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Science Essay Examples

How temperature will effect the speed in which the enzyme Catalase will react with Hydrogen Peroxide

Individual enzymes are named by adding ase to the name of the substrate with which they react. The enzyme that controls urea decomposition is called urease; those that control protein hydrolyses are known as proteinases. Some enzymes, such as the proteinases trypsin and pepsin, retain the names used before this nomenclature was adopted. * They…

The effect of temperature on the hydrolysis of starch using amylase extracted from barley

Enzymes are a class of proteins that catalyse chemical reactions, which increases the rate of a metabolic reaction. Most enzymes are specific, working on a particular or class of reactions. In this case I am using an enzyme known as amylase (a group of enzymes which convert starch to sugar), which is an important metabolic…

Effect of concentration of copper sulphate on the action of amylase to break down starch

There are two ways that we could have consumed copper sulphate. Water pipes are responsible for transporting water, and some of them are made out of copper. Copper pipes can become rusted if there is high sulphate content in the water, basic copper sulphate is precipitated which can grow through the pipe wall creating pit…

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Enzyme Experiment with Temperature

Enzymes are catalysts in the body that speed up the breakdown of food, and are essential in the digestive system. Although food can be broken down by molecules colliding with it, the process is speeded up greatly by enzymes, a type of catalyst. We know from previous knowledge that enzymes are proteins, and they require…

How different concentration of enzyme catalase affects the rate of breaking down substrate hydrogen peroxide

Enzymes are large proteins that speed up chemical reaction. As globular protein, enzymes have a specific three-dimensional shape which is determined by their sequence of amino acids. Despite their large overall size, enzyme molecules only have a small region that is functional. This is known as enzyme’s active site. The substrate molecule is held within…

The role of the skin, lungs and kidneys in excretion

Report that evidences a cognition and apprehension of the function of the tegument,lungs and kidneysin elimination. How is urine produced? Harmonizing to Innerbody ( 1995-2015 ) , urine is produced by the critical urinary system within the human organic structure which comprises of the urinary vesica, the urethra, ureters and the kidneys. The kidneys occupation is…

Does the river Alyn follow Bradshaw's model?

Channel Shape – This is described by hydraulic radius. This is the ratio between the cross sectional area of a river and its wetted perimeter. For example if two rivers have an equal cross sectional area the river with the greater wetted perimeter will have more friction and so the velocity will be less. River A…

Continental Drift

First proposed by Alfred Wegener the meteorologist, the theory of continental drift supports the belief that the Earth’s continents once were a single land mass. This land mass, which was named “Pangaea”, broke up, and its various parts drifted away from one another. Centuries ago, trips around the world from travellers showed out lines from every…

The megathrust earthquake

Chile is hit by what is called a megathrust temblor. Chile lies on a convergence or destructive home base boundary. This means that to different home bases, in this instance the Nacza home base ( an pelagic home base ) and the South-American home base, travel towards each other. In this boundary, the home bases…

Enzyme-linked immunosorbent assay (elisa)

Enzyme-Linked Immunosorbent Assay ( abbreviated as ELISA ) , is a sort of immunochemical assay technique to observe the presence of a specific antibody or antigen in the trial samples. This method chiefly make usage of both immunological reaction ( the antibody-antigen reaction ) to observe the nowadays of specific antibody or antigen ) and…

Confounding Variables

This bar chart shows participants recalled less amount of words (vertical axis) from List A in the same context (horizontal axis), compare to amount of words recalled in List B, different context. This rejects the directional hypothesis which stated participants would be able to recall more words in the same environment by using same context…

Climate Zones Essay

The word is divided into 6 clime zones. These zones depend on several factors. The first is temperature ; if a state lies near the equator it tends to be hot ; but if it’s near the poles it tends to be colder. A state can besides hold a cold clime if it’s really cragged…

Natural Tendency To Do Good

Being around different people can make a human behave or act in ways that they normally would not. This is true in many possible ways and experiences that people go through. Mencius said, “Persons may be brought to do evil, and that is because the same is done to their nature. ” This shows that…

Investigation of Photosynthetic Pigments in Spinach

Investigation of Photosynthetic Pigments in Spinach Michael Yacoub BIOL&211 Lori Hayes Introduction: Purpose: To demonstrate the existence of the pigments of photosynthesis in spinach by separating them using chromatography, then measure them using spectrometry. There are multiple pigments in photosynthesis, the varying pigments allow the plant to absorb light at various wavelengths which allows the…

Combined solution of Garlic (Allium sativum) and Lemongrass (Cymbopogon citratus) Essay

The survey is entitled Combined solution of Garlic ( Allium sativum ) and Lemongrass ( Cymbopogon citratus ) . Specifically. it sought to happen out how these two solutions ( lemon grass and Allium sativum ) can efficaciously kill mosquitoes. It aimed at looking for an organic and safe step in handling the copiousness of…

