An Investigation to Show the Effects of Changing Temperature in Yeast Respiration

An Investigation to Show the Effects of Changing Temperature in Yeast Respiration

Length: 848 words (2.4 double-spaced pages)

Rating: Good Essays

Open Document

Essay Preview

An Investigation to Show the Effects of Changing Temperature in Yeast Respiration

Brief

Investigate one of the variables that effect respiration in yeast.



Background Knowledge
====================

Yeast is one of the various single celled fungi that form masses of
miniature circular or oval cells by budding. When placed in sugar
solution the cells multiply and convert the sugar solution into
alcohol and carbon dioxide. Yeasts are used as fermenting agents in
baking, brewing and the making of wine and spirits. Brewers yeast is a
rich source of vitamin B.

Respiration in yeast is the production of the energy in the
mitochondria of the cells. There are 2 types of respiration, Anaerobic
and aerobic. At first aerobic respiration will be present but only
until the oxygen that is already dissolved in the water. When the
oxygen is used up anaerobic respiration will be present which produces
the alcohol. The word equation for anaerobic respiration in yeast is:


Glucose Alcohol + Carbon Dioxide + Energy
-----------------------------------------


Anaerobic respiration is different in humans than it is in yeast
because we break down glucose into lactic acid whereas yeast breaks it
down into alcohol.


Input Variables


There are several different variables in this experiment such as:


The temperature of the water


Amount of Water
---------------

Amount of Yeast

Amount of sugar

The time it is left for


In this experiment I will be changing the temperature of the water.



Prediction
==========

I predict that the hotter the water is the more carbon dioxide bubbles
will...


... middle of paper ...


...
reason why my test was accurate was that we used a thermometer to
check the temperature that is an accurate means of measuring heat. It
would have been even more accurate if we used an electronic
thermometer.



Improvements to Plan
====================

The only major improvement that I think would have been useful would
be to increase the temperature by only 5 C each time instead of 15 C.
This would help us to get a more accurate measurement of when the
yeast respires best. If I had more time I would have done this and
would have been able to find the optimum temperature for the yeast.
Another improvement would have been to measure the amount of carbon
dioxide given off instead of counting the bubbles. This would have
been a good improvement as bubble sizes change, they are never the
same size.



Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

An Investigation to Show How Water Temperature and Alcohol Concentration Affect Membrane Permeability

- An Investigation to Show How Water Temperature and Alcohol Concentration Affect Membrane Permeability Aim The aim of the experiment is to show the cell’s membrane permeability is affected by being placed into different temperatures of water. Also the effect of placing beetroot in to different concentrations of alcohol. Beetroot cells contain a red sap, which leaks out of the cells if their membranes are damaged or altered. Cell membranes are made up of a bilayer of phospholipids, which also contains proteins....   [tags: Biology Lab Report]

Good Essays
851 words (2.4 pages)

Essay about Investigation of Whether Temperature Affects Enzyme Activity

- ... 6. Repeat the stages but changes the temperature of the water used. Apparatus and Materials 1. Bunsen Burner 2. Tripod 3. Gaze 4. Heat Mat 5. Lab Coats 6. Safety Glasses 7. Heavy Duty Beakers 8. Thermometers 9. Black Card 10. 2 per boiling tube 11. 2 per small beakers 12. Test Tube Rack 13. Stopwatch Data Collection & Processing Recording Please see the table on the next page Calculation of the average (values of repeated numbers /4) Calculation of the rate (1/average) ×1000 Table Description On the lined piece of paper is the data that I recorder during the experiment....   [tags: molecules, experiment, reaction]

Good Essays
832 words (2.4 pages)

Investigation of the Factor that Affects the Change in Temperature Between Iron and Copper Sulphate

- Investigation of the Factor that Affects the Change in Temperature Between Iron and Copper Sulphate In this investigation I am going to investigate a factor that effects the change in temperature between copper sulphate solution and iron filings. The variable involved in this investigation are: · The volume of copper sulphate · The mass of iron filings added · Rise in temperature · Concentration of the copper sulphate In this in investigation my input variable that I am going to change will be the mass of iron filings that I will place into the copper sulphate solution to see how the change in mass effects the rise in temperature of the solution....   [tags: Papers]

