Portion for the Final Exams

HL / SL / ISC Bio students (all)

 

• Topic 2: Cells ( 2.1 to 2.5)
• Topic 3: The Chemistry of Life ( 3.1 to 3.3 and 3.6 to 3.7)
• Topic 5: Ecology and Evolution: (5.1 )

 

AHL material  / SL / ISC Option C (all)

 

Topic 7.5 Proteins,  7.6 Enzymes,   8.1 Cell respiration and  8.2 Photosynthesis = Option C ( C1 Proteins, C2 Enzymes, C3 Cell respiration and C4 Photosynthesis)

 

HL only:

 

Topic 9  Plant science ( 9.1 to 9.3)

Topic 10  Genetics( 10.1 to 10.3)

Topic 7: Nucleic acids ( 7.1and 7.2)

 

SL/ ISC

The exam will be divided into Paper I MCQ (Multiple choice questions), II ( Graph data analysis and short/long answer questions)and III ( Option C)

 

HL

Paper I MCQ (Multiple choice questions), II ( Graph data analysis and short/long answer questions).

 

All the best!

 

Ms S

Topic 5: Ecology and evolution

5.1: Communities and Ecosystems

smithscience.wikispaces.com/file/view/Ecology+Vocabulary+Words.pdf‎

http://click4biology.info/c4b/5/eco5.1.htm

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/FoodChains.html

http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/foodchains/foodchains1.shtml

5.1.3: Detritivores:

Detritivores (also known as saprophages, detrivores or detritus feeders) are organisms that recycle detritus (decomposing organic material), returning it into the food chain.

Earthworms are a well-known example of detritus feeders, eating rotting plant leaves and other debris. Some detritus feeders, such as dung beetles, eat feces, which often contains a considerable nutrient load. The detritus may already have been partially or fully decomposed by decomposers.

Groups of detritivorous animals include: millipedes, woodlice, dung beetles, dung flies and burying beetles.

From: (http://answers.yahoo.com/question/index?qid=20061120163302AAemMSn)

Decomposers

http://www.nhptv.org/natureworks/nwep11b.htm

5.1.13

http://voices.yahoo.com/energy-flow-through-ecosystem-585920.html

Ms S

3.8 / 8.2 and Option C4: Photosynthesis

3.8.2 Light is composed of a range of colours at different wavelengths

http://scienceline.ucsb.edu/getkey.php?key=3155

3.8.4

http://firstyear.chem.usyd.edu.au/calculators/colour_wheel.shtml

3.8.5, 8.2.3 & C.4.3

http://highered.mcgraw-hill.com/olc/dl/120072/bio12.swf

http://highered.mcgraw-hill.com/olc/dl/120072/bio13.swf

3.8.6 , 8.2.4 & C.4.4

http://www.uic.edu/classes/bios/bios100/lectures/light_reaction.htm

What are we doing with the leaves that you have brought after taping dark paper on one leaf surface?

April 15, 2013

Paper Chromatography of plant pigments

As discussed we will examine the pigments contained in a variety of leaves in class today.

The calculation of the Rf value at the very end will help you identify the pigments contained in the leaf sample you tested.

Create a table to note down the distances traveled by the solvent and the various pigments in cms or mms.

The starting point must be 1.5cm/ 15mms from the base.

Rf = distance migrated by the pigment / distance migrated by the solvent.

The solvent you will be using is a mixture of Petroleum ether and Acetone.

We will use foil to seal the beakers to avoid evaporation and place all beakers in the fume hood. Keep your rulers handy to measure the distances.

See you in class.

PS: The lab report will basically be data collection and evaluation to identify which pigment it is that the leaf contained.  Due: next week as usual!

