Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Help in bio plz on liver tissue and benedicts test

Why is the anser the opposite round i thought the liver would turn the benedicts orange ?

OP

Original post by Stormragexox

Why is the anser the opposite round i thought the liver would turn the benedicts orange ?

OP

Original post by Stormragexox

anyone

Hi, the benedict's solution starts off blue and then turns red.

OP

Original post by Jasmine528

Hi, the benedict's solution starts off blue and then turns red.

Hello XD does it gradually turn red because the glycogen is being hydrolysed by enzymes already present in the tissue

Original post by Stormragexox

Hello XD does it gradually turn red because the glycogen is being hydrolysed by enzymes already present in the tissue

Reducing sugars (like glucose) react with copper ions (Cu2+) ions in the Benedict solution which causes them to gain electrons reducing them to brick red Cu+ ions.

abbiedaniella67

Do you have the mark scheme?

Original post by Stormragexox

Yes. For liver being A it states that it gave a negative test for iodine as it doesn't contain starch and phloem being B it contains sucrose/a non-reducing sugar which was hydrolysed to a reducing sugar/monosacharride.

OP

Original post by Jasmine528

Yes. For liver being A it states that it gave a negative test for iodine as it doesn't contain starch and phloem being B it contains sucrose/a non-reducing sugar which was hydrolysed to a reducing sugar/monosacharride.

Thx for replying why is the test for starch +ve for B does the phloem also contain starch

Original post by Stormragexox

Thx for replying why is the test for starch +ve for B does the phloem also contain starch

Yes as plants store carbohydrates as starch.

Original post by Jasmine528

Yes as plants store carbohydrates as starch.

Hello, could you please help me in this question : https://www.thestudentroom.co.uk/showthread.php?p=82918592&highlight=

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