The Student Room Group

Unofficial Mark scheme GCSE AQA Trilogy Combined Biology Paper 1 Higher 10th May 2024

send the questions and answers here ill edit
P.S the answers may not be correct so just lmk below.
1.1) Fructose is sweeter than glucose. Suggest why fructose was used instead of glucose
- Do not refer to sweetness. [2]
More soluble
Cheaper

1.2) Describe the test for Sugars and the result? [3]
Add Benedict's solution to a testing tube
Heat in hot water bath
Result: brick red

1.3) Describe the test for Proteins and the result? [3]
Add Biuret solution to test tube with 5cm^3 of food molecule
Mix
Result: Purple

1.4) Describe how proteins and fats are digested [6]
- You should include where enzymes are produced
- What enzymes are used
Fats are broken down by lipase enzymes which produce fatty acids and glycerol.
Protein are broken down by protease enzymes which produced individual amino acids.
Protein is produced In the stomach
Fats are produced in the pancreas

2.1) What is the independent variable within this practical? [1]
The Salt concentration of the solution.

2.2) The student dried the outside of each tube with a paper towel before recording the mass.
-Why was this important? [1]
To reduce extra weight gained from water.

2.3) Calculate value X in table. [3]
0.6%

2.4) Plot the percentage change for mass [3]
Plot table

2.5)
What is the concentration of solution Z in the graph? [1]
0.66cm^3

3.1) What type of microorganisms causes measles? [1]
Virus

3.2) Suggest two ways the spread of measles can be reduced. [2]
Wearing a mask/face covering
Put hands over mouth/nose while coughing/sneezing to prevent droplets spreading.

3.3) Describe how the measles vaccine helps a person to become immune to the measles pathogen? [4]
Vaccine contains dead/weakened version
Not enough to cause the disease
White blood cells detect this and produce antibodies

3.4) Explain how viruses cause illnesses? [2]



3.5) Give three reasons why clinical trials are needed? [3]
Check for safety/toxicity
Look for optimum dosage
Check for side affects

4.1) What is the equation for Photosynthesis? [1]
6CO2+6H2O→C6H12O6+6O2

4.2) Describe the effect of increasing temperatures on the rate of photosynthesis. [3]




4.3) Explain why no gas was produced by the plant at 45 degrees Celsius. [2]



4.4) How could the student increase the accuracy of the results? [1]


4.5) Suggest two reasons against using a heater set at 25 degrees Celsius in the greenhouse. [2]



4.6) Which tissue in the cut stem will differentiate into new root cells? [1]
Meristem

5.1) What type of microscope was used to view the bacteria in the picture? [1]



5.2) Describe 3 differences between prokaryotic and eukaryotic cell. [3]
The DNA in a prokaryotic cell are loops in the cytoplasm.
Prokaryotic doesn't have nucleus whilst eukaryotic cells do.
Prokaryotic cells are smaller than eukaryotic cells.

5.3) Calculate magnification of the cell. [5]


6.1) Describe the cell cycle as shown in the diagram. [4]
The nucleus dissolves and genetic material is duplicated.
The sets of chromosomes are pulled apart to each end of the cell.
The nucleus divides
Cytokinesis occurs and the cell divides into two genetically identical daughter cells.

6.2) Explain by what is meant by Malignant tumours? [3]
Spread to the rest of the body via the blood invade neighbouring tissues.
Form secondary tumours
They are cancerous

6.3) There are two images of a person's alveolus who doesn't smoke and a picture with who does.
Explain why the smoker breathes more. [4]
Non smoker alveolus has a larger surface area
So more diffusion of oxygen
Less breaths needed for enough oxygen to get to body cells (Smokers alveolus is opposite)

7.) A person has a disease called Angina. The symptoms of this disease are:
- Tiredness
- Chest pain
A drug known as GTN is used to relieve the symptoms of Angina,
Explain how GTN helps to relieve the symptoms. [6]
CHD is where fatty material is deposited in coronary arteries
This reduces blood flow so lack of oxygen pumped to body cells
Tiredness is due to the lack of oxygen in the cells
GTN causes the coronary arteries to widen so more blood flow and oxygen being pumped around the body.
(edited 1 month ago)

Scroll to see replies

Reply 1
Fructose is sweeter than glucose

Suggest why fructose was used instead of glucose.
Do not refer to sweetness.

