AS biology paper 21 discussion!

[angelaxx]

Okay guys so since 24 hours have passed let's start discussing the paper hope you all did well!!

 

[Alex10]

Cytokinesis and DNA replication respectively.

 

[angelaxx]

Wat did u write for tht mass of DNA question...... Wat were W and C

I can't remember what letters they were but firat one was cytokenesis and the second one was interphase

 

[Alex10]

I can't remember what letters they were but firat one was cytokenesis and the second one was interphase

Good job

 

[Alex10]

Nd wat abt da last question,the last part abt systematic nd pulmonary circulation

I think you had to write about the SAN and AVN and the wave of excitation and all..

 

[angelaxx]

Nd wat abt da last question,the last part abt systematic nd pulmonary circulation

You had to write about the SAN and where the impulse is transmitted and you had to talk about how it doesnt reach ventricles so it sends impulse down to AVN where it sends impulse through purkyne fibres and bundle of his to ventricles, also talk about how AVN delays inpulse to allow ventricular systole to occur after atrial systole

 

[Natashakhan]

i wrote telophase and interphase..

 

[ashry twins]

For the DNA can we write anaphase for the W part on the graph

 

[angelaxx]

i wrote telophase and interphase..

It wasn't telophase it was interphase! :/ it's a repeated question from a paper but I can't remember which paper it was I hipe you got the rest of the paper right!!

 

[angelaxx]

For the DNA can we write anaphase for the W part on the graph

I don't know but I know it's cytokinesis for sure !!!

 

[Natashakhan]

yh instead of cytokinesis i wrote telophase :/
and fr the other one i write interphase

 

[Alex10]

Explain the role of memory cells?

 

[angelaxx]

yh instead of cytokinesis i wrote telophase :/
and fr the other one i write interphase

Interphase is correct! And for the telophase part don't worry because you never know the examiner might mark it correct as telophase is close to cytokinesis!

 

[angelaxx]

I wrote abt immunological memory secondary immune respone nd all

Yup that's correct

 

[angelaxx]

I think according to me bio paper was easy except tht immunity question

Immunity question was the most interesting!! It was easy too

 

[Gummy Beat]

For the ALL cancer question in children. I wrote about second hand smoke, inflammtion of lungs (by bacteria growing in excess mucus etc), causes b cellls to leave blood to enter lungs, then i talked about how tar causes cancer with the whole protooncogenes to oncogenes and switching off tumor supressor genes and metastasis. Is any of that correct : /