AS Biology (F211) - Jan 2013 Unofficial Mark Scheme Watch

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thesmallprint
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#41
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(Original post by niveous)
thank you so much, according to this, I got 49 despite getting the entire of that 5 mark question wrong cause I thought it wanted me to talk about the cytoskeleton... fml... anyway, thanks!
Same, I completely went off on one and used the mammalian gaseous exchange system as an example for that 5 marker and talked about how cells are organised there...luckily looking at the rest of the paper, it was solid enough to almost discount the 5 marks.
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Ray..
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#42
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(Original post by SomePotential)
I tried to come up with the questions and answers from memory, so feel free to correct me where I'm wrong

1.
a. List three reasons why large animals, such as mammals, need a transport system. [3]
  • Small Surface Area:Volume ratio/Idea diffusion too slow;
  • High metabolic activity requires a lot of nutrients;
  • Cells near the surface can get the nutrients/nutrients used up by the time they reach cells deeper in the organism;
  • Transport system needed to supply cells deeper in the organism




b. Give the full name of the diagram used to measure electrical impulses. [1]

  • Electrocardiogram (trace);



c. Give the name of the labels A and B in the Insert. [2]
  • A - Sinoatrial Node/Pacemaker;
  • B - Atrioventricular Node;



d. Why is it important that the electrical impulse is delayed? [2]

  • Allows the blood to flow into the ventricles from the atria;
  • Increasing the blood pressure in the ventricles;
  • Causing the aortic/pulmonary valves to open;



e. Explain why the electrical impulse travels to the apex of the heart. [2]
  • To create the contraction of the ventricles from the bottom;
  • To push the blood up and out of the aorta/pulmonary artery;



2.
a. What is the name of the process of asexual reproduction in yeast cells? [1]
  • Budding/Binary Fission;



b. Outline the process of asexual reproduction in yeast cells. [2]
  • Mitosis occurs in the nucleus of the yeast cell;
  • A bulge develops on the side of the cell;
  • Cell membrane remains intact/cell organelles move the the bud;
  • bud splits from the yeast cell to produce a genetically identical daughter cell;



c. Ignoring the number of scars on the diagram, calculate the number of times the yeast cell could reproduce. [2]
  • Mark for working - Surface Area of Yeast Cell / Area of Scar - (4*3.14*1.52)/(3.14*0.52);
  • Mark for answer - 36;



d. Explain why the yeast cell might not be able to reproduce to its potential. [2]
  • Scars are circular;
  • So can not occupy total surface area/spaces between circular scars;
    or
  • Cell Cycle mainly in Interphase;
  • So yeast Cells may die before reproducing 36 times;



e. (QWC) Explain how cells are organised in a multicellular organism [5]
  • A tissue is a group of cells working together to perform a function;
  • Example of tissue/function;
  • An organ is a group of tissues working together to perform a function;
  • Example of organ/function;
  • An organ system is a group of organs working together to perform a life function;
  • Example of organ system/function;
  • AVP;
  • Use of 3 of the following words in correct context: tissue, organ, organ system, specialised...



3.
a. What is missing from the students table? [2]
  • Units of Measurement;
  • Used to calculate rate of bubble movement;
    or
  • Table of results;
  • Used to calculate mean rate.



b. Describe and explain the results on the table. [3]
  • As the number of leaves increase, the mean rate of bubble movement increases;
  • Use of figures from the table;
  • Increased number of stomata/surface area;
  • Increase in transpiration;



c. Explain why the students statement would effect the result and how he could improve the experiment. [6]
  • Different Size leaves result in difference number of stomata/larger surface area;
  • Use shoots with similar size leaves;
  • Wet leaves creates a humid microclimate/Reduces water potential gradient;
  • Wait for the leaves to dry;
  • Heat increases rate of evaporation/Light causes stomata to open;
  • Control the temperature/light intensity e.g. windowless room;



4.
a. Complete the gaps in the paragraph. [3]
  • Fluid Mosaic Model;
  • Active;
  • Lipids/Oxygen/Carbon Dioxide;
  • Carrier
b. Explain what the term cell signalling means. [1]
  • Cell Signalling is a process that leads to communication and coordination between cells;
  • Example of cell signalling;



c. (QWC) Explain the process of cell signalling. [4]
  • Glycoproteins/Glycolipids in plasma membrane;
  • Receptor;
  • Cell Signalling Molecule/Example e.g. hormones/enzymes;
  • Bind to receptor;
  • Which has a complimentary shape;
  • Use 3 of the following terms in correct context: Receptor, Glycolipid, Glycoprotein, Complimentary shape...



