Help in bio plz on liver tissue and benedicts test

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Stormragexox
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#1
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Why is the anser the opposite round i thought the liver would turn the benedicts orange ?
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Stormragexox
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(Original post by Stormragexox)
Why is the anser the opposite round i thought the liver would turn the benedicts orange ?
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Stormragexox
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(Original post by Stormragexox)
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anyone
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Jasmine528
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Hi, the benedict's solution starts off blue and then turns red.
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Stormragexox
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(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
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Jasmine528
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(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.
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abbiedaniella67
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Do you have the mark scheme?
(Original post by Stormragexox)
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Jasmine528
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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.
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Stormragexox
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(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
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Jasmine528
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(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.
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Leah.J
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(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/sho...592&highlight=
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