A level Biology: Post your doubts here!

[♣♠ Magnanimous ♣♠]

God Will Help InshAllah !
Dnt Worry dude! Give your best and U may end up with an A!

yeah.. now it's up to GOD. please pray for me because a student can only do 80% but 20% are of teachers which is lacking in me and from 80% i am capable of only 69%.

 

[princeali97]

Well i rely 1000000% on ALLAH rite now !

 

[Mohammed salik]

Well i rely 1000000% on ALLAH rite now !

Hahah Especially after S13 _qp23 Right??

 

[sumeru]

AS known that HB is formed of 4 polypeptides ?
How are these joined together? IS IT BY HYDROGEN BONDS ?

It is a quarternary structure....so contains all the 4 bonds as in tertiary structure......

 

[sumeru]

I have biology paper 22 exam tomorrow....

 

[bubbles1997]

Any guess for tomorrow's paper?

 

[kitkat <3 :P]

here is a file in which it contains questions which are repeatedly asked every year... This is not my file though i wanna share it kitkat <3 :P

leeminho

 

[VelaneDeBeaute]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_w11_qp_21.pdf

Q2 B) AND C)

I need help in this question plz

In B, there is irreversible non-competitive inhibition. You have to explain that and quote data from graphs to support your explanation.
In C, you have to outline how RER makes proteins and Golgi modifies the polypeptides to form their tertiary and Quaternary structures and all the bonds, and finally packages and releases them as enzymes.

 

[GCE As and a level]

In B, there is irreversible non-competitive inhibition. You have to explain that and quote data from graphs to support your explanation.
In C, you have to outline how RER makes proteins and Golgi modifies the polypeptides to form their tertiary and Quaternary structures and all the bonds, and finally packages and releases them as enzymes.

thank you,
but in B) why it is non competitive inhibitor
when the concentration of the substrate increase the initial rate of reaction will also increase , if i am not wrong

 

[VelaneDeBeaute]

thank you,
but in B) why it is non competitive inhibitor
when the concentration of the substrate increase the initial rate of reaction will also increase , if i am not wrong

Because an inorganic ion is involved. When you think of it, anything that fits into the active site has to form Hydrogen bonds with the aminoacids on the active site. Cobalt being an inorganic ion can't do so. So it would attach to the enzyme elsewhere.

I didn't get the second line of your question though.

 

[kitkat <3 :P]

Non competitive inhibitors are not effected by substrate concentration they donot attach to the active site but affects it which prevent formation of enzyme substrate complex

 

[♣♠ Magnanimous ♣♠]

Non competitive inhibitors are not effected by substrate concentration they donot attach to the active site but affects it which prevent formation of enzyme substrate complex

absolutely correct

 

[kitkat <3 :P]

absolutely correct

 

[Alool]

i have a problem in describing graphs.. can someone help me with it? what exactly should i write about?

 

[bubbles1997]

Please help.
q1. Describe how cells develope into tumor
q2. Decribee how cell develope cancer

 

[Busy Buddy]

can anyone please tell me what is tidal volume, vital capacity & their formula? I forgot them.

 

[hellangel1]

I heard somewhere that we have to take our venue letters to the exam centre, is it true?

 

[sumeru]

Any guess for tomorrow's paper?

I guess, they will ask more questions related to mammalian transport system....

 

[MÁťT PŭמҚ]

does anyone knw how to calculate standard deviation in paper 5? :/

 

[bubbles1997]

I guess, they will ask more questions related to mammalian transport system....

I believe they will ask more about malaria