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Chapter 7: Cell Membrane (plasma membrane)

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Chapter 7: Cell Membrane (plasma membrane) Lipids made of alcohol and carbon Tails are fatty acid chains Slight movement to allow water and substances to pass through ... – PowerPoint PPT presentation

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Title: Chapter 7: Cell Membrane (plasma membrane)


1
Chapter 7 Cell Membrane (plasma membrane)
2
Review the Characteristics of Life
  • Try to come up with as many characteristics you
    can. Living things
  • Reproduce.
  • Have genetic material.
  • Grow and develop.
  • Use materials and energy.
  • Respond to their environment.
  • Maintain homeostasis.
  • Change over time.
  • Are made up of units called cells.

3
What is a cell?
  • Smallest unit of living tissue collected together
    surrounded by a barrier that separates it from
    the surroundings.
  • All living things are made up of cells.
  • Here is a neat animation of relative size of
    cells and other objects.

4
Cell Theory
  • The cell theory states
  • All living things are composed of cells.
  • Cells are the basic units of structure and
    function in living things.
  • New cells are produced from existing cells.

5
Pro versus Eu
  • Cells fall into two broad categories, depending
    on whether the contain a nucleus (controls cells
    activities).
  • Prokaryotic
  • Does not contain
  • Eukaryotic
  • Does Contain

6
Review
  • If a cell of an organisms contains a nucleus, the
    organism is a (an)
  • A. plant
  • B. eukaryote
  • C. animal
  • D. prokaryote

7
Review
  • In many cells, the structure that controls the
    cells activities is the
  • A. cell membrane
  • B. organelle
  • C. Nucleolus
  • D. Nucleus

8
Review the Biomolecules
  • Four main biomolecules found in living things
  • Proteins
  • Various functions throughout cells/organism.
  • Lipids
  • Fats, steroids, oils. Doesnt mix with water.
  • Function store energy.
  • Carbohydrates
  • Function main source of energy.
  • Nucleotides
  • Function store genetic information
  • DNA or RNA

9
Cell Boundaries
  • The cell MEMBRANE regulates what enters and
    leaves the cell and also provides protection and
    support.
  • All cells have membranes.
  • Also phospholipid bilayer

10
Cell Membrane
11
Cell Membrane
  • The cell membrane is made up of two layers called
    the lipid bilayer.
  • The heads of the lipids are on the outsides.
  • They are hydrophilic (hydro water philic
    loving).
  • The tails of the lipids are on the insides.
  • They are hydrophobic (phobic fearing/hating)
  • Studded throughout the membrane are proteins with
    various functions.

12
Lipids
  • made of alcohol and carbon
  • Tails are fatty acid chains
  • Slight movement to allow water and substances to
    pass through membrane (simple diffusion no
    energy)

13
Cell Membrane as a mosaic
  • Carbohydrate chain (glyco)- act like chemical
    identification cards allowing individual cells to
    identify one another
  • Glycoproteins
  • Glycolipids
  • Proteins channels and pumps help move material
    across the membrane
  • Integral protein (channel)
  • Peripheral protein
  • Lipids bilayer- gives the membrane a flexible
    structure that forms a strong barrier

14
Polar vs. Non-polar
  • POLAR/NONPOLAR
  • Polar means that the substance has positive or
    negative poles. Non-polar does NOT have positive
    or negative poles.
  • Polar things like other polar things. Water is
    polar!!!!!!!!!
  • Non-polar things like other non-polar things.
    Oil is non-polar!!!!!!
  • Selectively permeable- Some molecules can cross
    the membrane without assistance, most cannot.

15
Review
  • Cell membranes are constructed mainly of
  • A. lipid bilayers
  • B. protein pumps
  • C. carbohydrate gates
  • D. free-moving proteins
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