24/4/2013

8.2.5 & C.4.5  Light independent reactions:

http://www.uic.edu/classes/bios/bios100/lectures/calvin.htm

http://highered.mcgraw-hill.com/sites/0070960526/student_view0/chapter5/animation_quiz_1.html

8.2.6: Chloroplast structure

http://www.biology4kids.com/files/cell_chloroplast.html

http://www.buzzle.com/articles/chloroplast-function.html

8.2.7 Absorption vs Action spectrum

http://ibbiology.wetpaint.com/page/Explain+the+relationship+between+the+action+%26+absorption+spectrums

Ms S

3.7 Respiration

3.7.2

http://highered.mcgraw-hill.com/sites/0072507470/student_view0/chapter25/animation__how_glycolysis_works.html

http://www.science.smith.edu/departments/Biology/Bio231/glycolysis.html

3.7.3

http://www.phschool.com/science/biology_place/biocoach/cellresp/review5a.html

3.7.4

http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html

http://leavingbio.net/respiration-%28higher%20level%29.htm

21/3/2013

• Analysis of data collected in class last week: one worm vs 7 worms in the bio chamber and Vernier data logger

Attach graph to your Data analysis and conclusion report.

DUE DATE: MARCH 27th or EARLIER( if you plan to travel before Wednesday and or plan to be absent!!!!)

• Effect of temperature on the respiration of germinating seedlings: lab report and answers to questions due APRIL 8, 2013

Ms S

3.6: Enzymes and Option C / AHL 7.6

3.6.1, 3.6.2

Enzymes are catalysts. Most are proteins. (A few ribonucleoprotein enzymes have been discovered and, for some of these, the catalytic activity is in the RNA part rather than the protein part. Link to discussion of these ribozymes.)

Enzymes bind temporarily to one or more of the reactants — the substrate(s) — of the reaction they catalyze. In doing so, they lower the amount of activation energy needed and thus speed up the reaction.

(http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/E/Enzymes.html)

http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/enzymes/enzymes2.shtml

3.6.3

http://www.worthington-biochem.com/introbiochem/effectsph.html

3.6.4 Denaturation of enzymes

http://www.biology-online.org/biology-forum/about472.html

3.6.5

http://www.mayoclinic.com/health/lactose-intolerance/DS00530

Monday, 21st Jan  Lab: Catalase from potatoes

“In animals, such as us, oxidative molecules are most often produced through our metabolizing of food molecules.  So the presence of catalase makes sense.  Plants do not eat, so why would they need catalase?  If we study the process of photosynthesis we may come across a term called photorespiration.  Photorespiration simply is when a plant receives too much light and not enough water.  As a result, the plant can produce large amounts of hydrogen peroxide which can kill the plant.  Fortunately, catalase prevents the accumulation of hydrogen peroxide by converting it to water and oxygen, and so saves the plant from oxidative damage.” (http://practicalbio.blogspot.com/2012/03/easy-enzyme-experiment-potato-catalase.html)

Studying the effect of temperature on Catalase:

Procedure:

0.5 tsp mashed potato in each test tube

1.0ml distilled water

Keep these test tubes at different temperatures for 3 minutes for them to arrive at the required temperature( Very cold; cold; room temperature; warm, hot; very hot)

Add 5.0ml of H2O2 solution and wait for 1 minute.

Measure the level of foam formed in each test tube once the H2O2 has been added.

Record all the readings in a data table you have created.

OR

Use filter paper discs coated with the Catalase and note the time taken for the disc to rise.

Monday, 28/1/2012

3.6.5: Enzymes for commercial purposes / everyday use

\http://biotech.about.com/od/whatisbiotechnology/a/EverydayEnzymes_2.htm

Feb 5, 2013

Option c.2.4 / AHL 7.6.4

Inhibition of enzyme action

http://www.elmhurst.edu/~chm/vchembook/573inhibit.html

Ms S

3.3 DNA structure

My first post in 2013!

 

http://www.chemguide.co.uk/organicprops/aminoacids/dna1.html

When we want to extract DNA:

http://learn.genetics.utah.edu/content/labs/extraction/

http://learn.genetics.utah.edu/content/labs/extraction/howto/

 

We are now ready to extract DNA from a variety of sources!

 

Ms S

Topic 3.2: Carbohydrates, Lipids and Proteins

For all of 3.2:

Starting with: identifying the structure of Glucose, Ribose, fatty acids and Amino acids

http://ibbiology.wetpaint.com/page/Identify+amino+acids,+glucose,+ribose+and+fatty+acids+from+diagrams

http://click4biology.info/c4b/3/chem3.2.htm

3.2.5: Glycosidic and Peptide bond formation:

http://www.mrothery.co.uk/biochm/biochmnotes.htm

November 20, 2012

http://click4biology.info/c4b/3/Chem3.2.htm