test 2 - 27/09/201006:10:00 Membranes Key concepts (see...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
     Membranes 27/09/2010 06:10:00 Key concepts (see slides for numbers that show where these KCs match up): Basic membrane properties o 1. Basic structure and function of biological membranes o 2. Factors affecting membrane fluidity in various organisms o 3. Be able to relate saturated and unsaturated fats to the ecology of organisms Movement of small molecules across membranes o 4. Understand the principles of the passage of hydrophilic (polar) and hydrophobic (nonpolar) molecules through biological membranes and be able to apply these to examples from lecture o 5. Membrane proteins: understand what their features are, when transport proteins are needed, and when ATP energy is needed to fuel transport o 6. The Na+/K+ pump as an example for ATP-fueled ion pumps Movement of big molecules across membranes: endocytosis o 7. Understand the genetic and dietary factors affecting LDL levels and the LDL receptor, and be able to relate this to receptor-mediated endocytosis and heart disease Signal delivery across membranes o 8. Principal difference in signal transduction of a protein hormone versus a steroid hormone o 9. Be able to relate aquaporin structure to aquaporin function Real-world implications of an important transport protein: Aquaporins o 10. Be able to relate examples of aquaporin involvement (in human kidney, lung, eye, mouth, skin) to the regulation of water movement 2 main functions: regulate movement of substances in and out of cells or organelles (e.g. uptake of food molecules from gut into your cells) also allow maintenance of stable internal environment within cells; separate inside space into specialized regions, organelles for incompatible functions Phospholipid bilayer
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
as the basic membrane structure phospholipids have hydrophilic and hydrophobic regions Fluid-Mosaic Membrane Membranes: mosaic of phospholipids and proteins Membranes: typically “fluid” with consistency of salad oil o Fluidity level varies with temperature The effect of unsaturated versus saturated phospholipids on membrane fluidity In organisms that do not regulate body temperature (microorganisms, plants & non-regulating animals) Unsaturated hydrocarbon tails have kinks and they are more fluid o By having more kinks it makes the organism more fluid Saturated hydrocarbon tails make the organism more viscous Unsaturated fatty acid is more abundant in the membranes of plants and microbes in cold environments Polyunsaturated benefit for membranes of plants and microbes in the coldest habitats on earth Saturated fatty acid would be more abundant in the membrane phospholipids of plants and microbes from hot environments Palm and coconut oils and macadamia nuts all have a lot of saturated fats because they are grown in the tropics The proportion of saturated fatty acids will be higher in the summer and then decrease in the winter in membranes of a plant in Colorado that grows throughout the hot summer season and over-winters during the cold winter
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/03/2011 for the course EBIO 1010 taught by Professor Adams during the Spring '11 term at Colorado.

Page1 / 27

test 2 - 27/09/201006:10:00 Membranes Key concepts (see...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online