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YWArtist
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#1941
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#1941
Hi does anyone know if the actual paper is synoptic or just the essay?
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JenLivYoung
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#1942
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#1942
(Original post by YWArtist)
Hi does anyone know if the actual paper is synoptic or just the essay?
There's a question that is also synoptic, but the majority of the paper isn't
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SamEastie
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#1943
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#1943
can someone please explain when totipotent, pluripotent and multipotent cells occur, in a human for example. I know totipotent is like.. embryonic stem cells but not the other 2..
thanks
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neelam123h
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#1944
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#1944
Can someone please explain restriction mapping to me please. Thanks
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safis
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#1945
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#1945
Any predictions on titles for the essay questions?
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Starlight94
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#1946
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#1946
Done the unit 4 exam today, unit 5 all the way now, scared is an understatement
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mathsguy
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#1947
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#1947
(Original post by safis)
Any predictions on titles for the essay questions?
I think there'll be an essay on controls, practical investigations and statistical tests

Also something to do with proteins

Negged for this comment... Really...
There are 12 possible categories that can be assessed on essays and practical controls and statistical tests are one of the essay categories.
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F1's Finest
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#1948
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#1948
(Original post by guitardad)
Thank you!

(I'm gonna have to rep you tomorrow I've run out of rep! )
Why did you neg my earlier post?
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YWArtist
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#1949
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#1949
What are IPSPs and EPSPs /:
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YWArtist
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#1950
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#1950
Do we need to know about endopeptidase and exopeptidase?
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JoshL123
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#1951
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#1951
(Original post by SamEastie)
can someone please explain when totipotent, pluripotent and multipotent cells occur, in a human for example. I know totipotent is like.. embryonic stem cells but not the other 2..
thanks
Totipotent stem cells refers to stem cells that have to ability to differentiate into all cells of a given organism. Totipotent stem cells are predominantly present in the embryos but I think can also be found within the bone marrow (correct me if I am wrong). In plants totipotent stem cells are found in almost all locations (from the root to the shoot). A pluripotent stem cell refers to a stem cell that has the ability to differentiate into almost every type of cell of a given organism, and finally, a multipotent stem cell has the capability to differentiate into the fewest possible range of cells
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starfish232
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#1952
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#1952
Hi, could someone please just help me with some questions I have about muscle contraction:

1. Is the sliding filament theory to do with describing the process of muscle contraction or is to do with changes in the sarcomere when muscle contraction happens?
2. In Q2b of the June 2012 paper, the answer is between 29545-30455 but I got an answer of 25909 and I'm not exactly sure what the image measurement is suppose to be.
I got 114(mm) x 1000 / 4.4 which equaled to about 25909.

Thanks
http://filestore.aqa.org.uk/subjects...W-MS-JUN12.PDF
http://filestore.aqa.org.uk/subjects...5-QP-JUN12.PDF
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propagation
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#1953
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#1953
Hi can someone answer this question please:

If I was to retake a exam and got a worse grade the 2nd time round e.g. I get a C first time then 2nd time get a D. Would my A-level grade remain as a C for that unit or will it become a D???? Thanks?
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propagation
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#1954
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(Original post by YWArtist)
Do we need to know about endopeptidase and exopeptidase?
Don't think so, but should be ok for the Essay if related for Extra spec
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SamEastie
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#1955
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#1955
(Original post by JoshL123)
Totipotent stem cells refers to stem cells that have to ability to differentiate into all cells of a given organism. Totipotent stem cells are predominantly present in the embryos but I think can also be found within the bone marrow (correct me if I am wrong). In plants totipotent stem cells are found in almost all locations (from the root to the shoot). A pluripotent stem cell refers to a stem cell that has the ability to differentiate into almost every type of cell of a given organism, and finally, a multipotent stem cell has the capability to differentiate into the fewest possible range of cells
thanks! i'd assume, based on your definition, multipotent must be in bone marrow? because bone marrow ones only go to blood cells? i think..
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DavidYorkshireFTW
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#1956
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#1956
(Original post by SamEastie)
thanks! i'd assume, based on your definition, multipotent must be in bone marrow? because bone marrow ones only go to blood cells? i think..
Yep
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samfreak
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#1957
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#1957
(Original post by a level student1)
with regards to DNA sequencing and gel electrophoresis on page 268 it says "In this way the whole sequence of bases on the terminator nucleotides was found to be AGCTTGAC and this is the sequence on one of the strands of the newly formed DNA." i thought that it was the sequence of the DNA we we originally had that we were trying to find though and not the sequence of the terminator nucleotides. Therefore the sequence we would be trying to find would be the opposite bases to the terminator nucleotide sequence?
yh im stuck on this aswell :-( can someone please help us?

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soundsfishy
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#1958
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#1958
(Original post by propagation)
Hi can someone answer this question please:

If I was to retake a exam and got a worse grade the 2nd time round e.g. I get a C first time then 2nd time get a D. Would my A-level grade remain as a C for that unit or will it become a D???? Thanks?
They take your highest mark at the end, don't worry.
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EmilyBoorman
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#1959
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#1959
Thought this might be helpful... Possible essay titles,
 The different ways in which organisms use ATP
 How the structure of cells is related to their function
 How the structure of cell organelles is related to their functions
 Write an essay about mitochondria.
 The roles of membranes in living organisms
 The biological importance of water
 The roles of enzymes in the control of metabolic pathways
 The structure and functions of carbohydrates
 How the structure of proteins is related to their functions
 The functions of nucleic acids.
 Polymers have different structures. They also have different functions.
Describe how the structures of different polymers are related to their
functions.
 Importance of Molecular shape
 Condensation and hydrolysis and their importance in biology.
 The importance of hydrogen bonds in living organisms
 Inorganic ions include those of sodium, phosphorus and hydrogen. Describe
how these and other inorganic ions are used in living organisms.
 The process of osmosis and its importance to living organisms
 The process of diffusion and its importance in living organisms.
 How bacteria affect human lives
 The many causes of human disease.
 The ways in which different species of organisms differ from each other
 Why offspring produced by the same parents are different in appearance.
 The factors which determine an organism’s phenotype.
 The movement of substances within living organisms
 Relationships between animals and plants
 Energy transfers which take place inside living organisms
 Energy is transferred to, within and from living organisms via light,
heat, movement, electricity and chemical changes. Describe the ways
in which energy can be transferred within living organisms.
 The transfer of energy between different organisms and between
these organisms and their environment
 Heat and many different substances are transferred within the body
and between the body and the environment. Explain how surface area
is linked to this transfer.
 Describe how nitrogen-containing substances are taken into, and
metabolised in, animals and plants.
 Explain how the cycling of carbon and nitrogen in ecosystems is
influenced by human activity.
 Negative feedback and its importance in biology.
 Maintaining constant conditions in the body.
 How an amino acid gets from protein in a person’s food to becoming
part of a human protein in that person.12
 How carbon dioxide gets from a respiring cell to the lumen of an
alveolus in the lungs.
 Discuss the ways in which terrestrial organisms achieve efficient gas
exchange while at the same time limiting water loss.
 The different ways in which living organisms obtain their nutrients.
 Write an essay about receptor molecules and their importance in
biology.
 The roles of pigments in living organisms

Source - http://lostling.files.wordpress.com/...essay-pack.pdf
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matthew_skeet27
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#1960
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#1960
Anyone have any ideas as to how much time we're expected to spend on the essay?
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