OCR GCSE Biology A Paper 3 (Higher) - Tuesday, May 13, 2025 [Exam Chat]

Reply 20

h.16267

1

Original post by Fthfy

What was the solution X

was it not starch solution omg

Reply 21

sallycakes

5

Original post by RevanthSambangi

Wth is a chemical neurotransmitter nobody I asked knew what it was

how the electrical impulse travels from neurone to neurone even tho there’s a synapse gap; chemical neurotransmitter diffuses across the synapse and binds to the receptor molecule in the next neurone . it was only 2 marks anyway, but i memorised it right before the exam from the cgp guide so im gutted its not worth more 😭

Reply 22

Aira Jamil

1

Original post by 183483279435829

One was iodine to test for starch the other one was potassium hydroxide or soda lime as it absorbs co2.

Was it not Benedict’s reagent for solution x

Reply 23

183483279435829

6

Does anyone know if the how to treat diabetes question was for type 1 or type 2 as I put regular exercise and eating more slow release carbohydrates.

Reply 24

183483279435829

6

Original post by Olivia...123

I think it is soda lime solution becuase that absorbs carbon dioxide

Soda lime or potassium hydroxide

Reply 25

183483279435829

6

Original post by RevanthSambangi

Wth is a chemical neurotransmitter nobody I asked knew what it was

When the electrical impulse reaches the synapses it triggers the release of transmitter chemicals which diffuse across the synapses and bind to receptor sites in the membrane of the next neurone setting off a new electrical impulse.

Reply 26

183483279435829

6

Original post by Aira Jamil

Was it not Benedict’s reagent for solution x

Benedict’s tests for reducing sugars

Reply 27

183483279435829

6

Does anyone know if the how to treat diabetesquestion was for type 1 or type 2 as I put regularexercise and eating more slow releasecarbohydrates. Also what were the difficulties for the dopamine question and issues for the coss in stables question?

Reply 28

nobody knows

7

Original post by 183483279435829

Soda lime or potassium hydroxide

yay i put soda lime

Reply 29

nobody knows

7

Original post by 183483279435829

Does anyone know if the how to treat diabetesquestion was for type 1 or type 2 as I put regularexercise and eating more slow releasecarbohydrates. Also what were the difficulties for the dopamine question and issues for the coss in stables question?

for type 2 diabetes questions i spoke about excersises especially after heavy glucose meals so that blood glucose levels will be balanced

Reply 30

sofiaamella

1

Original post by 183483279435829

Soda lime or potassium hydroxide

could sodium hydroxide work?

Reply 31

20-pirakat-R

1

Original post by h.16267

was it not starch solution omg

for one of them i got soda lime and the other was iodine?

Reply 32

20-pirakat-R

1

what did people get for the haemoglobin question - about why do people with diabetes have more HbA1c or something along the lines of that

Reply 33

Jessica3837377

2

what did u put for shape and location for eukaryotic and prokaryotic cell and for the osmosis question (the multiple choice) with the bag what did you put

Reply 34

183483279435829

6

Original post by sofiaamella

could sodium hydroxide work?

idk but I doubt it. Sodalime and potassium hydroxide absorb co2, those are the ones I've seen in practicals but I'm not sure about anything else.

Reply 35

ndae

Original post by Jessica3837377

what did u put for shape and location for eukaryotic and prokaryotic cell and for the osmosis question (the multiple choice) with the bag what did you put

I put for the location in eukaryotic it's in the nucleus and in prokaryotic it floats in the cytoplasm and for shape I put double helix for eukaryotic idk abt prokaryotic tho. for the MC I put c it was that the water diffuses into the thingy by osmosis

Reply 36

183483279435829

6

Original post by 20-pirakat-R

what did people get for the haemoglobin question - about why do people with diabetes have more HbA1c or something along the lines of that

People with type 1 diabetes: pancreas doesn't produce insulin, and people with type 2: body doesn't respond to insulin. Either way therefore they also won't have the effects of insulin. Insulin takes glucose out of the bloodstream into muscle and liver cells, and enzymes in those cells convert the glucose into glycogen which is then stored, bringing blood glucose level back down to the optimum. However if that doesn't happen less glucose will be taken out of the bloodstream so more glucose will be in the bloodstream bound to the red blood cells.

Reply 37

Jupiter55

8

Original post by Jessica3837377

what did u put for shape and location for eukaryotic and prokaryotic cell and for the osmosis question (the multiple choice) with the bag what did you put

Shape- in prokaryotic I put it’s one long circular dna strand but it eukaryotic I put dna is in chromosomes
Location- in prokaryotic it’s floating free in the cytoplasm, but eukaryotic it’s within the nucleus

and then for multiple choice I remember there being a past paper question on this. The starch molecules are too bag so they can’t move out of the membrane bag. The water is small enough to move into the membrane bag. So I put water moves into the bag by osmosis increasing the water line (I think it was option b?)

Reply 38

183483279435829

6

Original post by ndae

I put for the location in eukaryotic it's in the nucleus and in prokaryotic it floats in the cytoplasm and for shape I put double helix for eukaryotic idk abt prokaryotic tho. for the MC I put c it was that the water diffuses into the thingy by osmosis

In prokaryotic there are plasmids and chromosomal/loop of dna. Either way its circular as they are both loops of dna, just the chromosomal dna controls activities/replication and plasmids contain genes for things like antibiotic resistance and can be passed between bacteria.

Reply 39

183483279435829

6

Original post by Jupiter55

Shape- in prokaryotic I put it’s one long circular dna strand but it eukaryotic I put dna is in chromosomes
Location- in prokaryotic it’s floating free in the cytoplasm, but eukaryotic it’s within the nucleus
and then for multiple choice I remember there being a past paper question on this. The starch molecules are too bag so they can’t move out of the membrane bag. The water is small enough to move into the membrane bag. So I put water moves into the bag by osmosis increasing the water line (I think it was option b?)

I thought it would decrease the water potential of the solution, so i put that water would move in. however I heard that starch actually wouldn't bring down the water potential so im not sure.

OCR GCSE Biology A Paper 3 (Higher) - Tuesday, May 13, 2025 [Exam Chat]

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