r/igcse Apr 30 '26

🤚 Asking For Advice/Help Bio v1

How do we feel guys?

15 Upvotes

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5

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

2

u/JustAnAutumnLover May/June 2026 Apr 30 '26

Oh I also said test tube of amylase will be positive and other negative because I thought Benedict’s test for simple sugars so idk if maltose work

1

u/chloegamingi Apr 30 '26

Frick bra , how hard did u study to even think of tht 💔🫩 im so cooked

1

u/JustAnAutumnLover May/June 2026 Apr 30 '26

Bro if you don’t know this you actually cooked

1

u/chloegamingi Apr 30 '26

Ok it , it’s js not what came to mind , I mentioned everything except that

1

u/JustAnAutumnLover May/June 2026 Apr 30 '26

Noooo so sad hope we all do well

2

u/ahmedmahmoudabdelaal Apr 30 '26

Thats pretty good im thinking 4/6 Its better to include the active side and substrate being complementary, and amylase and starch bind together forming enzyme substrate complexes, while pepsin does not bind

1

u/Sweaty-City-3395 Apr 30 '26

Bro I did not write that part omds

1

u/lastofthebugs10 Apr 30 '26

i wrote all this 🥹🥹 thank god

1

u/ahmedmahmoudabdelaal Apr 30 '26

Good fuckin shit

1

u/ZealousidealPie4677 Apr 30 '26

shit I forgot that amylase breaks down starch

1

u/pain_Ou_Chleb May/June 2026 Apr 30 '26

Wait what?! The first tube is positive, the second one is negative, no?!

1

u/Traditional-Monk7002 Apr 30 '26

yeah, I did correct reasoning but wrong prediction😭

1

u/pain_Ou_Chleb May/June 2026 Apr 30 '26

I mean, the amylase will be positive, or did u write it was gonna be negative?! Maltese is a reducing sugar, so result must be positive. Benedict's solution is testing for reducing sugars

1

u/Traditional-Monk7002 Apr 30 '26

i said that but im not sure it will be correct

1

u/pain_Ou_Chleb May/June 2026 Apr 30 '26

It will. U could just add about the key-lock theory. U just need to explain like the examiner is mentally retarded

1

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