A level Biology: Post your doubts here!

[qdkhan]

Can any1 help me with this question .... Please
http://postimg.org/image/3y9mahwpj/....

the answer is A because peptide bonds form only between COOH n NH2 grps which are attached to the central carbon atom. Grps 2 and 5 are part of the R grps of the two amino acids and hence cannot be involved in peptide bonding. these grps may be a part of the tertiary and quaternary structures of polypeptides dese amino acids may be a part of.

 

[MYLORD]

Can someone help me with these questions ASAP ?!?!?
May June 2013 question paper 11
Questions are :
4,5,11,14,15,22,25,27,28,31,32,34,37

 

[<--h-->]

Q4) first calibrate the scale :-
Stage micrometer division - 0.25
eyepiece graticule division - 100
therefore
Stage micrometer value/eye piece graticule value
0.25/100 = 0.00025mm
convert mm to micrometer =0.00025*1000 = 2.5
area of circle = πr ^2
So, π* (2.5*50) x (2.5*50)
Answer is C.

Can someone help me with these questions ASAP ?!?!?
May June 2013 question paper 11
Questions are :
4,5,11,14,15,22,25,27,28,31,32,34,37

 

[<--h-->]

Q5) Most probably because enzymes are proteins which are made in RER..this requires energy from ATP( mitochondria )..and also lysosmes are made in the golgi apparatus...i hope you get it.
Answer is C.

Can someone help me with these questions ASAP ?!?!?
May June 2013 question paper 11
Questions are :
4,5,11,14,15,22,25,27,28,31,32,34,37

 

[MYLORD]

Q5) Most probably because enzymes are proteins which are made in RER..this requires energy from ATP( mitochondria )..and also lysosmes are made in the golgi apparatus...i hope you get it.
Answer is C.

Thank u so soooo much !!

 

[lara dalal]

PPLLEAASEE ANSWER MY EXAM IS IN AN HOUR how do we do this

 

[nehaoscar]

PPLLEAASEE ANSWER MY EXAM IS IN AN HOUR how do we do this
View attachment 53287

Remember base pairing
A-T and G-C
remember that mRNA has U instead of T?
so if there are 20% C, then there must also be 20% G
that makes a total of 40% bases
100 - 40 = 60% bases are A and U
they both pair with each other so the number of A = 30% and U = 30%
so it's B - you've got it right

 

[lara dalal]

N

Remember base pairing
A-T and G-C
remember that mRNA has U instead of T?
so if there are 20% C, then there must also be 20% G
that makes a total of 40% bases
100 - 40 = 60% bases are A and U
they both pair with each other so the number of A = 30% and U = 30%
so it's B - you've got it right

THANKYOU SOOOO MUCHHH

 

[hizirofaki]

so how was the paper easy or hard and what do u expect to get

 

[Farhad221]

so how was the paper easy or hard and what do u expect to get

i think it was easy

 

[Farhad221]

Does any body have notes for Bio practical

 

[My Name]

Does any body have notes for Bio practical

Paper 3 ?

 

[Farhad221]

3

 

[My Name]

3

https://www.xtremepapers.com/commun...biology-practical-skills-dont-miss-out.14273/
It might not have everything but it has important things.

 

[Farhad221]

thank you

https://www.xtremepapers.com/commun...biology-practical-skills-dont-miss-out.14273/
It might not have everything but it has important things.

 

[My Name]

3

Check this also if you have the time
https://www.xtremepapers.com/community/threads/as-biology-33-2015-m-j.41027/#post-913998

 

[My Name]

thank you

Welcome

 

[anonymous1122]

Was it ttest or chi square?

 

[hizirofaki]

when can we discuss questions ???

 

[Heba A.Moety]

when can we discuss questions ???

after 24 hrs!