Edexcel GCE Biology Unit 5 6BI05 June 2013

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Reply 1060

ViolentMind

Original post by super121

Anything that appears in the pre-release as that's the bit that's highly synoptic

Sorry i have to ask but is that on the edexcell site?

Reply 1061

SKK94

Original post by tsr1

how does lactate makes NAD available? can someone explain please? thanks

During anaerobic respiration, pyruvate is reduced to lactate using hydrogen from NADH2 thus also forming NAD.

Reply 1062

Nathan@

Do you mind me asking how are you revising?

Reply 1063

Mjwilson1988

Original post by Nathan@

Is this a Pm or Am exam, i think its PM , is that right?

Yep afternoon exam.

Reply 1064

iwantopas19

Original post by I Hate Edexcel

Ahhh bricking it.

U asked a nice quesion related to the article, now i cant find it. can u please repost it? and did u get the answer?

Reply 1065

super121

Original post by ViolentMind

Sorry i have to ask but is that on the edexcell site?

The pre-release? Then yes

Reply 1066

ViolentMind

Original post by super121

The pre-release? Then yes

yeah is it the specification report?

Reply 1067

super121

Original post by ViolentMind

yeah is it the specification report?

It's under assessment materials, but it's locked for some reason. It's definitely been posted on this thread a few times so have a look back :smile:

Reply 1068

hussaincute

can somebody answer these questions plz:

1)Explain why large bodied animals need a well developed circulatory system?

2)Describe the events in the eukaryotic mitotic cell cycle?

Reply 1069

Nathan@

I'm using the cgp revision guide but i usually find that the questions are slightly weird and different to the spec. Perhaps a more twisted view of the spec if you know what i mean

Reply 1070

ViolentMind

Original post by super121

It's under assessment materials, but it's locked for some reason. It's definitely been posted on this thread a few times so have a look back :smile:

Ohh yeah my mind wandered there, i have it thanks.

Reply 1071

Nathan@

We do the normal biology but i do find that the book does waffle a bit

Reply 1072

iwantopas19

im aiming 30/90 -_-
good luck ppl

Reply 1073

Mjwilson1988

Original post by hussaincute

can somebody answer these questions plz:

1)Explain why large bodied animals need a well developed circulatory system?

2)Describe the events in the eukaryotic mitotic cell cycle?

1) Large bodied organisms have a low surface area : Volume ration (we've got a lot of volume and not a lot of surface area), so trying to diffuse or absorb all the air and nutrients through our skin just wouldn't work because the diffusion pathway is far too long and the cells on the deep inside of our bodies would never get the stuff they need, and if they did, it'd only arrive there three hours later! So we need a well developed circulatory system, which branches out to all the tissues and cells of the body so nutrients and Oxygen etc etc can be transported there quickly.

2) How much detail do you want? You've got Interphase which is split up into G1 (Gap 1: growing and doing its normal stuff), then S (synthesis) in which DNA replication occurs, then G2 (gap 2, more growth and just doing its normal Cell-y functions, also organelles duplicate in prep for cell division). Then it is Mitosis and we all know what happens there (Prophase, Metaphase, Anaphase and Telophase). Finally it is Cytokineses, which is when the cell actually splits into two.

Reply 1074

Nathan@

Yeah, that's true the diagrams are good in the green book btw what are your predictions for tomorrow

Reply 1075

zippy100012

Original post by iwantopas19

im aiming 30/90 -_-
good luck ppl

LOL me too, I literally need anything around there to get into uni. Still kinda worried as lately I've somehow forgotten everything I've learned.

Reply 1076

hussaincute

can sombody plz answer that in simple words:

explain why ATP production decreases when oxygen is low in the tissues?

Reply 1077

Brad0440

More unit 5 questions:

Describe the structure of a muscle fibre. (4)

Spoiler

Explain how plants grow towards light. (6)

Spoiler

State two consequences of exercising too little and two consequences of exercising too little. (4)

Spoiler

(edited 10 years ago)

Reply 1078

nebbydog

hi does anyone have skype and want to do a chat about the exam i did it for english and it was really helpful

Reply 1079

Ziggy_72

Original post by Volltorb

so i did and the mark scheme had "3.5 x 10-3 ÷ 1.7 x 10-6" but the answer was "2059 {million / x 10 6 }/ 2058.8 {million / x 10 6 } / 2 058 823 530 ;" ???

Read the question again - it say that there is x force in a million fibres or something like that. I got stuck there too then realised I had missed out a bit of the question. It is mysoin filaments to fibres to muscule - not just filaments to muscle. This will make sense if you look at the question again.