5.
a. Which organelles are present in a plant cell, animal cell and bacterial cell? [4]

Table































Cell Feature
Plant Cell
Animal Cell
Bacterial Cell
Chloroplast
Present
Absent
Absent
Cellulose Cell Wall
Present
Absent
Absent
Centrioles
Absent
Present
Absent
Ribosomes
Present
Present
Present

1 mark for each correct row.



b. Which test tubes contained the following organelles? [4]
  • Nuclei - 1;
  • Ribosomes - 4
  • Mitochondria - 2
  • Lysosomes - 2



c. Which organelle from above is the smallest? [1]
  • Ribosome;



6.
a. Explain the importance of lignin. [3]
  • Waterproofs xylem vessel wall/Stops water loss from Xylem wall;
  • Creates pits to allow water transport from Xylem vessel to other tissues;
  • Pattern in Lignin allows it to be flexible;
  • Supports the Xylem vessel/stops it from collapsing;



b. Explain the importance of cartilage. [3]
  • C - rings to allow movement of food in trachea
  • Gives support to the trachea;
  • Stops it from collapsing during inhalation;
  • Allows the neck to bend without damaging trachea;



c. Comment on the data about surface area and volume of the body/lungs. [3]
  • Small Surface Area:Volume ratio
  • Insufficient for bodys need;
  • Need a specialised exchange surface;
  • Such as alveoli;
  • Which has a large surface area for more gaseous exchange;

Please note, these are only some of a wide range of answer. If you're answer isn't on here, it could still be correct.
For question 1, you could also state that large multicellular animals have a high demand of oxygen. As for question 6 (A) ligin is also waterproof which aids in adhesion of water molecules
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BioGeek
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#43
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#43
Electro-cardio graph is creditworthy and not gram, as it is asking for the RATE
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xKaylax
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#44
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#44
Thought I'd done really badly in this exam but after looking at the questions again with the mark scheme, I realsied I've probably only lost about 10ish marks through my few mistakes/misinterpretaions so I'm guessing I've scored about 47/48.. maybe 45 at the lowest! So hopefully I'll still get that A I need!! Thanks for putting this up Wish all my exams had an unofficial mark scheme to look at! March seems like such a long time away to wait for results..
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bumbakrak
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#45
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#45
According to this i got 51-52/60....Would this possibly be an A?? Thanks
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Fabbiha
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#46
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#46
I read one of the posts which said that the grade boundaries for this paper would be similar to that of last years..last years paper had a lower grade boundary because it was considerably harder..the grade boundaries for an A usually sit around 47/48/49 marks out if sixty. Judging by how this paper was i think the grade boundaries are higher this time round.
I was wondering, how exactly do you know what the answers might be and do you copy the exam questions from memory? The chances are that the mark scheme maybe too broad in the range of answers that can be given, or that the mark scheme on here is too narrow.. Either way, its scary

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Mule
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#47
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#47
(Original post by Fabbiha)
I read one of the posts which said that the grade boundaries for this paper would be similar to that of last years..last years paper had a lower grade boundary because it was considerably harder..the grade boundaries for an A usually sit around 47/48/49 marks out if sixty. Judging by how this paper was i think the grade boundaries are higher this time round.
I was wondering, how exactly do you know what the answers might be and do you copy the exam questions from memory? The chances are that the mark scheme maybe too broad in the range of answers that can be given, or that the mark scheme on here is too narrow.. Either way, its scary

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Marks out of 60 for an A

Jan 2012 - 43
Jan 2011 - 42
Jan 2010 - 40
Jan 2009 - 46

Don't see any here 47 +...
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Fabbiha
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#48
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#48
Yes i am aware of those grade boundaries, but i was always told you should aim for getting 80% which is an A. 80% in a bio or any 60 mark ocr science exam would mean getting a minimum of 48/60 which is 80%.

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Emmjaay
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#49
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#49
Is the exam out of 60?


