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Biology; Chemistry; Physics: Post your doubts here!

Talhakhan

Talhakhan

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Guys need help.... In LOCK and KEY hypothesis which is lock and which is key...... Give reference with the enzyme and substarte.....
 
robinhoodmustafa

robinhoodmustafa

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Talhakhan said:
Guys need help.... In LOCK and KEY hypothesis which is lock and which is key...... Give reference with the enzyme and substarte.....
Click to expand...
The Lock is the Enzyme and the key is the Substrate ..
E.g: Protease "Enzyme and lock": act's on the Protein(substrate ) and Form's a Lock and Key Hypothesis and Convert it into Amino acid :)
 
étudiante

étudiante

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Talhakhan said:
Guys need help.... In LOCK and KEY hypothesis which is lock and which is key...... Give reference with the enzyme and substarte.....
Click to expand...
The lock and key model simply explains the specifity of enzymes for the substrate.
The enzyme is the "lock". It has a particular shape (the active site) and only one particular molecule will be able to fit the shape (i.e. will be complementary to it).
Thus the substrate is the "key" which can unlock/fit the enzyme.
Since the substrate has to "fit" in order for the enzyme to work on it, it can only catalyse specific reactions. This gives specifity to the enzyme action.
Hope that explains it. :)
 
asd

asd

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snowbrood said:
why do they balance by 4 (both iron ions)
Click to expand...
Complete equation is : 4Fe+2 + 4H+ + O2 ---> 4Fe+3 + 2H2O
And why did they balance both iron with 4? That's because in ionic equation you see the overall charge on both sides. The total +ve charge must be equal to total -ve charge.
 
Oishee Asif

Oishee Asif

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Aaaaah, damn. Would I get a mark if I wrote 'reducing sugar present—maybe in small amount'

;_; why did I write 'maybe'!?!?

& for the nervous response question, did the mean numbers have to be rounded up to the nearest whole number?
 
ashiqbal

ashiqbal

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Oishee Asif said:
Aaaaah, damn. Would I get a mark if I wrote 'reducing sugar present—maybe in small amount'

;_; why did I write 'maybe'!?!?

& for the nervous response question, did the mean numbers have to be rounded up to the nearest whole number?
Click to expand...
for maybe, "maybe" u will get the mark :p!! just kidding, i am sure that the examiner will reward u a mark for recognizing the factor of small amount.

i rounded them up, but wrote both of them, the non-rounded and the rounded figures, though the marking schemes have not been released so anyone could be right.
 
falcon678

falcon678

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SilverCrest said:
in AC generator and DC motor..:)
Click to expand...
in a.c motor carbon brushs r not used...split ring commutator is used....in DC motor carbon brush is used to chnge diretion of current every half turn so tht coil rotates is same direction..!!!
 
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