Edexcel GCE Biology Unit 4 6BI04 June 2013

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Reply 360

swahmad

Does anyone have any advice on time keeping?

Reply 361

iwantopas19

Original post by Brad0440

The crosses means that the specification point IS in the past paper.

As the headings aren't very clear, I'll put a list of them here in the same order as they are on the image:

Chloroplasts in photosynthesis
Photosynthesis
-Energy from light to break up water
-Hydrogen stored as a fuel in glucose by combination with CO2 and releasing O2
Light dependent reactions
ATP as energy
Light independent reactions
Use of light independent reaction products
NPP + GPP
Trophic levels
Carbon cycle
Biotic and abiotic factors
Ecology study
Niche
Succession
Global warming cause and effect
Temperature and enzyme activity
Temperature and development
Evidence for global warming
Global warming controversial evidence
Change in allele frequency due to mutation/natural selection
Speciation
Antibitoic resistance
Accepting evidence due to peer review etc.
Nature of the genetic code
Protein synthesis
Exons
DNA profile
PCR
Gel electrophoresis
Bacteria Vs. viruses
Decomposition by micro-organisms
Barriers to infection
Specific bacterial and viral diseases (i.e. TB and HIV)
Non-specific immune system
Cells etc. within the immune system (e.g. T-cells, antibodies, etc.)
Immunity
Antibiotic types (static/cidial)
Antibiotic effects ('Clear zone' practical)
Death-forensics

Sorry about the poor hand-writing, and I can't guarantee that I haven't missed any questions out. Also, the last column is just my predictions as to what could come up in this paper and can be ignored.

Hard work!

now im giving all my attention to ur predictions :tongue:

Reply 362

raves

Original post by swahmad

Carbon dioxide and methane are greenhouse gases (methane has a stronger greenhouse effect)Absorb ifra red radiationTraps heatWarms Earth, greenhouse effect

thank yoou

Reply 363

raves

Original post by nukethemaly

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causes

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greenhouse effect

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greenhouse gases

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effects: think about this in terms of social, economical, and evironmental (thats the most important one)

•

evidence for it

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evidence against it

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scientific community and their involvement in getting this evidence

thank yyoooou

Reply 364

amber109

what are the sequence of events that take place when someone is infected with HIV?
i.e. the non specific immune response

Reply 365

Selym95

Sorry about this, but what have people learnt for the specific immune response? I have learnt the process from the CGP revision guide, but I am worrying that it is too basic.

Thanks a lot!

Reply 366

nukethemaly

Original post by Selym95

Sorry about this, but what have people learnt for the specific immune response? I have learnt the process from the CGP revision guide, but I am worrying that it is too basic.

Thanks a lot!

the official textbook is quite good for it, so have a look through that!

Reply 367

Brad0440

Original post by amber109

what are the sequence of events that take place when someone is infected with HIV?
i.e. the non specific immune response

There are three stages that follow the initial infection:

The acute phase:
-HIV antibodies appear in the blood (after 3-12 weeks)
-The virus enters and destroys T-helper cells to replicate, causing a net loss of T-helper cells and an increase in HIV
-A few weeks after the initial infection, the T-killer cells recognise and destroy infected T-helper cells

The chronic/latent phase:
-The action of T-killer cells keeps in check the number of HIV in the body, but cannot completely eliminate them
-During this phase, opportunistic diseases (like TB) can reactivate and other illnesses like colds can take longer to get over than normally, due to a decreased immune system

The disease phase:
Eventually, the number of HIV in the body overwhelms the immune system and causes the T-helper cell count to drop dramatically, severely damaging the immune system and indicating the onset of AIDS

Original post by nukethemaly

OCR B by any chance?

No actually, I'm doing OCR chemistry A.

(edited 10 years ago)

Reply 368

tsr1

What's the difference between ATP-ase and ATP- synthase? I know they're both enzymes in the thylakoids . but is there any difference? The mark schemes sometimes say ATP-ase and other times it says ATP synthase?

(edited 10 years ago)

Reply 369

Brad0440

What is the humoral immune response? Does it also have a different name?

Reply 370

Brad0440

Original post by tsr1

I'm pretty sure they're both the same. I think I saw a mark scheme (possibly a 6BI05 one) that had "ATPase/ATP synthase" as the answer, so I'm guessing that they at least have the same function...

Reply 371

himi-patel

Original post by Brad0440

What is the humoral immune response? Does it also have a different name?

its the response of the immune system which includes the b cell being activated,,m not going to the details.....the b cell gets activated by the t helper cell with the help if cytokines ,,,,,so the activated b cell differentiates to plasma cell wich produce antibodies,,,thats humoral...i think itz also called clonal selection,,,,

Reply 372

himi-patel

Original post by Nathan@

Can anyone explain the clonal selection

itz the same as humoral immune response

Reply 373

amber109

so what are the predictions for tomorrows paper?

Reply 374

SKK94

Alright, I'm off! Good Luck everyone!
Stay sharp and give it your best! :biggrin:

Reply 375

amber109

i'll probably stay up till 12

Reply 376

PakStar28

Here are the January Papers for Unit 4 and 5

6BI05_01_que_20130121.pdf751.1KB

6BI05_01_rms_20130307.pdf143.4KB

6BI04_01_que_20130111.pdf794.3KB

6BI04 2013 Mark Scheme.pdf160.6KB

Reply 377

Sravya

Can someone name all the key core pracs?

Reply 378

Taylor Swift

Original post by Brad0440

I'm pretty sure they're both the same. I think I saw a mark scheme (possibly a 6BI05 one) that had "ATPase/ATP synthase" as the answer, so I'm guessing that they at least have the same function...