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Cells and Organelles; The Cell Membrane

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Cells and Organelles; The Cell Membrane Book Reference: p.16-p.19 Do all membranes have the same basic structure? Both the cell surface membrane and the membranes ... – PowerPoint PPT presentation

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Title: Cells and Organelles; The Cell Membrane


1
Cells and OrganellesThe Cell Membrane
  • Book Reference p.16-p.19

2
Do all membranes have the same basic structure?
  • Both the cell surface membrane and the membranes
    surrounding certain organelles have the same
    basic structure. Much of the membrane is made up
    of a 'sea' of phospholipids with protein
    molecules 'floating' in between the
    phospholipids.

3
Where are proteins located within the membrane?
  • What is an intrinsic protein?
  • What is an extrinsic protein?
  • Why is it called the fluid mosaic model?

4
INTRINSIC 1Channel Proteins
  • Allow movement of substances, such as glucose,
    across the membrane
  • NO ATP REQUIRED

5
INTRINSIC 2Carrier Proteins
  • Actively transport substances, such as minerals,
    across the membrane
  • ATP is REQUIRED

6
(a) Channel VS (b) Carrier
Proteins
7
Bilayer Phospholipids
  • What is the bilayer?
  • The phosphate heads are polar molecules and so
    are water-soluble.
  • The lipid tails are non-polar and therefore are
    not water-soluble.

8
Why do phospholipids have both a hydrophilic and
a hydrophobic part?
  • The phosphate heads are polar. Are they
    water-soluble?
  • The lipid tails are non-polar. Are they
    water-soluble?

9
What is a polysaccharide?
  • Clue polymer monomer carbohydrate

10
(No Transcript)
11
Glycowhat?
  • What is the difference between a glycoprotein
    and a glycolipid?

12
What is the role of glycoproteins?
  • They may help in the recognition of, and
    interaction with, other cells. They may also play
    a part in the recognition of hormones and foreign
    molecules.

13
What is the role of cholesterol in the cell
membrane?
  • Cholesterol is also present in the membrane. It
    maintains the fluidity and increases the
    stability of the membrane. Without cholesterol
    the membrane would easily split apart

14
Cell membrane Functions
  • Selectively permeable barrier.
  • Structural, keeping the cell contents together.
  • Allows communication with other cells.
  • Allows recognition of other external substances.
  • Allows mobility in some organisms, e.g. amoeba.
  • The site of various chemical reactions.

15
Cells and OrganellesTissues
  • Some organisms do exist as single cells - for
    example, Amoeba,
  • but many organisms are multicellular and consist
    of from hundreds to billions of cells.
  • The functions of the organism are divided up
    amongst the groups of cells, which become
    specialised for particular roles.
  • Specialised cells show division of labour by
    being grouped into tissues.

16
What is a Tissue? Definition
  • A tissue is defined as a collection of cells,
    together with any extracellular secretion, that
    is specialised to perform one or more particular
    function. Tissues may contain only one type of
    cell, or several types.

17
Website Reference www.s-cool.co.ukgo to
Biology and then 1.Cells and Organelles 2.Gas
Exchange3.Transport
18
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