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Edexcel IAL Biology Unit 4 June 2016

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Guys, I can't get at ALL the entomology stuff and like how to know the time of death and life cycle of this insect, if someone could explain it or send me some notes about it, I'd be more than grateful!!!

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Hey guys which parts of AS are you revising?
Original post by TheMadHatteress
Hey guys which parts of AS are you revising?


Definitely all the Biodiversity stuff, coz its related to the Ecology chapter in Unit 4. :smile:
Original post by PlayerBB
Guys, I can't get at ALL the entomology stuff and like how to know the time of death and life cycle of this insect, if someone could explain it or send me some notes about it, I'd be more than grateful!!!

Posted from TSR Mobile


Hey! Entomology is not very complicated but there is a lot to know. I hope you get the basic idea from these videos. If you need more help in specific area like Rigor Mortis and the factors that affect it, just ask. :smile:

https://www.youtube.com/watch?v=HIVKISCmjTQ


https://www.youtube.com/watch?v=Ie-_bTsxGJU
Original post by Sandy_Vega30
This has all the mind maps required for Unit 4. Its well broken down and simple. Hope this helps! :smile:

https://drive.google.com/folderview?id=0BymD5DhLTD45UU15bXRDOUdXRWs&usp=drive_web&tid=0BymD5DhLTD45MjF1SHJVb3J4S28#grid


Ah you're a babe!x
Original post by Annaaix_
Ah you're a babe!x


Your Welcome! :h:
Original post by Sandy_Vega30
Hey! Entomology is not very complicated but there is a lot to know. I hope you get the basic idea from these videos. If you need more help in specific area like Rigor Mortis and the factors that affect it, just ask. :smile:

https://www.youtube.com/watch?v=HIVKISCmjTQ


https://www.youtube.com/watch?v=Ie-_bTsxGJU


Ahh, thank you so much, I will surely have a look at them!!

Just to confirm, Rigor Mortis occurs when there is no aerobic respiration going on, and then after time, anaerobic respiration stop occurring leading to stiffness and rigidity of muscles ?
(edited 7 years ago)
Original post by PlayerBB
Ahh, thank you so much, I will surely have a look at them!!

Just to confirm, is Rigor Mortis occur when there is no aerobic respiration going on, and then after time, anaerobic respiration stop occurring leading to stiffness and rigidity of muscles ?


Rigor Mortis is basically affected by the amount of ATP in a body. After a person is dead, the amount of ATP synthesized decreases even though the muscle cells respire anaerobically for sometime. ATP is need to relax the muscles in a relaxed state (refer to actin and myosin movement), hence as ATP supply decreases, the muscles begin to stiffen more. Hope that helps. :smile:
Original post by Sandy_Vega30
Rigor Mortis is basically affected by the amount of ATP in a body. After a person is dead, the amount of ATP synthesized decreases even though the muscle cells respire anaerobically for sometime. ATP is need to relax the muscles in a relaxed state (refer to actin and myosin movement), hence as ATP supply decreases, the muscles begin to stiffen more. Hope that helps. :smile:


Yeah, that definitely helps!! Thanks Sandy!! :h:
Original post by PlayerBB
Yeah, that definitely helps!! Thanks Sandy!! :h:


Your Welcome!! :colondollar:
Reply 30
Avatar for Aimen.
Aimen.
7
How and when does 'peptidyl transferase' helps in translation? :s-smilie:
Isn't in the book really but comes up in mark scheme so often!
Original post by Aimen.
How and when does 'peptidyl transferase' helps in translation? :s-smilie:
Isn't in the book really but comes up in mark scheme so often!


I looked it up on wiki : https://en.wikipedia.org/wiki/Peptidyl_transferase

Could you please refer me to the specific papers that this comes across? I haven't really heard of this. :redface:
Reply 32
Avatar for Aimen.
Aimen.
7
Original post by Sandy_Vega30
I looked it up on wiki : https://en.wikipedia.org/wiki/Peptidyl_transferase

Could you please refer me to the specific papers that this comes across? I haven't really heard of this. :redface:


It was gce specimen paper (I don't remember what question exactly)
and june 2010 Q#5 (b)(ii)
and might be in others but I haven't solved more yet!
Original post by Aimen.
It was gce specimen paper (I don't remember what question exactly)
and june 2010 Q#5 (b)(ii)
and might be in others but I haven't solved more yet!


I'm afraid I don't have those papers. Could you please send me a link? :colondollar:
(edited 7 years ago)
Reply 34
Avatar for Aimen.
Aimen.
7
Original post by Sandy_Vega30
I looked it up on wiki : https://en.wikipedia.org/wiki/Peptidyl_transferase

Could you please refer me to the specific papers that this comes across? I haven't really heard of this. :redface:


I never actually got anything from wiki!
Do you think it helps in formation of peptide bonds b/w adjacent amino acids? :3
Reply 35
Avatar for Aimen.
Aimen.
7
here you are:
June 2010 is attatched and specimen is at https://qualifications.pearson.com/content/dam/pdf/A%20Level/Biology/2013/Specification%20and%20sample%20assessments/sam-gce-biology.pdf
Questionpaper-Unit4(6BI04)-June2010.pdf551.3KB
Markscheme-Unit4(6BI04)-June2010.pdf142.4KB
Original post by Aimen.
I never actually got anything from wiki!
Do you think it helps in formation of peptide bonds b/w adjacent amino acids? :3


Yeah I think that's exactly what it does. :smile:

Here's another one: http://www.merriam-webster.com/medical/peptidyl%20transferase
Reply 37
Avatar for Aimen.
Aimen.
7
Original post by Sandy_Vega30
Yeah I think that's exactly what it does. :smile:

Here's another one: http://www.merriam-webster.com/medical/peptidyl%20transferase


That really helped x :heart::hugs:
And if you don't mind could you please explain me the process of phagocytosis ('cuz I just discovered that it involves b-cells and antibodies and now I'm dead!)
Original post by Aimen.
That really helped x :heart::hugs:
And if you don't mind could you please explain me the process of phagocytosis ('cuz I just discovered that it involves b-cells and antibodies and now I'm dead!)


Sure! Do you know how the humoral response works?
Reply 39
Avatar for Aimen.
Aimen.
7
Original post by Sandy_Vega30
Sure! Do you know how the humoral response works?


Yea it's the only thing I know in immunity xD

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