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phaseshift
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#50
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(Original post by Emmjaay)
Is the exam out of 60?


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Yep.
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AKA26
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#51
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#51
(Original post by QuantumSuicide)
There are quite a few controversial answers on here. Some marks are also incorrect...
last question is ''high surface area to volume ratio''
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AKA26
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#52
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I am pretty sure the last question is wrong, it's high surface area to volume ratio
(Original post by SomePotential)
I tried to come up with the questions and answers from memory, so feel free to correct me where I'm wrong

1.
a. List three reasons why large animals, such as mammals, need a transport system. [3]
  • Small Surface Area:Volume ratio/Idea diffusion too slow;
  • High metabolic activity requires a lot of nutrients;
  • Cells near the surface can get the nutrients/nutrients used up by the time they reach cells deeper in the organism;
  • Transport system needed to supply cells deeper in the organism




b. Give the full name of the diagram used to measure electrical impulses. [1]

  • Electrocardiogram (trace);



c. Give the name of the labels A and B in the Insert. [2]
  • A - Sinoatrial Node/Pacemaker;
  • B - Atrioventricular Node;



d. Why is it important that the electrical impulse is delayed? [2]

  • Allows the blood to flow into the ventricles from the atria;
  • Increasing the blood pressure in the ventricles;
  • Causing the aortic/pulmonary valves to open;



e. Explain why the electrical impulse travels to the apex of the heart. [2]
  • To create the contraction of the ventricles from the bottom;
  • To push the blood up and out of the aorta/pulmonary artery;



2.
a. What is the name of the process of asexual reproduction in yeast cells? [1]
  • Budding/Binary Fission;



b. Outline the process of asexual reproduction in yeast cells. [2]
  • Mitosis occurs in the nucleus of the yeast cell;
  • A bulge develops on the side of the cell;
  • Cell membrane remains intact/cell organelles move the the bud;
  • bud splits from the yeast cell to produce a genetically identical daughter cell;



c. Ignoring the number of scars on the diagram, calculate the number of times the yeast cell could reproduce. [2]
  • Mark for working - Surface Area of Yeast Cell / Area of Scar - (4*3.14*1.52)/(3.14*0.52);
  • Mark for answer - 36;



d. Explain why the yeast cell might not be able to reproduce to its potential. [2]
  • Scars are circular;
  • So can not occupy total surface area/spaces between circular scars;
    or
  • Cell Cycle mainly in Interphase;
  • So yeast Cells may die before reproducing 36 times;



e. (QWC) Explain how cells are organised in a multicellular organism [5]
  • A tissue is a group of cells working together to perform a function;
  • Example of tissue/function;
  • An organ is a group of tissues working together to perform a function;
  • Example of organ/function;
  • An organ system is a group of organs working together to perform a life function;
  • Example of organ system/function;
  • AVP;
  • Use of 3 of the following words in correct context: tissue, organ, organ system, specialised...



3.
a. What is missing from the students table? [2]
  • Units of Measurement;
  • Used to calculate rate of bubble movement;
    or
  • Table of results;
  • Used to calculate mean rate.



b. Describe and explain the results on the table. [3]
  • As the number of leaves increase, the mean rate of bubble movement increases;
  • Use of figures from the table;
  • Increased number of stomata/surface area;
  • Increase in transpiration;



c. Explain why the students statement would effect the result and how he could improve the experiment. [6]
  • Different Size leaves result in difference number of stomata/larger surface area;
  • Use shoots with similar size leaves;
  • Wet leaves creates a humid microclimate/Reduces water potential gradient;
  • Wait for the leaves to dry;
  • Heat increases rate of evaporation/Light causes stomata to open;
  • Control the temperature/light intensity e.g. windowless room;



4.
a. Complete the gaps in the paragraph. [3]
  • Fluid Mosaic Model;
  • Active;
  • Lipids/Oxygen/Carbon Dioxide;
  • Carrier
b. Explain what the term cell signalling means. [1]
  • Cell Signalling is a process that leads to communication and coordination between cells;
  • Example of cell signalling;



c. (QWC) Explain the process of cell signalling. [4]
  • Glycoproteins/Glycolipids in plasma membrane;
  • Receptor;
  • Cell Signalling Molecule/Example e.g. hormones/enzymes;
  • Bind to receptor;
  • Which has a complimentary shape;
  • Use 3 of the following terms in correct context: Receptor, Glycolipid, Glycoprotein, Complimentary shape...



