BBC How Plants Communicate & Think - Amazing Nature Documentary

Reproductive Cycle of Flower Plants / The Amazing Lives of Plants

What is weather?

http://www.bbc.co.uk/schools/whatisweather/aboutweather/flash_menu.shtml

Climate change

http://www3.epa.gov/climatechange/kids/index.html

Plant Time Lapse

Wow - the biggest flower in the world - Titan Arum - David Attenborough...

Giant Amazon Lily

10 Most DEADLY Plants on Earth!

The beauty of pollination

Rosalind Franklin - My Favourite Scientist

Lies, Thieves and DNA

DNA - Chalk Talk

Enzymes Make the World Go 'Round

http://www.chem4kids.com/files/bio_enzymes.html

Enzymes are biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life. Let’s say you ate a piece of meat. Proteases would goto work and help break down the peptide bonds between the amino acids.

Will all enzymes break down all substances? No. Enzymes are very specific catalysts and usually work to complete one task. An enzyme that helps digest proteins will not be useful to break down carbohydrates. Also, you will not find all enzymes everywhere in the body. That would be inefficient. There are unique enzymes in neural cells, intestinal cells, and your saliva. 

Assembly Line Robots

You all know about cars and the assembly lines where they are made. There are giant robots helping people do specific tasks. Some lift the whole car, some lift

doors, and some put bolts on the frames. Enzymes are like those giant robots. They grab one or two pieces, do something to them, and then release them. Once their job is done, they move to the next piece and do the same thing again. They are little protein robots inside your cells.

The robot that was designed to move a car door can't put brakes on the car. The specialized robot arms just can't do the job. Enzymes are the same. They can only work with specific molecules and only do specific tasks. Because they are so specific, their structure is very important. If only one amino acid of the enzyme is messed up, the enzyme might not work. It would be as if someone unplugged one of the cords in a robot.

 For example, some herbicides are used to block plant enzyme activity. A tiny herbicide molecule can attach to the active site of an enzyme and stop it from working. Plants have adapted by changing one or two amino acids in their enzymes. They adjust their structure, are able to continue working, and the herbicide can no longer limit the enzyme. 

Four Steps of Enzyme Action

1. The enzyme and the substrate are in the same area. Some situations have more than one substrate molecule that the enzyme will change.

2. The enzyme grabs on to the substrate at a special area called the active site. The combination is called the enzyme/substrate complex. Enzymes are very, very specific and don't just grab on to any molecule. The active site is a specially shaped area of the enzyme that fits around the substrate. The active site is like the grasping claw of the robot on the assembly line. It can only pick up one or two parts.

3. A process called catalysis happens. Catalysis is when the substrate is changed. It could be broken down or combined with another molecule to make something new. It will break or build chemical bonds. When done, you will have the enzyme/products complex. 

4. The enzyme releases the product. When the enzyme lets go, it returns to its original shape. It is then ready to work on another molecule of substrate.

Can You Control Them?

Good question! We know what you're thinking: "What if enzymes just kept going and converted every molecule in the world? They would never stop. They would become monsters!" Don’t worry. There are many factors that can regulate enzyme activity, including temperature, activators, pH levels, and inhibitors.

 

1ºB EXPERIMENTS!!!

Click on Monday, 3 November 2014.
You will find cool experiments for your project.
Good luck.