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This was the reason why the experiment never took place. Empty reply does not make any sense for
the end user Submit reply Cancel Report this resource to let us know if it violates our terms and
conditions. Catalase is present in the blood and prevents a build of dangerous peroxide. It is also a
brilliant strategy for retrieval practice with year 10’s who have completed this topic last term and
need to keep the knowledge fresh in their mind. It changes the properties of the amino acids or the
co-factors that are involved in the catalytic activity of the enzyme. Our customer service team will
review your report and will be in touch. ?1.00 (no rating) 0 reviews BUY NOW Save for later ?1.00
(no rating) 0 reviews BUY NOW Save for later Last updated 13 April 2020 Share this Share through
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Biology Bare 4.63 645 reviews Not the right resource. Content for higher is different to the
foundation paper, so please check which content you need to revise:). The active site breaks down
the substrates by affecting the substrates bond of electrons. Even if a slight change in pH is not
enough to denature the molecule, it may upset the delicate chemical arrangement at the active site
and so stop the enzyme working. They are made up from a long chain of amino acids folded in upon
itself until it has a cleft in the exact shape and size of the molecule it was designed to act on, this
makes enzymes specific to one reaction - an enzyme with an active site the shape of starch molecules
can't act upon hydrogen peroxide molecules. Exam question would be good to go along with these
for added benefits. It was faster than the others due to the possiblity that there was too little starch
or too much enzyme. If I were to do this experiment again I would do the following changes: I
would have a control as it helps explain what is taking place between enzyme and pH buffer
solutions. The slide following these questions offers a marking scheme so students may self-assess.
The procedure was repeated three times to ensure the results would be reliable and so we could
identify any anomalous results. Get this resource as part of a bundle and save up to 36% A bundle is
a package of resources grouped together to teach a particular topic, or a series of lessons, in one
place. Enzymes themselves only catalyse chemical reactions and do not alter the actual reaction, they
also increase the rate of reaction. Our customer service team will review your report and will be in
touch. ?2.00 (no rating) 0 reviews BUY NOW Save for later ?2.00 (no rating) 0 reviews BUY NOW
Save for later Last updated 27 September 2022 Share this Share through email Share through twitter
Share through linkedin Share through facebook Share through pinterest Empirical Tuition 4.50 236
reviews Not the right resource. For example when I am adding the amylase to the starch and starting
the stopwatch. A2 Biology Coursework -Investigation into the effect of different concentra.
Temperature- I will keep the temperature used all the time at 30oC, because if I do change the
temperature then it can affect my whole experiment. This graph also proves my prediction correct
which was that the enzyme Trypsin would work good in alkaline pH's and it has, as the %
transmission is higher in an alkaline pH. Trypsin is one of a group of proteases that is secreted by the
pancreas, which is in the upper (small) intestine. Where the problems occur medical attention must be
on hand. Please rate these resources and follow me for upcoming revision mats for the other areas of
the specification. ?6.49 Reviews Select overall rating (no rating) Your rating is required to reflect
your happiness. This was the reason why the experiment never took place. So to make this
experiment a fair test I shall keep the same amount of. I have used the crucial information from the
textbook( OCR A Biology ISBN- 978-0-19-835192-4) to create this resource. It changes the binding
of the substrate to the enzyme. Write a review Update existing review Submit review Cancel It's
good to leave some feedback.
Because I kept these points as my constants my experiment was therefore a fair test. This
invesigation was used to observe the reaction between starch and amylase to Maltose. Now I will
take a paper towel and clearly label it Hydrogen Peroxide, I will place my 50cm. The other problem
that I encountered was that because I was using a colorimeter, I had to place approximately 1-2cm3
of my solution that was reacting in covets. If I were to do this experiment again I would do the
following changes: I would have a control as it helps explain what is taking place between enzyme
and pH buffer solutions. Content for foundation is different to the higher paper, so please check
which content you need to revise:). Also if further pH’s were used after 9 these could be plotted on
the graph to summon up the evidence to draw a firm, sound conclusion on what I have proved. See
other similar resources ?0.00 (no rating) 0 reviews Download Save for later Not quite what you were
looking for. Without the water baths we could not have six different temperatures and could not test
the effect of temperature on the enzyme, amylase. Includes notes on: Carbohydrates, Lipids,
Proteins, Enzymes, Nucleic Acids, ENergy and ATP and Water. Enzymes are known as Biological
catalysts as they speed up reactions in living systems. Within the enzyme there is the active site,
which has a specific shape where reactions occur. Write a review Update existing review Submit
review Cancel It's good to leave some feedback. If a small piece of liver is added to hydrogen
peroxide a rapid evolution of oxygen is seen. To make sure the measurements were exact I would
have had to use equipment such as a microtome. This will help to cut down on the margin of human
error. From 120 seconds to 180 it goes down but at 210 seconds we see that the % transmission goes