5.
a. Which organelles are present in a plant cell, animal cell and bacterial cell? [4]

Table































Cell Feature
Plant Cell
Animal Cell
Bacterial Cell
Chloroplast
Present
Absent
Absent
Cellulose Cell Wall
Present
Absent
Absent
Centrioles
Absent
Present
Absent
Ribosomes
Present
Present
Present

1 mark for each correct row.



b. Which test tubes contained the following organelles? [4]
  • Nuclei - 1;
  • Ribosomes - 4
  • Mitochondria - 2
  • Lysosomes - 2



c. Which organelle from above is the smallest? [1]
  • Ribosome;



6.
a. Explain the importance of lignin. [3]
  • Waterproofs xylem vessel wall/Stops water loss from Xylem wall;
  • Creates pits to allow water transport from Xylem vessel to other tissues;
  • Pattern in Lignin allows it to be flexible;
  • Supports the Xylem vessel/stops it from collapsing;



b. Explain the importance of cartilage. [3]
  • C - rings to allow movement of food in trachea
  • Gives support to the trachea;
  • Stops it from collapsing during inhalation;
  • Allows the neck to bend without damaging trachea;



c. Comment on the data about surface area and volume of the body/lungs. [3]
  • Small Surface Area:Volume ratio
  • Insufficient for bodys need;
  • Need a specialised exchange surface;
  • Such as alveoli;
  • Which has a large surface area for more gaseous exchange;

Please note, these are only some of a wide range of answer. If you're answer isn't on here, it could still be correct.
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Kitnimohabbathai
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#53
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#53
Where can i find the unofficial mark scheme for ocr biology unit 2- january 2013?
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OurOldFriendtheE
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#54
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#54
I have the mark scheme in front of me and this Unofficial Mark Scheme is way off on many questions
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the-chosen-one
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#55
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#55
(Original post by OurOldFriendtheE)
I have the mark scheme in front of me and this Unofficial Mark Scheme is way off on many questions
Could you post it please? It would really help a lot of people
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doctorsunny
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#56
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#56
Hi can someone please please send me the mark scheme for this paper? thanks
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coolie95
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#57
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#57
(Original post by OurOldFriendtheE)
I have the mark scheme in front of me and this Unofficial Mark Scheme is way off on many questions
How is it way offf? And could you send me the proper mark scheme if u hve it pls?
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megan1096
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#58
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#58
Is anyone able to post the official mark scheme?
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ChooChooCherry
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#59
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#59
(Original post by megan1096)
Is anyone able to post the official mark scheme?
have u gotten hold of the mark scheme yet? im in dire need :'(
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HKA1998
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#60
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#60
(Original post by SomePotential)
I tried to come up with the questions and answers from memory, so feel free to correct me where I'm wrong

1.
a. List three reasons why large animals, such as mammals, need a transport system. [3]
  • Small Surface Area:Volume ratio/Idea diffusion too slow;
  • High metabolic activity requires a lot of nutrients;
  • Cells near the surface can get the nutrients/nutrients used up by the time they reach cells deeper in the organism;
  • Transport system needed to supply cells deeper in the organism





b. Give the full name of the diagram used to measure electrical impulses. [1]

  • Electrocardiogram (trace);




c. Give the name of the labels A and B in the Insert. [2]
  • A - Sinoatrial Node/Pacemaker;
  • B - Atrioventricular Node;




d. Why is it important that the electrical impulse is delayed? [2]

  • Allows the blood to flow into the ventricles from the atria;
  • Increasing the blood pressure in the ventricles;
  • Causing the aortic/pulmonary valves to open;




e. Explain why the electrical impulse travels to the apex of the heart. [2]
  • To create the contraction of the ventricles from the bottom;
  • To push the blood up and out of the aorta/pulmonary artery;




