earth and Life Science Chapter 10
  • 2. You're invited... Objectives: When you complete this chapter, you should be able to: •Examine the principles of cell theory. •Describe the components of cell using a diagram. •Identify the components of the endomembrane system in a eukaryotic cell. •Examine the importance of the endomembrane system in a eukaryotic cell. •Examine the components of a cytoskeleton using diagrams and examples. •Describe the characteristics and functions of the extracellular matrix in a cell sing an example. •Examine the properties that are unique to living organisms. •Examine the laws of thermodynamics. •Examine the importance of energy to all living organisms. •Examine the characteristics of sunlight. •Examine how the wavelength of light affects photosynthesis. •Examine the role of pigments in photosynthesis. •Describe the process of photosynthesis using a flowchart. •Examine the different methods used by photosynthetic organisms to fix carbon.
  • 3. You're invited... What is a Cell?  The cell is the basic unit of structure and function in living things. Cells vary in their shape size, and arrangements but all cells have similar components, each with a particular function.  Some of the 100 trillion of cells make up human body.  All human cell are microscopic in size, shape and function.  The diameter range from 7.5 micrometer (RBC) to 150 mm (ovum).
  • 4. You're invited... What is a Cell? - Cell is defined as the fundamental living unit of any organism. - Cell is important to produce energy for metabolism (all chemical reactions within a cell) - Cell can mutate (change genetically) as a result of accidental changes in its genetic material (DNA). - Cytology: the study of the structure and functions of cells.
  • 5. You're invited... Cell History Cytology- study of cells  Used a microscope to examine cork (plant)  Hooke called what he saw "Cells“  He described the cells as tiny boxes or a honeycomb  He thought that cells only existed in plants and fungi 1665 – Robert Hooke Cork Cells
  • 6. You're invited... Cell History 1673- Anton van Leeuwenhoek  1673- Used a handmade microscope to observe pond scum & discovered single- celled organisms  He called them “animalcules”  He also observed blood cells from fish, birds, frogs, dogs, and humans  Therefore, it was known that cells are found in animals as well as plants
  • 7. You're invited... Cell History 1838 - Matthias Schleiden A botanist who concluded that all plants are made of cells. Typical Plant Cell
  • 8. You're invited... Cell History 1839 - Theodor Schwann A zoologist who concluded that all animals are made of cells. Nerve Cells
  • 9. You're invited... Cell History 1858 - Rudolph Virchow 1858- Rudolf Virchow, German physician, after extensive study of cellular pathology, concluded that cells must arise from preexisting cells.
  • 10. You're invited... Cell Theory The COMBINED work of Schleiden, Schwann, and Virchow make up the modern CELL THEORY.
  • 11. You're invited... Cell Theory The 3 Basic Components of the Cell Theory were now complete: 1. All organisms are composed of one or more cells. (Schleiden & Schwann)(1838- 39) 2. The cell is the basic unit of life in all living things. (Schleiden & Schwann)(1838- 39) 3. All cells are produced by the division of preexisting cells. (Virchow)(1858)
  • 12. You're invited... Components of All CELLS 1) THE CELL (PLASMA) MEMBRANE  The cell membrane is a thin, dynamic membrane that encloses the cell and controls what enters and leaves the cell.  This membrane separates the cell’s content from the external environment.  It is consist mainly of a Phospholipid Bilayer.
  • 13. You're invited... Components of All CELLS 1) THE CELL (PLASMA) MEMBRANE
  • 14. You're invited... Components of All CELLS Common Membrane Proteins
  • 15. You're invited... Components of All CELLS 2. CYTOPLASM  Is a gel-like matrix of water, enzymes, nutrients, wastes, and gases and contains cell structures (organelles).  Fluid around the organelles called cytosol.  Most of the cells metabolic reactions occur in the cytoplasm.
  • 16. You're invited... Components of All CELLS 3. DNA (deoxyribonucleic acid) DNA, or deoxyribonucleic acid, contains the information needed for the creation of proteins (which include enzymes and hormones) and is stored in the nucleus, as already said, in the form of chromatin or chromosomes. The nucleus is the site of DNA duplication, which is needed for cell division (mitosis) and organism reproduction and growth.
  • 17. You're invited... Contraints on CELL Size  A cell exchanges substances with its environment at a rate that keeps pace with its metabolism. These exchanges occur across the plasma membrane, which can handle only so many exchanges at a time.  The rate of exchange across a plasma membrane depends on its surface are: “The bigger it is, the more substance can cross it during a given time”.  Cell size is limited by a physical relationship called the Surface-to-Volume Ratio. By this ratio, an object’s volume increases with the cube of its diameter, but its surface increases only with the square.
  • 18. You're invited... Contraints on CELL Size Base on the Picture, when a cell expands in diameter, its volume increases faster that its surface are does. o If the cell gets too big, the inward flow of nutrients and the outward flow of wastes across that membrane will not be fast enough to keep the cell alive. o Surface-to-Volume limits also affects the form of colonial organisms and multicelled bodies.
  • 19. You're invited... The NUCLEUS  Brain of Cell  Bordered by a porous membrane - nuclear envelope.  Contains thin fibers of DNA and protein called Chromatin.  Rod Shaped Chromosomes  Contains a small round nucleolus •produces ribosomal RNA which makes ribosomes.
  • 20. You're invited... The NUCLEUS 2 Important Function: 1) It keeps the cell’s genetic material-DNA-safe from metabolic processes that might damage it. 2) It controls the passage of certain molecules across its membrane.
