Tag Archives: podcast

Step Up to 2017!

sparkling trails of light drawing out the numbers 2017 in glowing light to welcome in the new year

Welcome to the step up week for Year 12 Biology in 2017. This post is to let you know about some of the resources that are available for your studies. It is a new course for Unit 3 and 4 next year and we will be using the Heinemann textbook (3rd edition). You will also need a copy of the Heinemann Student Workbook for practical activities and revision questions.

The Hawkesdale Biology Quizlet page is where you can access learning activities for each Chapter to assist you with key terms and definitions. Please sign up to Quizlet and join the class.

Andrew Douch is a very experienced VCE Biology teacher who produces free weekly podcasts (Douchy’s Biology Podcasts) that are worth listening to. He also has a popular Facebook page where you can ask questions.

Mr Barlow has produced four apps, one for each Biology unit, which are available on iTunes. You may find these useful for revision.

Unit 3 – Area of Study 1 – How do cellular processes work? 

Outcome 1: On completion of this unit the student should be able to explain the dynamic nature of the cell in terms of key cellular processes including regulation, photosynthesis and cellular respiration, and analyse factors that affect the rate of biochemical reactions.

Unit 3 – Area of Study 2 – How do cells communicate?

Outcome 2: On completion of this unit the student should be able to apply a stimulus-response model to explain how cells communicate with each other, outline human responses to invading pathogens, distinguish between the different ways that immunity may be acquired, and explain how malfunctions of the immune system cause disease.

Unit 4 – Area of Study 1 – How are species related?

Outcome 1: On completion of this unit the student should be able to analyse evidence for evolutionary change, explain how relatedness between species is determined, and elaborate on the consequences of biological change in human evolution.

Unit 4 – Area of Study 2 – How do humans impact on biological processes?

Outcome 2: On completion of this unit the student should be able to describe how tools and techniques can be used to manipulate DNA, explain how biological knowledge is applied to biotechnical applications, and analyse the interrelationship between scientific knowledge and its applications in society.

Unit 4 – Area of Study 3 – Practical Investigation

Outcome 3: On the completion of this unit the student should be able to design and undertake an investigation related to cellular processes and/or biological change and continuity over time, and present methodologies, findings and conclusions in a scientific poster.

Enzymes – catalysts of digestion!

Photo Source

These pitcher plants and other ‘carnivorous’ plants produce digestive enzymes that can break down the flesh of small invertebrates, such as flies, spiders and ants. Often they grow in soil that is deficient in specific inorganic nutrients, such as nitrates and phosphoros, and can get these essential elements from the dead animals that are attracted by sweet and sticky liquids.

The main things to remember about enzymes are:

  1. Enzymes are proteins and biological catalysts.
  2. They are not used up in the reaction – only a small amount of enzyme is needed for each reaction.
  3. They do not change the amount of product formed
  4. They speed up a reaction, but do not change the direction of the reaction.
  5. They are very specific to their substrate and are often named according to the chemicals they work on.
  6. Enzymes, being proteins, are sensitive to heat, pH and heavy metal ions. When heat is applied the proteins are ‘denatured’ and no longer work. 

In the human body there are several different enzymes including:

  • Amylase which works on starch
  • Maltase which works on maltose
  • Sucrase which works on sucrose
  • Lipasewhich works on lipids (Fats) and
  • Pepsin which works on polypeptides (Proteins)

More about Enzymes from Wikipedia here. Award-winning Enzyme Investigation here. Andrew Douch, a Biology teacher from Wanganui Secondary College, has produced many Biology podcasts, for students to learn about different topics – here is a link to his “Enzymatic” podcast. Andrew has also included some notes about enzymes here. Experiment with enzymes in liver here.