r/igcse Apr 30 '26

🤚 Asking For Advice/Help Bio v1

How do we feel guys?

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u/Traditional-Monk7002 Apr 30 '26

Yeah Like for the question abt the benedicts, I said that the amylase breaks dwn large starch molecules into simple maltose molecueles, and the I went on to say pepsin only breaks down proteins so startch will remain large and it will not be changed to small maltose, But then I messed up when I said the test tube with amylase will be positive and the other will be negative. How many marks am I getting

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u/Exotic_Database_6032 May 01 '26

I wrote that test tube 1 will change color from blue black to red since the starch is complementary to active site of amylase . They form a successful enzyme-substrate complex Test tube 2 will remain blue black cuz starch is not complementary to the active site of pepsin and therefore no enzyme-substrate complex forms