  • 21. You're invited... The NUCLEUS STRUCTURE OF THE NUCLEUS the nuclear envelope nucleoplasm chromatin the nucleolus the two major types of materials
  • 22. Structure of Nucleus NUCLEAR ENVELOPE The nuclear envelope is a double-layered membrane perforated with pores, which control the flow of material going in and out of the nucleus. The outer layer is connected to the endoplasmic reticulum, communicating with the cytoplasm of the cell. The exchange of the large molecules (protein and RNA) between the nucleus and cytoplasm happens here. The inner layer of animal cell nuclei is covered and supported by the nuclear lamina , a dense mesh of fibrous proteins. The two layer of a nuclear envelope connect at nuclear pores.
  • 23. Structure of Nucleus CHROMATIN & CHROMOSOMES Chromosomes contain DNA in a condensed form attached to a histone protein. Chromatin is comprised of DNA. There are two types based on function.  Heterochromatin: highly condensed, transcriptionally inactive mostly located adjacent to the nuclear membrane  Eurochromatin: delicate, less condensed organization of chromatin, located in a transcribing cell
  • 24. Structure of Nucleus NUCLEOLUS  It is an irregularly shaped region, dense with proteins and nucleic acids, where subunits of ribosomes are being produced.  The subunits pass through nuclear pores into the cytoplasm, where they join and become active in protein synthesis.
  • 25. You're invited... The ENDOMEMBRANE SYSTEM  It is a series of interacting organelles between the nucleus and the plasma membrane. MAIN FUNCTIONS: o Is to make lipids, enzymes, and proteins for insertion into the cell’s membranes or secretion to the external environment. o It is also destroy toxins, recycle wastes, and has other special functions.
  • 26. You're invited... The ENDOMEMBRANE SYSTEM Small, membrane-enclosed sacs called VESICLES form by budding from other organelles or when a patch of plasma membrane sinks into the cytoplasm. Many types carry substances from one organelle to another:  PEROXISOMES  LYSOSOMES  ENDOCYTIC and EXOCYTIC  CENTRAL VACUOLE
  • 27. You're invited... The ENDOMEMBRANE SYSTEM Vesicles  Endocytic and exocytic: Transport or store polypeptides and lipids  Peroxisomes: Digest fatty acids and amino acids; break down toxins and metabolic by- products  Lysosomes: Intracellular digestion (animals)  Central vacuole: Storage; fluid pressure (plants)
  • 28. You're invited... The ENDOMEMBRANE SYSTEM ENDOPLASMIC RETICULUM  network of interconnected parallel membranes (maze), that is continuous with the nuclear membrane; 2. Two types: a. Rough Endoplasmic Reticulum (RER) 1. ER studded with ribosomes; 2. Function = protein synthesis and intraceluar transportation of molecules ; b. Smooth Endoplasmic Reticulum (SER) lacks ribosomes; 1. Function = lipid & cholesterol synthesis and Stores calcium.
  • 30. You're invited... MITOCHONDRIA Break down organic compounds by aerobic respiration (oxygen-requiring) Produce ATP kidney-shaped organelle whose inner membrane is folded into shelf-like partitions called cristae; "Powerhouse" of the cell = site of cellular respiration where energy is released from glucose.
  • 31. You're invited... CHLOROPLASTS Produce sugars by photosynthesis Double membrane Center section contains grana Thylakoid (coins) make up the grana. Stroma - gel-like material surrounding grana Found in plants and algae.
  • 32. You're invited... CHLOROPLASTS CHROMOPLAST are plastids that make and store pigments other than chlorophylls. AMYLOPLAST are unpigmented plastids that make and store starch grain.
  • 33. You're invited... CYTOSKELETON Microtubule Microfilaments  Framework of the cell  Contains small microfilaments and larger microtubules.  They support the cell, giving it its shape and help with the movement of its organelles.  Is a network of fibers extending throughout the cytoplasm  Fibers appear to support the endoplasmic reticulum, mitochondria, and “free” ribosomes
  • 34. You're invited... CYTOSKELETON FUNCTIONS:  Organizes and moves cell parts  Reinforces cell shape  Interactions between motor proteins and microtubules in cilia, flagella, and pseudopods can move the whole cell
  • 35. You're invited... CYTOSKELETON Components of the Cytoskeleton Microtubules Microfilaments Intermediate filaments
  • 36. You're invited... Components of Cytoskeleton MICROTUBULE  Are long, hollow cylinders that consist of subunits of the protein tubuli.  They form a dynamic scaffolding for many cellular processes, rapidly assembling when they are needed, disassembling when they are not.  Guide movement of organelles (their function is to move things around in the cell)  Help separate the chromosome copies in dividing cells
  • 37. You're invited... Components of Cytoskeleton MICROFILAMENTS Are fibers that consists primarily of subunits of a protein called Actin. It connect plasma membrane proteins to other proteins inside the cell.  Solid rods of globular proteins.  Important component of cytoskeleton which offers support to cell structure.  Microfilaments can slide past each other, causing shortening of the cell
  • 39. You're invited... Components of Cytoskeleton INTERMEDIATE FILAMENTS Are the most stable elements of the cytoskeleton, forming a framework that lends structure and resilience to cells and tissues in multicelled organisms. Intermediate filaments are twisted protein strands slightly thicker than microfilaments; they form much of the supporting framework in many types of cells.
  • 40. You're invited... MOTOR PROTEINS  are like freight trains, dragging cellular cargo along tracks of microtubules and microfilaments.