Easy to obtain

Costs less as less quantity is needed

Reply 2
Original post by Murdazx
send the questions and answers here ill edit
P.S the answers may not be correct so just lmk below.
Fructose is sweeter than glucose. Suggest why fructose was used instead of glucose
Do not refer to sweetness. [2]
More soluble
Cheaper
Describe the test for Sugars and the result? [3]
Add Benedict's solution to a testing tube
Heat in hot water bath
Result: brick red
Describe the test for Proteins and the result? [3]
Add Biuret solution to test tube with 5cm^3 of food molecule
Mix
Result: purple
What type of pathogen are measles? [1]
Virus
What is the equation for Photosynthesis? [1]
6CO2+6H2O→C6H12O6+6O2

Two ways to reduce the spread of measles
Isolation
Wear face covering and gloves 2 marks

Malignant tumours spread to the rest of the body via the blood invade neighbouring tissues. Form secondary tumours they are cancerous
3 marks
Reply 3
How does the measles vaccine prevent the spread of measles[4]
(edited 1 month ago)
Original post by Murdazx
send the questions and answers here ill edit
P.S the answers may not be correct so just lmk below.
Fructose is sweeter than glucose. Suggest why fructose was used instead of glucose
Do not refer to sweetness. [2]
More soluble
Cheaper
Describe the test for Sugars and the result? [3]
Add Benedict's solution to a testing tube
Heat in hot water bath
Result: brick red
Describe the test for Proteins and the result? [3]
Add Biuret solution to test tube with 5cm^3 of food molecule
Mix
Result: purple
What type of pathogen are measles? [1]
Virus
What is the equation for Photosynthesis? [1]
6CO2+6H2O→C6H12O6+6O2


Benedicts +ve results could be green yellow or brick red
Reply 5
Describe how proteins and fats are digested [6]

You should include where enzymes are produced

What enzymes are used

Reply 6
A person has a disease called Angina. The symptoms of this disease are:

1.

Tiredness

2.

Chest pain

A drug known as GTN is used to relieve the symptoms of Angina

Explain how GTN helps to relieve the symptoms. [6]
Reply 7
Original post by batwings
Describe how proteins and fats are digested [6]

You should include where enzymes are produced

What enzymes are used


Fats are broken down by lipase enzymes which produce glycerol and fatty acids
Protein are broken down by protease enzymes which produced individual amino acids.
Protein is produced In the stomach
Fats are produced in the pancreas

That's all I wrote lol
Original post by batwings
Describe how proteins and fats are digested [6]

You should include where enzymes are produced

What enzymes are used



Proteins are broken into:

-amino acids

-by protease - enzyme
-protease is found in the liver, small intestine and pancreas

Fats are lipids and they are broken down into:
-Glycerol and fatty acids
-by lipases
-lipases are found in the pancreas and small intestine

That's what i wrote, i think it is worth 5 or 6 marks
Reply 9
Original post by Yusuf777
Fats are broken down by lipase enzymes which produce glycerol and fatty acids
Protein are broken down by protease enzymes which produced individual amino acids.
Protein is produced In the stomach
Fats are produced in the pancreas
That's all I wrote lol

same same, i wrote abt bile also and that the amino acids are then joined back up by the body to build human proteins
Original post by lak123455
Proteins are broken into:
-amino acids
-by protease - enzyme
-protease is found in the liver, small intestine and pancreas
Fats are lipids and they are broken down into:
-Glycerol and fatty acids
-by lipases
-lipases are found in the pancreas and small intestine
That's what i wrote, i think it is worth 5 or 6 marks


Thats not liver its stomach
Original post by lak123455
Thats not liver its stomach

yhyh what i put
Original post by batwings
A person has a disease called Angina. The symptoms of this disease are:

1.

Tiredness

2.

Chest pain

A drug known as GTN is used to relieve the symptoms of Angina
Explain how GTN helps to relieve the symptoms. [6]

what abt this 6 marker, i put its a statin which helps lower cholesterol, preventing further build up of fats in the coronary arteries....
what did everyone get for the magnification question that was 5 marks
i got x800
i done 36000 divided by 45 to give me x800
Original post by tasmiiyah406
what did everyone get for the magnification question that was 5 marks
i got x800
i done 36000 divided by 45 to give me x800

yh i think u got it correct i got 666.7 which im sure is wrong, as i didnt measure the image, icl the question wasnt the best worded, just spat info at u saying work out magnification...
Original post by batwings
yh i think u got it correct i got 666.7 which im sure is wrong, as i didnt measure the image, icl the question wasnt the best worded, just spat info at u saying work out magnification...


Samee
Original post by batwings
How does the measles vaccine prevent the spread of measles[3]

thought this was a four marker
Original post by tasmiiyah406
what did everyone get for the magnification question that was 5 marks
i got x800
i done 36000 divided by 45 to give me x800

i got 800 aswell did the same method by converting mm to um
Original post by sarakhan67
thought this was a four marker

yh now that i think of it, yh it was
what did anyone get for the graph with the line of best fit and it asks for z. i got 6.5

Quick Reply

Latest

Trending

Trending