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OCR A Level Biology A H420 Paper 1 6th June 2019 UNOFFICIAL MARKSCHEME

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Reply 80

Y.01.A

It was about how the receptors on the skin have a site that is complementary to the shape of ACh

Original post by LaurenSmith9699

What did people put for the question on the colour changing skin on the squid? lol

Reply 81

Sara saeed

Original post by AMberrose1234

The compared the haemoglobin one
Similarities
Made of different amino acids not repeating units
Both conjugated

Difference
4 polypeptide chains not 1
4 irons not 1

Difference I wrote was that Haemoglobin has two beta polypeptide and two alpha
And the other protein has disulfide bonds Haemoglobin doesn’t
I wrote these because before the question it said both have different tertiary and secondary structures

Reply 82

lynn55

Original post by LaurenSmith9699

What did people put for the question on the colour changing skin on the squid? lol

That light is a limiting factor and it absorbs blue light

Reply 83

yangy

i talked about the secondary messenger model

Original post by Y.01.A

It was about how the receptors on the skin have a site that is complementary to the shape of ACh

Reply 84

Ameliamabel

Original post by Elliefggj

I put noradrenaline and cortisol but think noradrenaline is wrong

noradrenaline is right x

Reply 85

yujin00

Probably confused the percentages as 10%? that's what I did at first and then noticed that it was 1.0%

Original post by lynn55

Loads of ppl getting 36000 for people teasing positive for testosterone and I don’t know why

Reply 86

normanis

I put RuBP instead of Ribulose Bisphosphate, is that fine?

Original post by j355j0n35

Agreed! But I put protein rather than amino acid🤦🏼*♀️

Reply 87

LaurenSmith9699

can anyone remember the multiple choice questions?

Reply 88

Ksims2604

I said both contain Fe prosthetic group and both quaternary structure but idk :smile:

Original post by Sara saeed

I wrote both contain Fe ion prosthetic group
What was the other similarity between Haemoglobin and the other protein?

Reply 89

stitche

The mcq talking about blood pressure with Na/k and Cl- what did people get for that?

Reply 90

yangy

me too

Original post by Ksims2604

I said both contain Fe prosthetic group and both quaternary structure but idk :smile:

Reply 91

AMberrose1234

In the blue light and limiting factor one
It would absorb red light if the colour of the plant is blue as it absorbs the opposite (like chloroplasts being green) and light wasn’t a limiting factor as it said if light is provided why does it level off meaning something else is the limiting factor

Reply 92

LaurenSmith9699

also what was the answer to the question about why the light independant reaction is known as the dark reaction?

Reply 93

Joesmurf1227

i got noradrenaline and thyroxine cant remember if the question stated where they were produced

Original post by archibald300

For a table near the end did anyone get
Aldosterone
Cortisol

Reply 94

elliothunt01

Original post by Sara saeed

I wrote both contain Fe ion prosthetic group
What was the other similarity between Haemoglobin and the other protein?

I just put both made of polypeptide chains of amino acids. Bit of waffle wasn’t too sure

Reply 95

aaisha.8994

2 and 3 ?

Original post by stitche

The mcq talking about blood pressure with Na/k and Cl- what did people get for that?

Reply 96

Megan2213

2 &3 as no potassium in kidneys

Original post by stitche

The mcq talking about blood pressure with Na/k and Cl- what did people get for that?

Reply 97

AMberrose1234

Original post by LaurenSmith9699

also what was the answer to the question about why the light independant reaction is known as the dark reaction?

It doesn’t use light in the Calvin cycle but it needs to ATP and NADP made from the light dependent reaction to work

Reply 98

Ellisjordan

I got -200 or something

Reply 99

Xx_InZain_xX

Original post by Tygasga

For independent variable i got: temperature
Dependent variable i got volume of oxygen (something like that)
For controlled i got light intensity
For the variable not controlled i put carbon dioxide concentration

For the graph question after i said something about how the rate of photosynthesis was highest at 30 degrees because of steeper gradient etc etc. Also said that the enzymes don't denature at high temperatures (something along those lines anyways)