Free Essays
2236 words (6.4 pages)

The Effects of Temperature on the Rate of Clotting Milk and Rennet Essay

- The Effects of Temperature on the Rate of Clotting Milk and Rennet Introduction ------------ The following experiment investigates the effects of different temperatures on a mixture of rennet and whole milk. On having the choice between testing the mixtures reactions at various temperatures, or testing the mixture with various amounts of concentration of rennet, my partner and I decided upon the first option. We made this decision as we felt it would be valuable to our scientific knowledge if we had a better understanding of how different temperatures can effect the behaviour of an enzyme, such as Rennin, which is also known as Chymosin....   [tags: Papers]

Free Essays
2841 words (8.1 pages)

Investigation on Enzymes Essay

- Investigation on Enzymes Introduction Sam and Sarah planned and carried out an experiment to see the effect of pH on the activity of the enzyme amylase which breaks down starch into sugar. They decided to investigate 5 different pH's 2,4,6,8 and 10. 1. The used a measuring cylinder to measure out 5cm3 of starch and placed it in a test tube. They then added acid or alkali until they got to pH2. They checked this using indicator paper 2. They placed the test tube in a rack on the bench and added 5cm3 of amylase which they had also measured using a measuring cylinder....   [tags: Papers]

Free Essays
730 words (2.1 pages)

Essay on An Investigation Into a Reaction Catalysed by a Protease

- An Investigation Into a Reaction Catalysed by a Protease Aim. To investigate the effect of temperature and the effectiveness of this enzyme in breaking down the gelatine (protein) on the back of photographic film. Prediction I predict that the effect of the temperature will be that the higher the temperature the quicker the enzyme will break down the gelatine, but the temperature will have to be an optimum temperature because if it is too high, the enzyme will be denatured....   [tags: Papers]

Free Essays
968 words (2.8 pages)

Investigation into the Digestion of Milk by Trypsin Essay

- Investigation into the Digestion of Milk by Trypsin Background Knowledge ==================== To investigate the effect of trypsin on milk a number of separate experiments will be performed whereby milk is digested by trypsin under controlled conditions. Specific variables will be changed by calculated amounts to gauge their individual effects on the rate and amount of reaction that occurs. Trypsin is a biological catalyst, (a substance that speed up a reaction without being used up or changing the reaction in any way), known as an enzyme that is found in the human body....   [tags: Papers]

Good Essays
2745 words (7.8 pages)

An investigation into concentration and rate of reaction Essays

- An investigation into concentration and rate of reaction Aim: to determine the effect on rate of reaction of changing the concentration of sodium thiosulphate in the reaction sodium thiosulphate + Hydrochloric acid -> Sodium Chloride + sulphur dioxide + Sulphur + water. Scientific background A reaction is a change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances. The particular reaction of sodium thiosulphate + Hydrochloric acid -> Sodium Chloride + sulphur dioxide + Sulphur + water or Na2S2O3 + 2HCl -> 2NaCl + SO2 + S + H2O....   [tags: Papers]

Free Essays
1198 words (3.4 pages)

Resistance of a Wire Investigation Essay

- Resistance of a Wire Investigation Introduction In this investigation I will carry out an experiment to distinguish how the length of a wire, disrupts the behaviour of the resistance. Throughout this investigation I will include my prediction, method, diagram, results and a graph to show the relationship between the length of the wire and the resistance. Remember that resistance occurs when the electrons travelling along the wire collide with the Ions of the wire. Also remember when the resistance is increased, the current will decrease....   [tags: Papers]

Free Essays
1656 words (4.7 pages)

Essay about Bay Pond Investigation

- Bay Pond Investigation Planning: Aim: To compare the diversity and amount of organisms in two different ponds (Peter’s Pond and Bay Pond). Variables: I will be comparing two ponds with different amount and variety of species in them. During this field trip the independent variable will be the different ponds (i.e. Peter’s pond and Bay Pond) and the dependent variable will be the number of species and organisms in the two ponds. In addition, I will be looking at the pH, temperature, depth and the turbidity of the pond (the abiotic factors) to see whether these aspects have an effect on the presence of the organisms as I predict that there will be a relation...   [tags: Papers]

Free Essays
2096 words (6 pages)