Archive for October, 2010

Life processes

Wednesday, October 20th, 2010

Photosynthesis by One-Speed Photography on flickr

The two most important processes for living organisms are RESPIRATION and PHOTOSYNTHESIS.  As we learn about these, you must keep in mind what each has to do with ENERGY

Look at this document.  It is a webquest that will guide you through the main points to remember about respiration and photosynthesis.  Thanks to Mr Goodman for putting it together for us 🙂

Respiration and Photosynthesis Web quest

Typhoons

Wednesday, October 20th, 2010

Why do scientists believe that global warming will lead to more typhoons in places like the Philippines?

Take a look at this post about the recent typhoon that hit Luzon.

Warning – test ahead!

Wednesday, October 20th, 2010

no lifeguard on duty by Zoramite on flickr (modified)

Grade 10s  – you have a test coming on Genetics and Variation.  B block will take it on November 4th, E block on November 5th. 

Take a look at this revision checklist.  It will help prepare you for your test after the break.  Good luck!

Grade 10 REVISION checklist for Variation and Genetics

Enzymes

Thursday, October 14th, 2010

Lock and Key by B K Dewey on flickr

There are a lot of questions to answer in this topic.  It is one of my favourite aspects of biology, as an understanding of enzymes relates to nearly every branch of biology.  So, here goes….

What is an enzyme?  What is an active site?  What is enzyme specificity and what causes it?  What is the “lock and key” hypothesis? What effects do temperature, pH and substrate concentration have on enzyme activity?  What is denaturation?  How is lactose-free milk made?

What is the induced fit model of enzyme action? How do enzymes catalyze reactions?  What is the difference between competitive and non-competitive inhibition?  What are allosteric sites?  What is end-product inhibition?

Here are some useful resources. Mr Taylor’s presentationEnzymes AHL  These two clips (first and second) are good for review.  This one is pretty complicated – but I’m adding it as some of you aiming for 7s may like to look at it.

Global applications of energy transfer

Monday, October 11th, 2010

Blue Marble (planet earth) by woodleywonderworks on flickr

Each table will be given one of the following questions to research.  Find out all you can, remembering to discuss heat transfer in your answers.   Then we’ll share our findings with the class. The link below each question takes you to a youtube clip that will help to get you started.  Eventually you will post your findings as comments to this blogpost.

Genetics

Monday, October 11th, 2010

Genetics by Here's Kate on flickr

The system of inheritance is actually very logical.  We will learn what alleles are and how they combine to form an individual’s characteristics.  We will look at simple monohybrid crosses, involving things like eye colour, tongue-rolling and earlobes.  Then we will expand into multiple alleles and co-dominance (blood groups).  Next we’ll understand why equal numbers of boys and girls are born in the world and look at examples of sex-linked inheritance.  We will be simplifying the concepts – in reality many human characteristics are controlled by several genes on different chromosomes – so the real picture is more complex.  And we’ll finish up with a discussion of how much of our variation is down to our genes, and how much is due to environment.

There will be some new vocabulary to learn (Genetics terms), then lots and lots of problems to solve.  Try these ones for starters:  Genetics Questions and Simple Genetics problems

Here are some questions on co-dominance, multiple alleles and sex-linkage. Genetics Problems

This document contains a list of great websites with plenty more genetics practice. Online genetics problems

Chemicals of life

Monday, October 4th, 2010

B0007705 Amino acid: Tyrosine by wellcome images on flickr

  • Can you distinguish between organic and inorganic compounds?
  • Can you identify carbohydrates, lipids and proteins from diagrams?
  • Can you explain the role of condensation and hydrolysis reactions between amino acids and polypeptides, between mono, di and polysaccharides, and between fatty acids, glycerol and triglycerides?
  • Can you compare the use of carbohydrates and lipids in energy storage?

If you can answer yes to all of the above questions, you are ready to move on….

In this section we’ll use this great presentation, and we’ll also be doing a lab. Lab – Comparison of chemical composition of food

Then we’ll need to venture into our first bit of higher level material on protein structure.  This may also be useful: Proteins AHL