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Need Bio p3 and p5 Nov 1999------URGENT PLZZZZ!!!!
- Thread starter lushpush
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why do u need these???
i have these and can send them to you but tell me why u need them!
i have these and can send them to you but tell me why u need them!
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I need em 2~!!!!!
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why does everyone all of the sudden want this paper...?
send me a copy too plz!!!
send me a copy too plz!!!
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zahraahmed, please the send the copy to me as well on [email protected]
can anyone please send me too....i need bio paper 3 and paper 5 of the year 1999 and 1995....plz send me them on [email protected]
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why is it so important???
send to my email please. [email protected]
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hey guys i too need it .zahraahmed....can u send it to me too. ............ [email protected]
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u wont find such old papers onlinelushpush said:
chk topical books!it will be there
plzzz i also want these papers plzzz send me also m realli worried abt praticals as im givng it for the first time m damn nervous help mee send mee also my id is [email protected].....
plzz help meee send it to mee these papers tooo urgent i really need help in bio praticalss id [email protected]
plzzz send me [email protected]
i m damn nervous...plxx send meee
i m damn nervous...plxx send meee
hassam u forward me fast plzzzzzzzzzz help meee my di [email protected] i cant evn pm u....
Hey all.. Yhe 4 2mrw We might have Urease... N Transverse Section of leaf.. Hopefully..
http://www.scienceinschool.org/print/607 a link realted to enzymes urease.....
http://www.scienceinschool.org/print/607 a link realted to enzymes urease.....
Ok Duh we're getting urease & urea tomorrow in Bio 33, Now what wud be the Improvements, Sources of error & Limitations for the experiment below?
Enzyme Concentration
In this investigation, we will examine what happens to the rate of a reaction when the amount of enzyme is reduced. We will use urease, an enzyme that converts urea to ammonia. The ammonia causes the pH of the water to increase (it becomes more basic). You will be able to tell when a reaction occurs because the urea solution also contains a pH indicator that is becomes yellow in acid but turns red when the solution becomes basic.
The object of this experiment is to measure the amount of time it takes for the solution to turn red if less enzyme is used.
C1. Create a hypothesis regarding the the amount of urease and the rate of reaction of Urea.
C2. Obtain four test tubes and add 2 cm of urea to each.
C3. Label three of these tubes 1 through 3; the remaining tube will not be used; it will serve as a control.
C4. Have your lab partner start timing as you add 15 drops of urease to tube #1 and then swirl the tube until it changes to a red color. Record the amount of time that it took for the urease to change to a red color.
C5. Add 5 drops of urease to tube #2 and then swirl the tube until it changes to a red color. Record the amount of time that it took for the urease to change to a red color.
C6. Add 1 drop of urease to tube #3 and then swirl the tube until it changes to a red color. Record the amount of time that it took for the urease to change to a red color.
C7. Record your results in the answer sheet.
C8. Did using less enzyme produce a reaction?
C9. What was the effect of using less enzyme in your experiment? If your experiment did not work as expected, what should have happened?
C10. In general, what happens to the rate of reaction as the amount of enzyme is decreased?
C11. Do your results support your hypothesis? Explain.
Enzyme Concentration
In this investigation, we will examine what happens to the rate of a reaction when the amount of enzyme is reduced. We will use urease, an enzyme that converts urea to ammonia. The ammonia causes the pH of the water to increase (it becomes more basic). You will be able to tell when a reaction occurs because the urea solution also contains a pH indicator that is becomes yellow in acid but turns red when the solution becomes basic.
The object of this experiment is to measure the amount of time it takes for the solution to turn red if less enzyme is used.
C1. Create a hypothesis regarding the the amount of urease and the rate of reaction of Urea.
C2. Obtain four test tubes and add 2 cm of urea to each.
C3. Label three of these tubes 1 through 3; the remaining tube will not be used; it will serve as a control.
C4. Have your lab partner start timing as you add 15 drops of urease to tube #1 and then swirl the tube until it changes to a red color. Record the amount of time that it took for the urease to change to a red color.
C5. Add 5 drops of urease to tube #2 and then swirl the tube until it changes to a red color. Record the amount of time that it took for the urease to change to a red color.
C6. Add 1 drop of urease to tube #3 and then swirl the tube until it changes to a red color. Record the amount of time that it took for the urease to change to a red color.
C7. Record your results in the answer sheet.
C8. Did using less enzyme produce a reaction?
C9. What was the effect of using less enzyme in your experiment? If your experiment did not work as expected, what should have happened?
C10. In general, what happens to the rate of reaction as the amount of enzyme is decreased?
C11. Do your results support your hypothesis? Explain.