• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
2.4 membranes assessment statements
 

2.4 membranes assessment statements

on

  • 314 views

IB Biology Topic 2.4 Membranes Assessment Statements

IB Biology Topic 2.4 Membranes Assessment Statements

Statistics

Views

Total Views
314
Views on SlideShare
314
Embed Views
0

Actions

Likes
0
Downloads
3
Comments
0

0 Embeds 0

No embeds

Accessibility

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    2.4 membranes assessment statements 2.4 membranes assessment statements Document Transcript

    • I-Shou International School IB Biology 2.4 Membranes Assessment Statements 2.4.1 Draw and label a diagram to show the structure of membranes. Define the following terms. Saturated fatty acid Unsaturated fatty acid Lipid Phospholipid Draw and label a phospholipid. Draw and label a membrane. Include all the structures from the sample mark scheme below. 1 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology Sample markscheme for a 5 mark question. Award [1] for each of the following clearly drawn and correctly labelled. phospholipid bilayer —double row of opposing phospholipids, tails to inside; phospholipid —with head and two tails; hydrophilic/phosphate/polar (heads) and hydrophobic/hydrocarbon/fatty acid/non-polar (tails) labelled; integral protein — embedded in the phospholipid bilayer; protein channel — integral protein showing clear channel/pore; peripheral protein—on the surface; glycoprotein—with carbohydrate attached on one side; cholesterol—shown embedded in bilayer; Outline the function of the following membrane structures: Membrane Function Structure Phospholipid bilayer Integral Proteins Peripheral Proteins Glycoproteins Cholesterol 2.4.2 Explain how the hydrophobic and hydrophilic properties of phospholipids help to maintain the structure of cell membranes. Define the following terms. Amphipathic Hydrophilic Hydrophobic 2 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology Label the hydrophilic and hydrophobic regions of the phospholipid diagram below. Explain how the hydrophobic and hydrophilic properties of phospholipids help to maintain the structure of cell membranes.     2.4.3 List the functions of membrane proteins. Outline the functions of the following membrane proteins. Membrane Protein Function Channel protein Receptor protein Enzymes Electron carriers 3 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology 2.4.4 Define diffusion and osmosis. Define the terms below Diffusion Osmosis Passive transport Active transport What is meant by the term concentration gradient? Use arrows to show the net movement of small ions across the membrane below. Key water small ion State whether the movement above is: active / passive diffusion / osmosis Use arrows to show the net movement of water across the membrane below. State whether the movement above is: active / passive diffusion / osmosis 4 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology 2.4.5 Explain passive transport across membranes by simple diffusion and facilitated diffusion. Define the following terms with respect to membranes. Permeable Impermeable Semipermeable Define passive transport: State why some substances cannot cross membranes without help. State whether diffusion goes up or down concentration gradients. State whether diffusion is an active or passive process. What does this mean? Explain the role of proteins in helping larger polar molecules to cross the membrane. 5 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology 2.4.6 Explain the role of protein pumps and ATP in active transport across membranes. State the function of ATP in cells. Compare active and passive transport. Active Transport Passive Transport Needs ATP? Down/against concentration gradient? Needs membrane protein? Simple diffusion: Facilitated diffusion: Example of molecule transported Define conformational change: Describe the following terms in relation to active transport. Uniport cotransport Symport Antiport Note the word part meanings: + port: carry uni: one anti: against co: together + Explain how the Na /K ion pump functions on a neuron (a neuron is a nerve cell). 6 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology 2.4.7 Explain how vesicles are used to transport materials within a cell between the rough endoplasmic reticulum, Golgi apparatus and plasma membrane. Outline the form & function of the following: Rough endoplasmic reticulum Golgi apparatus Vesicles Annotate the diagram showing steps in the transport of materials from the RER  Golgi apparatus  plasma membrane. (diagram from http://www.ib.bioninja.com.au/) 7 Creative Commons License: By Darren Aherne, I-Shou International School
    • I-Shou International School IB Biology 2.4.8 Describe how the fluidity of the membrane allows it to change shape, break and re-form during endocytosis and exocytosis. Define the following terms: Endocytosis Exocytosis Note the word part meanings: en: in/inside/inward ex: out/ouside cyto: cell sis: process Describe the fluidity of phospholipids a membrane. Horizontal movement: Vertical movement: Role of cholesterol: (diagram from click4biology.info) Annotate the model diagram showing two membranes joining. Does this model show how endocytosis or exocytosis occurs? a) b) c) d) (from click4biology.info) 8 Creative Commons License: By Darren Aherne, I-Shou International School