Science Essays

The human embryo is a collection of clusters of non-specific cells, which then develop into the tissues of the adult human. In particular immature, non-specific neuroblasts must be differentiated into the highly specialised cells of the nervous system, each with a unique structure, function and synaptic interactions (Whatson 2004). The …

Aim of the Experiment: To analyse the effects of light intensity on photosynthesis via the Hill reaction. Research Question: How does light intensity affect the rate of photosynthesis more precisely the rate of reaction in photosystem II, at the primary acceptor location? Hypothesis: In the light dependant reactions, an artificial …

1. All living things are made up of cells 2. Cells are the smallest unit of life 3. All cells arise from pre-existing cells 1. All living things are made up of cells which have an outer boundary, nucleus, cytoplasm and organelles. However there are many exceptions to this rule. …

Defining problem and selection variables Purpose: The purpose of the experiment is to show how varying the concentration of salt solution affects osmosis in a potato piece. Background: * Osmosis: Diffusion of water molecules across a membrane from high concentration to low concentration. (Biology, Sixth edition – Campbell, Reece) * …

ATP, or Adenosine triphosphate, is an organic chemical compound that has a strong chemical bond which acts as an energy fuel, it isn’t a long term energy store as the bond is quite unstable so when ATP is made it is used almost immediately, when this bond is broken it …

a) Draw a diagram to show the structure of the human brain. b) Outline the function of the following regions of the human brain: medulla oblongata, cerebellum, hypothalamus, pituitary gland, cerebral hemisphere. Medulla oblongata: The medulla oblongata contains the neural centres of the autonomic nervous system and therefore controls automatic …

Introduction: Background: There are many nutrients that are present in an organism that provides it energy in order to grow and reproduce. Some nutrients are required in larger amounts compared to others. These nutrients, that are required in larger amounts, are known as macromolecules. Identifying and distinguishing these macromolecules can …

Electrolytes are nutrients that affect the fluid balance in our bodies and are required for the nerves and muscles in our body to function. When electrolytes dissolve, they produce ions that carry electrons from one electrode to another. The more soluble a substances is, the stronger the electrolyte is. The …

There are two types of error which occur in measurements: 1. Random Errors Random errors or uncertainties cause repeat measurements to vary and be scattered around a mean value. Averaging a number of readings helps to reduce random uncertainties. Precision Precise measurements have a small random uncertainty. Measurements are more …

Aim: My partner and I would like to investigate the solubility of different chemicals when placed into 25cm3 of water. Hypothesis: I think that sugar will be the most soluble chemical. By this I mean that the sugar will be able to dissolve in the water even after 12 spatulas. …