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AQA - BIOL4 - 13th JUNE 2014

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JAN 2010 calculation question 2b help please !
http://filestore.aqa.org.uk/subjects/AQA-BIOL4-W-QP-JAN10.PDF

100/2.5=40 because this is the point where the curve is steepest (max rate) gradient =2squares on y-axis (100) and 1 square on x axis(2.5) :smile:

sorry if this isn't clear

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Reply 1581

09crane

are NAD and NADP the same thing...i get so confused?!

Reply 1582

MJ-17

Original post by A sheesh

Doesnt nadp gain protons from the photolysis of wter and the electrons are used to replace the ones lost from the chlorophyll

Yeah 2H2O -- 4H+ + 4e- + O2

Protons to NADP, electrons to chlorophyll, O2 waste

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Reply 1583

MJ-17

Original post by ΘTheta

What do you mean? How will the saprotroph take in nutrients from the matter its decayed? :confused:

Just know saprobiotic micoorganisms secrete enzymes which break down the larger organic molecules into smaller molecules the organism can consume. Co2 is released as it respites - carbon cycle decay

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Reply 1584

MJ-17

Original post by 09crane

are NAD and NADP the same thing...i get so confused?!

NAD is involved in respiration
NADP is involved in photosynthesis

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Reply 1585

Ameera226

Original post by MJ-17

Not pest control, that's come up 3 times, the most out of any, and it came up last year, maybe, succession, respiration and something carbon cycle related, that's if we are expecting them to repeat similar questions! They'll probably introduce a new one to shock us all.

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sounds like AQA -.-

Reply 1586

barmutlu1

Original post by lalableh

If they give you the allele frequency & ask u about hetrozygotes frequency ,how do u calculate it ?

Square root it and find q/p by taking the answer away from 1 then simply times them together so p x q x 2

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Reply 1587

chemistrykid123

Describe who will win the world cup and why?

Reply 1588

MJ-17

Original post by chemistrykid123

Describe who will win the world cup and why?

Brazil, because it is heterozygous dominant for winning the World Cup.

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Reply 1589

Jaanu

Can someone explain to me 4ci jan 10 paper... i got 1:1.02...i'm sure u divide by the smallest no for ratio...please help :smile:

Reply 1590

MJ-17

Original post by MJ-17

Brazil, because it is heterozygous dominant for winning the World Cup.

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Homozygous* woops

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Reply 1591

09crane

Original post by MJ-17

NAD is involved in respiration
NADP is involved in photosynthesis

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Thank you

Reply 1592

lllllllllll

Original post by ΘTheta

What do you mean? How will the saprotroph take in nutrients from the matter its decayed? :confused:

A saprotroph can take in the nutrients by extra cellular digestion, making it a saprobiont as well. Or if it's a larger saprotroph such as a maggot, then it will take in nutrients simply by eating the dead organic matter.

(edited 9 years ago)

Reply 1593

ΘTheta

Original post by lllllllllll

A saprotroph can take in the nutrients by extra cellular digestion, making it a saprobiont as well. Or if it's a larger saprotroph, for example a maggot, then it will take in nutrients simply by eating the dead organic matter.

So saprotrophs are the same as saprobionts? :smile:

Reply 1594

woztar

Friday the 13th. Good luck to everyone sitting BIOL Unit4 :smile:

Reply 1595

SafaIqbal

Topics coming up ideas????

And 6 marker predictions?

Reply 1596

Yeeezy

Original post by ΘTheta

Hey!
If 51% is unbanded, then 49% is banded.
Banded is homozygous recessive. So, using P²+2pq+Q²=1
Q²=0.49 (as you do 49/100=0.49)
so Q=sqrt0.49=0.7
Since p+q=1, P=1-0.7=0.3
Hence hetrozygous is 2pq, so 2x0.7x0.3=0.42
Hence, 0.42x100=42% :biggrin:

So do you only sqrt if its homozygous recessive?

Reply 1597

Magenta96

Hi guys, you know if a question asks 'how is a leaf adapted for photosynthesis?', I know you say things like there are many chloroplasts, large, open air spaces etc, but are these IN the mesophyll cells?