up to 80 this shows that the solution is getting clearer again. Trypsin is one of a group of proteases
that is secreted by the pancreas, which is in the upper (small) intestine. This increases the amount of
enzymes present and so increases the number of collisions between the enzymes and substrate (which
fits the enzyme exactly). See other similar resources ?1.99 (no rating) 0 reviews BUY NOW Save for
later Not quite what you were looking for. This is to do with the solutions I am using; further
explanation will be given when the real results are shown. Therefore my aim will be: Aim: I am
investing the effect of pH on the activity of the enzyme Trypsin; this is when this enzyme reacts
with the substrate Caesin. This can also be used as home learning for students if they are requested
to isolate for two weeks. Labels- this is used to distinguish between the solutions that were used, I
placed labels on the syringes so that I would not get it mixed up with other syringes, this would help
me stop affecting the reaction. Keep the test tubes in there until reached the temperature required. 3)
When the three test tubes of solutions are at the right temperature you can then start the reaction by
mixing them altogether into a boiling tube, but immediately start the stopwatch when all the
solutions are mixed. The enzyme function can be slowed down or even stopped by inhibitors. The pH
at which enzymes work best at is 7 (neutral). All of these precautions will ensure safety to me and
those surrounding me throughout my investigation. Here is a graph to show the effect of change in
pH on enzyme activity: As you can see, that in certain pH's the enzymes will work. Make sure you
use different syringes so there is no coss-contamination of substances. It also proved that as the
starch concentration increases the rate of reaction increases too.
The conclusion was explained well using scientific theory. Reviews Select overall rating (no rating)
Your rating is required to reflect your happiness. I would have to have more time in order to not rush
and so avoid anomalous results. But the Trypsin that I used was a proteolytic enzyme that was
extracted from a Bovine pancreas. The graph for 12 discs is also a lot steeper than the graph for 6
potato discs showing that the reaction went faster due to there being more active sites open to
catalyze the reaction and consequently more chance of collisions between the enzymes and the
substrate. If one potato disc was thicker than the rest, it would have more surface area, the extra
surface area would increase the amount of enzymes, providing more active sites and so speeding up
the reaction. Download Ebook Biology Biochemistry Understanding Enzymes Answer Key Biology
Biochemistry Understanding Enzymes Answer Key The second edition of this book on lipids
lipoprotein and membrane biochemistry has two major objectives - to provide an advanced textbook
for students in these areas of biochemistry and to summarise the field for scientists. The hydrogen
bonds and the ionic forces maintain the enzyme itself, and so their function can be affected by the
changes in temperature and also changes in pH can affect their function. I also predict that as the
starch concentration is increased so will the rate of reaction. Colorimeter- this is used to measure the
percentage transmission of the reacting solution, what I mean by the percentage transmission is that
the colorimeter measures the amount of light that can pass through a solution. Therefore it is likely
that there were slightly fewer enzymes in the potato disks I used in the nine discs experiment than
the 6 discs experiment and slightly fewer enzymes in my 12 discs experiment than in my 9 and 6
discs experiments. But when you look at how the enzyme Trypsin works at the molecular level, you
can see that this enzyme is specific. These are great tools for use as homework after the students
have performed the required practical or for revision before any assessments and their exams. I
predicted that the graph would be of a shape as shown below. Metabolic control pH and enzyme
kinetics ran closely behind with notable mention given to molecular biology and Page 1652. From all
of the graphs you can see that for all the pH's the results are curves of different kinds. Trypsin is one
of a group of proteases that is secreted by the pancreas, which is in the upper (small) intestine. Also
the potato I used could affect the reaction rates. I did not have the required equipment for any of
these improvements. Exam question would be good to go along with these for added benefits. As I
have 6 different concentrations my results will be reliable, as they will spread out equally over a
large range. They contain questions about methodology, scientific enquiry and analysis of results.
You can see that the line is less curvy and more straight this shows that the reaction must have taken
place very quickly, in that graph you can also see that the error bars are small so it shows that I have
been more accurate than before, as the error bars have decreased. I could say that because of these
difficulties I got anomalies in the results. But after looking at my results in detail I then understood
that my results are correct and fairly accurate. As I will be using water to clean the used apparatus
after I test each concentration twice, I will make sure not to spill any water on the floor as it could
create a slipping hazard to myself and those around me. This increase in collisions increases the
reaction speed. Very useful as revision notes and includes important information highlighted in
colours. Bundle AQA A LEVEL Biology notes for BIOLOGICAL MOLECULES Detailed notes on
the 3.1. section of the NEW 7402 A LEVEL SPECIFICATION for Biology. Enzymes themselves
only catalyse chemical reactions and do not alter the actual reaction, they also increase the rate of
reaction.