Anaerobic reaction of yeast

I am going to investigate the anaerobic reaction of Yeast. Anaerobic respiration requires: Glucose ==> Co2+Alcohol. Whilst Aerobic respiration, which we use to breathe, requires: Glucose + Oxygen ==> Co2+H20+ heat energy. To observe and record results of this reaction I will measure the amount of Co2 this experiment produces. There are a number of…

Factors affecting cooling rate

Heat energy is conducted from the hot end to the cold end. It is transferred from atom to atom. At the hot end the atoms are vibrating a lot. The vibration is gradually passed along to the other atoms as they collide into each other. This happens in all substances, but in a metal something…

Does Caffeine Affect the Heart Rate

Aim: The aim of this investigation is to investigate the affect of caffeine on the heart rate of Daphnia (Water Fleas). Hypothesis: The heart rate of the Daphnia will increase when exposed to caffeine. Caffeine acts as a stimulant, which causes stimulatory neurotransmitters to be released in excess amounts. This makes the brain feel more…

We are trying to find out what insulator is the best from cotton wool, bubble wrap and plastic foam

Plan: The factor I will be changing is the type of insulator. The factor I will be recording is the temperature of the water in degrees for a total of six minutes. To record the temperature I will use a thermometer. The factors I will keep the same so it is a fair test are:…

The Factors Influencing The Mpemba Effect

The Mpemba Effect is a phenomenon in which hot H2O freezes faster than cold H2O. This phenomenon was discovered in Tanzania, Africa, by a high school pupil named Mpemba. ( Kurtus ) Conduction, convection, radiation, and vaporization are methods through which heat can be transferred from one substance to another and are necessary in understanding…

Compare And Contrast B Cells And T Cells Biology Essay

The epithelial surfaces of the organic structure service as an effectual barrier against most micro-organisms, and they are quickly repaired if wounded. Adaptive unsusceptibility is initiated when an innate immune response fails to extinguish a new infection, whereby an activated antigen showing cells ( APCs ) bearing pathogen ‘s antigens are delivered to the run…

Biology on Surface Area to Volume Ratio Essay

As we all know. many chemical reactions go on within both unicellular and multicellular beings. Many utile substances have to spread into different cells in order to assist supply the necessary energy needed for these reactions to go on. at the same clip. the waste merchandises produced after these reactions have taken topographic point have…

Determination of molarity of cell sap in potato tubers

Plant and animal cells are made up of a cell membrane. The plant cells have the cell membrane line in the inside of the cell wall. The cell wall provides the turgidity to the cell. The cell wall is dead and allows all substances to pass freely through it whereas the cell membrane is alive…

Fruits to make a fruit battery

Magnesium, due to its reactivity, has a very high potential energy, so the electrons travel from it to the copper, which has a very low potential energy due to its unreactivity. The difference in the potential is called the cell potential difference. If the difference of potential energy is large, then clearly the voltage produced…

The effect of temperature on a squash ball

I did a preliminary experiment to see if my method would work and if there were any problems with the way I will conduct my experiment. Preliminary Results Temperature (i?? C) Distanced Bounced (Cm) 90 81 40 68 0 20 Factors affecting my experiment If I use different squash balls of different elasticity it will…

Osmosis Essay

Osmosis is a form of passive transport, and a specialised form of diffusion. It is the movement of water from a dilute solution to a more concentrated one, through a semipermeable membrane. Hence it is where water moves from a high to a low concentration. I will design an experiment to test this process on…

The neutralisation of Acids by Antacids

An Investigation to See What Effects the Neutralisation of Acids by Antacids In this experiment I will be looking at what affects the rate of reaction in a chemical reaction between Hydrochloric acid and commercial antacids. I will be looking at one of the Rates of reaction, surface area, to see if a smaller surface…

Propanol and Butanol

To investigate and compare the relationships between the amounts of energy released from different alcohols in the alcohol series. BACKGROUND INFORMATION Alcohols are a series of organic homologous compounds with the general formula of C(n) H(2n+1) OH. They gain their properties, which are different to those of other compounds in the homologous series due to…

Concentration and rates of reaction

I am investigating the effect of the concentration of Hydrochloric Acid on the speed of the reaction between Sodium Thiosulphate and Hydrochloric Acid. When these react together, sulphur is formed. A balanced chemical equation for the reaction is… Na2S2O3 + 2HCl –> S + 2NaCl + SO2 + H20 Apparatus Total of 10cm3 of distilled…

Constantan and Nichrome

If the length of the wire is doubled, the electrons bump into twice as many ions so there will be twice as much resistance. I’m going to summary my prediction to make it very clear. Longer the wire the more resistance the material has to electrical current compared to the short wire. This is so…

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