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The Effect Of Varying Enzyme Concentration On The Breakdown Of Hydrogen Peroxide In The Presence Of Catalase
Grade: 18/18 Words: 3000
Hypothesis – Hydrogen peroxide will breakdown to oxygen and water in the presence of Catalase.  The reaction will increase with increasing enzyme concentration when molecules of hydrogen peroxide are freely available.  However, when molecules of the [...]

Aim
To investigate some of the properties of immobilised enzymes.
Introduction
The four-session practical exercise is designed to give some insight into the preparation and properties of immobilised enzymes. 
It consists of three parts:

Preparation and properties of covalently-immobilised a-amylase. 
Preparation and properties of non-covalently-immobilised a-amylase.
The use of a packed-bed and stirred tank reactor.

 
Before starting work, read through the Methods and [...]

This is an AS Level Biology Essay
OUTLINE THE MAJOR FEATURES OF MENELIAN GENETICS. DISCUSS THE ROLE OF CHROMOSOMES IN EXPLAINING THESE PRINCIPLES.
Gregor Mendel was an Augustinian nineteenth century monk who, due to a series of momentous experiments, is now widely regarded as the forefather of genetics.  Mendel studied the inheritance of seven contrasting characteristics of [...]

Prediction
In this section I will look at all the factors involved in the rate of reproduction of yeast cells, bring them together at the end of the section and deduct a scientific conclusion as to what I would expect to happen.
Yeast Cell Respiration
Yeast cells, like any other organism, need a substrate to respire.
Respiration in general
In [...]

In this section I will discuss the factors relevant to the prediction.
Succession
This is the process in which communities of plant and animal species are replaced over time by a series of different and usually more complex communities. It is driven by interspecific competition and an important aspect of it is that at each of the [...]

The effect of substrate concentration on the rate of decomposition of hydrogen peroxide when catalyzed by the enzyme catalase
[I am aware that there may be errors in this document- I did it years ago. Please notify mo of them so that I can correct them.]

Answering questions correctly makes all the difference. Here are some model questions and answers collected from previous papers and their mark schemes.
4.1 Sense Organs
The Eye
(Given with graph)
Describe and explain how the distribution of the rod cells and cone cells relates to variation in sensitivity and visual acuity in different parts of the retina
(BY04 June 96 [...]

The gut or alimentary canal can be considered as an extension or inversion of the epithelium or outer skin, as it is physiologically not part of the body. It runs from the mouth from the rectum, and varies in thickness. It has the following functions (comments in brackets for my Yorkshire-born counterparts):

Ingestion (eetin’ an’ swallowin’ [...]

This Essay was awarded a mark of A, so they say.
Only the plan is included
For this investigation I am going to investigate the effect of the concentration of an enzyme, in this case Amylase, on the time taken for the enzyme to fully breakdown the substrate, which in this case is starch. The reason why [...]

Presented with raw potato how would you carry out an experiment to determine the concentration of the potato cell in molar strength?
The experiment was set up to be as fair as possible. Then the potato chips were cut into 15 cylinders using a cork cutter and then cut to a length of exactly 4cm [...]