AQA A-Level Biology Paper 3 (7402/3) - 19th June 2024 [Exam Chat]

Reply 60

Atif Siddique

6

Original post by zoella A

Guys can we just get an essay stating the importance of nitrogen or would it say nitrogen containing compounds

I don't think your answer would change?

Reply 61

hehepaldhd

8

Ok this is probably such a stupid question but i've been practicing essays and it just keeps coming up and stumping me. So i'm talking about cohesion-tension theory (e.g in 'importance of water') and im so confused about why water moving up the plant is actually important?? likee just so it can reach cells at the top? im sorry im so confused

Reply 62

hehepaldhd

8

Original post by hehepaldhd

Ok this is probably such a stupid question but i've been practicing essays and it just keeps coming up and stumping me. So i'm talking about cohesion-tension theory (e.g in 'importance of water') and im so confused about why water moving up the plant is actually important?? likee just so it can reach cells at the top? im sorry im so confused

also one question : is cohesion tension theory too irrelevant to talk about in an essay on the importance of diffusion

Reply 63

george flowberry

10

Original post by hehepaldhd

Ok this is probably such a stupid question but i've been practicing essays and it just keeps coming up and stumping me. So i'm talking about cohesion-tension theory (e.g in 'importance of water') and im so confused about why water moving up the plant is actually important?? likee just so it can reach cells at the top? im sorry im so confused

maintains structure of stem and keeps plant upright?
allows for water to move from roots to leaves which can then be used in photosynthesis etc

Reply 64

m3131

5

hey, are the topics on paper 3 going to be the ones not included in 1+2, or will some topics come up again? like can we prepare by eliminating the topics in the other papers

Reply 65

itjirl

8

Original post by m3131

hey, are the topics on paper 3 going to be the ones not included in 1+2, or will some topics come up again? like can we prepare by eliminating the topics in the other papers

nah they're gonna have some of the same topics come up again but ones having not come up on 1+2 is still an indicator that they might be on paper 3 :smile:

Reply 66

hwciez

1

guys what 5 topics could be used for an essay on importance of water, i can't think of any from paper 2 besides osmoregulation

Reply 67

maxchri

9

Original post by hwciez

guys what 5 topics could be used for an essay on importance of water, i can't think of any from paper 2 besides osmoregulation

there’s stuff for both year 1 and year 2 content, so apart from osmoregulation you could talk about:
• waters role in metabolic processes such as photolysis in the light-dependent reaction of photosynthesis, could talk about hydrolysis reactions for lots of different topics e.g. hydrolysis of ATP
• hydrogen bonding giving water its cohesive property and link to cohesion-tension theory in xylem, and also waters role in translocation in phloem allowing for mass flow
• hydrostatic pressure of blood plasma, could link to tissue fluid and osmosis, could also link to osmoregulation and ultrafiltration
• waters role in the counter-current system for gills in fish and the importance of the oxygen concentration gradient
• other properties of water such as its high latent heat of vaporisation providing a cooling effect and its high specific heat capacity acting as buffer to temperature changes

Reply 68

remorse

2

Original post by hehepaldhd

Ok this is probably such a stupid question but i've been practicing essays and it just keeps coming up and stumping me. So i'm talking about cohesion-tension theory (e.g in 'importance of water') and im so confused about why water moving up the plant is actually important?? likee just so it can reach cells at the top? im sorry im so confused

I think its about needing water at the leaves for photolysis in the light dependent reaction of photosynthesis

Reply 69

remorse

2

I dont think these have come up yet and if they have prob just a tinyy bit?
Cardiac cycle
Mass transport in plants, fish, insects
Haemoglobin
Sodium potassium pump
Immunity
Respiration
PCR
resting potential
Osmoregulation
The eye
Pacinian corpuscle
Epistasis
Taxis & kinesis
Stem cells
Nitrogen/phosphorus cycle
Control blood glucose
Protein structure, bondings (& exo/endopeptidases)
Aseptic technique
Structure of nephron
Oestrogen TF & cancer
TF acetylation/methylation
Conservation/farming
Biomass… N=I-(F+R)
Virus?
HIV?
Antibodies?
Meselson stahl N experiment

Reply 70

Smart282

16

anyone got a quizlet deck covering the whole content in a concise way pls ? its getting so hard to balance chem with bio

Reply 71

ftwlai

6

Original post by remorse

I dont think these have come up yet and if they have prob just a tinyy bit?
Cardiac cycle
Mass transport in plants, fish, insects
Haemoglobin
Sodium potassium pump
Immunity
Respiration
PCR
resting potential
Osmoregulation
The eye
Pacinian corpuscle
Epistasis
Taxis & kinesis
Stem cells
Nitrogen/phosphorus cycle
Control blood glucose
Protein structure, bondings (& exo/endopeptidases)
Aseptic technique
Structure of nephron
Oestrogen TF & cancer
TF acetylation/methylation
Conservation/farming
Biomass… N=I-(F+R)
Virus?
HIV?
Antibodies?
Meselson stahl N experiment

no index of diversity either

Reply 72

lanadeltay

10

guys cld we get asked something like causes of disease?? I think it's been asked in the past but I wld be so stumped if I got that

Reply 73

catie1234_9

8

Original post by hehepaldhd

Ok this is probably such a stupid question but i've been practicing essays and it just keeps coming up and stumping me. So i'm talking about cohesion-tension theory (e.g in 'importance of water') and im so confused about why water moving up the plant is actually important?? likee just so it can reach cells at the top? im sorry im so confused

Miss Estruch explained that its important as it provides water to the cells. Which you can then link the importance of the water in the cells in the light dependent reaction in Photosynthesis. Then to finish that you can explain why Photosynthesis is important for the plant. My teacher always tells me to then link back if its about plants why having no plants taking place and how that would impact other organisms. Such as having no plants there would be lots of Carbon Dioxide therefore, making the environment uninhabitable. I think it might be too much information, but when I have done this I have scored better on the essays :smile:

Reply 74

catie1234_9

8

Original post by lanadeltay

guys cld we get asked something like causes of disease?? I think it's been asked in the past but I wld be so stumped if I got that

I don't think so as it we could only really talk about HIV and the immune system. I think it would be too vague. But I feel like they could ask this question but link it to other topics. Maybe something to do with mutations and that sort of thing

Reply 75

Dylan_Ford

10

Hear me out, biologically speaking, pineapple on pizza or no?

Reply 76

kelloggss

9

Original post by catie1234_9

I don't think so as it we could only really talk about HIV and the immune system. I think it would be too vague. But I feel like they could ask this question but link it to other topics. Maybe something to do with mutations and that sort of thing