AS BIOLOGY P-33

[Toomuch1995]

Okay what are S1 , S2 and S3?
What we will do with them? :O

 

[beeloooo]

what is weighing bottle sodium hydrogen carbonate is for? nd were nt given NaOH ? to test for non-reducing sugars

well see this what ill post for non reducing AGAIN!

 

[comrade]

disaccharides are NOT non-reducing. Except for sucrose.

Disaccharides are reducing sugars then?

 

[Bluejeans#]

well see this what ill post for non reducing AGAIN!

oh thanks ...sorry i was confuse so we'll use sodium hydrogen carbonate instead of NaOH simple

 

[MaxStudentALevel]

uumm surf the prev pages... u will find the questions...

How do you know this is true?? Although our bio teacher also had us practice food tests!

 

[aleezay]

Disaccharides are reducing sugars then?

Yep. Sucrose, however, is non reducing.

 

[comrade]

Boy all dissacharides are reducing sugers except Sucrose .........!!!!this is what i read in the O level book

Yep. Sucrose, however, is non reducing.

Thanks you. I'll note that down. Silly of me though. I forgot.

 

[aleezay]

Thanks you. I'll note that down. Silly of me though. I forgot.

Np

 

[Ahmad Zaeem]

Disaccharides are reducing sugars then?

Yess disaccharides are reducing sugers except Sucrose ....

 

[NidaChaudhary]

does any 1 know anything about the microscope specimen?? :/

 

[ICTloverz]

Guys the test for non- reducing sugar is, first taking the non-red sugar with benedicts and heating it in water bath for a specified time and then adding HCL and then neautralising it with sodium bicarbonate.. ? am I right

 

[DumbIdiot]

Can some one please share the food test procedures and will we have a graticule scale and all that?

 

[kelly sheers]

diagram for monocot stem

 

[kelly sheers]

diagram for monocot stem

another version

 

[Taha.Sajid]

what is weighing bottle sodium hydrogen carbonate is for? nd were nt given NaOH ? to test for non-reducing sugars

Actually we have to hydrolise sucrose to reducing sugar using HCL and heating it to over 80 degrees.
And then we have to perform benedicts test.But before that we need to neutralise the excess acid we used earlier by using NaHco3 which is an alkali.We'd be given a ph indicator or something(ph paper) to check for the neutral ph.

 

[Bluejeans#]

Actually we have to hydrolise sucrose to reducing sugar using HCL and heating it to over 80 degrees.
And then we have to perform benedicts test.But before that we need to neutralise the excess acid we used earlier by using NaHco3 which is an alkali.We'd be given a ph indicator or something(ph paper) to check for the neutral ph.

yea i got it thanks

 

[a level freak]

Hello. Can you guys help me distinguish between LPP and HPP diagram? I couldnt get the part where they say do not draw individual cell in LPP.

but what is lpp and hpp (full form)

 

[Alool]

guys, what do they mean by first sign of colour change.. for example in reducing sugar test, the first sign is green??

 

[beeloooo]

guys, what do they mean by first sign of colour change.. for example in reducing sugar test, the first sign is green??

green -- means traces present . yellow --- low amounts ... orange --- moderate amounts ....brick red --- high amounts

 

[beeloooo]

Actually we have to hydrolise sucrose to reducing sugar using HCL and heating it to over 80 degrees.
And then we have to perform benedicts test.But before that we need to neutralise the excess acid we used earlier by using NaHco3 which is an alkali.We'd be given a ph indicator or something(ph paper) to check for the neutral ph.

even if its slightly alkaline that'll do ...