Biology/Physics ATP Preparation Thread

[intelnehalem]

Hello,
Let's discuss some of the possible questions that we are likely to get for our ATP papers If you have any questions to ask regarding anything related to practicals, please feel free to do so here and not make countless amounts of threads which can be quite untidy
Let me start by asking you a question (Biology) Let's discuss this !

Describe how you could carry out an experiment to show that reducing sugar content increases during ripening of a fruit. Include any safety precautions in your answer.

 

[intelnehalem]

My answer:
Obtain ripe, partially ripe and unripe fruits of the same species.
Take equal amounts of sample from each of the fruits (ripe/partially ripe and unripe)
Crush and grind each sample.
Place these samples in 3 test tubes and add equal amounts of water ex: 2 cm3 into each test tube
Add equal amounts of benedicts solution to each test tube.
Place all 3 test tubes in the same water bath (precaution) to make sure that the temperature is same for each test tube.
Heat the above
Observe and compare colour changes.
repeat the experiment .
As a fruit ripens, reducing sugar content increases so the final result is a brick red ppt (ripe) , orange/yellow for partially ripe and blue/green for unripe from the original colour of benedict's : Blue.

 

[Silent Hunter]

i think ur answers correct intel

 

[intelnehalem]

i think ur answers correct intel

Thanks mate ! You are taking Bio ATP too right?
All the best !

 

[KarachiRocker]

Nice one Intel. Share some more questions

 

[intelnehalem]

Nice one Intel. Share some more questions

Sure !
Here is another one:

You are given 3 samples of antibiotics : A,B,C and 3 bacterial agar cultures. Describe an experiment to show which of the antibiotics is most efficient at destroying the bacteria

 

[Silent Hunter]

i think ur answers correct intel

Thanks mate ! You are taking Bio ATP too right?
All the best !

yep i am.........lets have some more of these type of questions expected this session :wink:

 

[Silent Hunter]

-make holes in each of the three cultures
-add the A B C in them respectively.....like one A in one culture and B in the second one etc
-observe the cleared area around each bactera in the culture
-the antibiotic surrounded by most cleared area is the best for that specific agar culture

 

[intelnehalem]

-make holes in each of the three cultures
-add the A B C in them respectively.....like one A in one culture and B in the second one etc
-observe the cleared area around each bactera in the culture
-the antibiotic surrounded by most cleared area is the best for that specific agar culture

Correct ! You can also dip filter paper in the antibiotics and place them in the middle of the agar culture This is also acceptable

 

[intelnehalem]

Let's do a physics question now!

Describe how you could prove that the resistance of a thermistor decreases with temperature. Include any safety precautions in your answer.

 

[abcde]

Nice work, intelnehalem! I'll see if I can help too for further queries. And I'm gonna put my doubts here as well.

 

[intelnehalem]

Nice work, intelnehalem! I'll see if I can help too for further queries. And I'm gonna put my doubts here as well.

Thanks mate! call me Intel I don't mind that hahaha
Yup, be sure to ask all your doubts here ! I will try to post my Bio ATP notes here by today as promised

 

[abcde]

Yes, please! For the first experiment, safety precautions could include: wear a apron or lab coat, perform the experiment on a protective mat etc.

 

[intelnehalem]

Yes, please! For the first experiment, safety precautions could include: wear a apron or lab coat, perform the experiment on a protective mat etc.

yes! The water bath is also a safety precaution btw

 

[KarachiRocker]

^^, tough one

 

[KarachiRocker]

Hey intel, are those Biology ATP notes useful ? I mean what are they all about ?

 

[intelnehalem]

^^, tough one

the thermistor question?

 

[intelnehalem]

Hey intel, are those Biology ATP notes useful ? I mean what are they all about ?

Well, they are mostly about experiments ! ex: microscope,transpiration experiments, photosynthesis experiments

 

[KarachiRocker]

Yeah. Tell me the answer right now !

 

[KarachiRocker]

Oh Great ! So when will you be posting them ? Are they available on internet ??