2.
a. What is the name of the process of asexual reproduction in yeast cells? [1]
  • Budding/Binary Fission;




b. Outline the process of asexual reproduction in yeast cells. [2]
  • Mitosis occurs in the nucleus of the yeast cell;
  • A bulge develops on the side of the cell;
  • Cell membrane remains intact/cell organelles move the the bud;
  • bud splits from the yeast cell to produce a genetically identical daughter cell;




c. Ignoring the number of scars on the diagram, calculate the number of times the yeast cell could reproduce. [2]
  • Mark for working - Surface Area of Yeast Cell / Area of Scar - (4*3.14*1.52)/(3.14*0.52);
  • Mark for answer - 36;




d. Explain why the yeast cell might not be able to reproduce to its potential. [2]
  • Scars are circular;
  • So can not occupy total surface area/spaces between circular scars;
    or
  • Cell Cycle mainly in Interphase;
  • So yeast Cells may die before reproducing 36 times;




e. (QWC) Explain how cells are organised in a multicellular organism [5]
  • A tissue is a group of cells working together to perform a function;
  • Example of tissue/function;
  • An organ is a group of tissues working together to perform a function;
  • Example of organ/function;
  • An organ system is a group of organs working together to perform a life function;
  • Example of organ system/function;
  • AVP;
  • Use of 3 of the following words in correct context: tissue, organ, organ system, specialised...




3.
a. What is missing from the students table? [2]
  • Units of Measurement;
  • Used to calculate rate of bubble movement;
    or
  • Table of results;
  • Used to calculate mean rate.




b. Describe and explain the results on the table. [3]
  • As the number of leaves increase, the mean rate of bubble movement increases;
  • Use of figures from the table;
  • Increased number of stomata/surface area;
  • Increase in transpiration;




c. Explain why the students statement would effect the result and how he could improve the experiment. [6]
  • Different Size leaves result in difference number of stomata/larger surface area;
  • Use shoots with similar size leaves;
  • Wet leaves creates a humid microclimate/Reduces water potential gradient;
  • Wait for the leaves to dry;
  • Heat increases rate of evaporation/Light causes stomata to open;
  • Control the temperature/light intensity e.g. windowless room;




4.
a. Complete the gaps in the paragraph. [3]
  • Fluid Mosaic Model;
  • Active;
  • Lipids/Oxygen/Carbon Dioxide;
  • Carrier

b. Explain what the term cell signalling means. [1]
  • Cell Signalling is a process that leads to communication and coordination between cells;
  • Example of cell signalling;




c. (QWC) Explain the process of cell signalling. [4]
  • Glycoproteins/Glycolipids in plasma membrane;
  • Receptor;
  • Cell Signalling Molecule/Example e.g. hormones/enzymes;
  • Bind to receptor;
  • Which has a complimentary shape;
  • Use 3 of the following terms in correct context: Receptor, Glycolipid, Glycoprotein, Complimentary shape...




5.
a. Which organelles are present in a plant cell, animal cell and bacterial cell? [4]

Table































Cell Feature
Plant Cell
Animal Cell
Bacterial Cell
Chloroplast
Present
Absent
Absent
Cellulose Cell Wall
Present
Absent
Absent
Centrioles
Absent
Present
Absent
Ribosomes
Present
Present
Present

1 mark for each correct row.



b. Which test tubes contained the following organelles? [4]
  • Nuclei - 1;
  • Ribosomes - 4
  • Mitochondria - 2
  • Lysosomes - 2




c. Which organelle from above is the smallest? [1]
  • Ribosome;




6.
a. Explain the importance of lignin. [3]
  • Waterproofs xylem vessel wall/Stops water loss from Xylem wall;
  • Creates pits to allow water transport from Xylem vessel to other tissues;
  • Pattern in Lignin allows it to be flexible;
  • Supports the Xylem vessel/stops it from collapsing;




b. Explain the importance of cartilage. [3]
  • C - rings to allow movement of food in trachea
  • Gives support to the trachea;
  • Stops it from collapsing during inhalation;
  • Allows the neck to bend without damaging trachea;




c. Comment on the data about surface area and volume of the body/lungs. [3]
  • Small Surface Area:Volume ratio
  • Insufficient for bodys need;
  • Need a specialised exchange surface;
  • Such as alveoli;
  • Which has a large surface area for more gaseous exchange;


Please note, these are only some of a wide range of answer. If you're answer isn't on here, it could still be correct.

Hi

Did you get the mark scheme and paper

Please let me know

Thanks
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