Bio ATP

[SomeStudent]

HELP!
Can anyone tell me the volume/amount of all reagents we use for food tests?
And also please guide me in how we find the magnification. How many times do we multiply/ the formula. I really need to know this.
Would mean so much. Thanks!
P.S any other tips would be very much appreciated. I stink at Bio.

 

[Khin Lamin Thaw]

Food tests for starch : use iodine solution ; if the iodine turns blue-black, it shows the presence of starch
proteins : use biuret solution; if the solution turns to a colour similar to purple , it shows the presence of proteins
fats/lipids : use ethanol; if the solution forms a white cloudy mixture on the water suface, it shows the presence of fats

I am not sure for other questions and sorry if i dun actually get the idea of ur question.. SORRY in advance..

 

[SomeStudent]

Food tests for starch : use iodine solution ; if the iodine turns blue-black, it shows the presence of starch
proteins : use biuret solution; if the solution turns to a colour similar to purple , it shows the presence of proteins
fats/lipids : use ethanol; if the solution forms a white cloudy mixture on the water suface, it shows the presence of fats

I am not sure for other questions and sorry if i dun actually get the idea of ur question.. SORRY in advance..

Gah, thank you so much!! You dont have to be sorry, you helped me all the best!

 

[coldplayer]

HELP!
Can anyone tell me the volume/amount of all reagents we use for food tests?
And also please guide me in how we find the magnification. How many times do we multiply/ the formula. I really need to know this.
Would mean so much. Thanks!
P.S any other tips would be very much appreciated. I stink at Bio.

Food tests:
Starch:
Iodine, observe a colour change from brown to blue-black.

Reducing Sugars:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Then add Benedict's solution and heat using a waterbath. Observe a colour change from blue to brick-red.

Protein:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Add potassium hydroxide and copper sulphate. Observe a colour change from blue to purple.

Fat:
Cut or grind off a small portion. Place in a test tube of ethanol and shake. Add the liquid part of this mixture to a test tube containing water. Observe a cloudy emulsifying change.

 

[SomeStudent]

Food tests:
Starch:
Iodine, observe a colour change from brown to blue-black.

Reducing Sugars:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Then add Benedict's solution and heat using a waterbath. Observe a colour change from blue to brick-red.

Protein:
Cut or grind off a small sample and add it to water to attempt to dissolve it. Add potassium hydroxide and copper sulphate. Observe a colour change from blue to purple.

Fat:
Cut or grind off a small portion. Place in a test tube of ethanol and shake. Add the liquid part of this mixture to a test tube containing water. Observe a cloudy emulsifying change.

THANK YOUUUUUUU!! That is great.

 

[asad hashmani]

N Also For Magnification.

Length of Drawing x Magnification Given (Right side of the Diagram)
Length of Original Picture

 

[SomeStudent]

Hey, so this is kinda late but please can anyone tell me me how to write data in the table? Esp if we have more than 2 things to write about. Time always comes at the x-axis?

 

[Haseefa]

Hey, so this is kinda late but please can anyone tell me me how to write data in the table? Esp if we have more than 2 things to write about. Time always comes at the x-axis?

Whatever you are controlling comes in the x-axis

 

[SomeStudent]

Whatever you are controlling comes in the x-axis

Thanks. Can you please give me an example? plz plz

 

[Z.A.M]

Thanks. Can you please give me an example? plz plz

Like temperature

 

[SomeStudent]

Like temperature

Like I m varying temperature, so it will be written on the x-axis? ok great, thank yo both of you

 

[Haseefa]

Yes, if YOU are varying the temperature and recording the time taken, then the temperature comes in the x-axis, while the time in the y-axis

 

[SomeStudent]

Yes, if YOU are varying the temperature and recording the time taken, then the temperature comes in the x-axis, while the time in the y-axis

Got it! Thanks!

 

[SomeStudent]

Oh yup, one more thing. When drawing a graph, we can draw a curve right? What if one of our points don't lie in the curve? Is it ok to leave that out?

 

[Haseefa]

Got it! Thanks!

your welcome

 

[Haseefa]

Oh yup, one more thing. When drawing a graph, we can draw a curve right? What if one of our points don't lie in the curve? Is it ok to leave that out?

it depends on the question, mostly it is a curve, and sometimes one point is doesn't lie on the curve, and they ask you to circle it or may be the reason as to why it was so

 

[whitetiger64]

HELP!
Can anyone tell me the volume/amount of all reagents we use for food tests?
And also please guide me in how we find the magnification. How many times do we multiply/ the formula. I really need to know this.
Would mean so much. Thanks!
P.S any other tips would be very much appreciated. I stink at Bio.

Thought this might help for magnification:
MAgnification = Measured/Actual

 

[SomeStudent]

it depends on the question, mostly it is a curve, and sometimes one point is doesn't lie on the curve, and they ask you to circle it or may be the reason as to why it was so

Righty, are best fit lines preferred more than curves? Because I am doing some papers in which they have drawn straight lines b/w points. Rephrased: Will I be penalised if I draw straight lines?

 

[SomeStudent]

Thought this might help for magnification:
MAgnification = Measured/Actual

That is a cool mnemonic! Thanks!

 

[Z.A.M]

Righty, are best fit lines preferred more than curves? Because I am doing some papers in which they have drawn straight lines b/w points. Rephrased: Will I be penalised if I draw straight lines?

In sum mark schemes they have rejected best fits