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AS Level Biology: Topical Questions

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hello do we have to study about transmission and scanning electron microscopes for bio A levels ??or just we have to know that they are the 2 types of e- microscope?
 
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hello .. plz i need some help here !!
i read that the same enzyme can catalyse both the forward and the bacward reactions ...but how is that isnt it like sub+enz=prod so if we take it backwards it will be like product+enz=sub but the product has different shape to the sub and the active site so how it is catalysed by same enz. ??
 
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As I promised, I am uploading the rest of AS Level Biology Topical Question Bank.
Now all the topics from A to K are uploaded.
Hope you will find them useful.
Keep on the hard work.

I have selected those questions which will make your concept clear and will form a clear image in your mind about how the examiner asks questions.
I will also be uploading Revision Question Bank shorty. Till then stay tuned.



Warm Regards,
Waleed Ahmad Khan
Edwardes College Peshawar
please Upload answers as well. Thanks!
 
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can sumbody check my answers..(the mcq's only)
 

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can anyone please post the mark schemes to the topicals... please.. it will be really helpful. And how are you guys checking your solved topicals ?
 
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In a certain organism, two traits are determined by two pairs of alleles, each of which shows dominance. One trait is determined by some combination of the alleles A and a. The other trait is determined by some combination of the alleles B and b, which are located on a different chromosome from A and a. Construct a complete Punnett square to show the results of a cross between two parents with genotypes Aabb (parent #1) and AaBb (parent #2). Then determine each of the following:

a) What fraction of the offspring is expected to have the same genotype as parent #1?
b) What fraction of the offspring is expected to have the same phenotype as parent #2?
c) What fraction of the offspring is expected to be dihybrid?

Please help me, i have a test tmmw!!! if possible please mail me the answer at [email protected]
 
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