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F215 - Revision thread 13th June 2011

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Reply 1360
Avatar for Dunn0
Dunn0
1
O my didays....
Do we need to remember all the shiz on corticotropin releasin factor(CRF) and adreno-corticotropic hormone(ACTH)????
Original post by Suren_x
Yeah I managed to revise most of it and reviewed Humans and Galapagos and then crashed hard because I started hallucinating lol :eek:


I've heard a lot of people say they think Galapagos will come up :yep:
Ahh that's scary! :eek: :tongue:
Reply 1362
Avatar for YuDunno
YuDunno
1
Original post by mariam8
can someone please explain the sliding filament model? I really don't understand it... Thanks :smile:




MYOSIN PROTEIN (thick filament)
ACTIN PROTEIN (thin filament)
Z lines

H Zone is the part that has only MYOSIN
I Band is the part that has only ACTIN
A Band is the length of the MYOSIN also contains overlapping ACTIN

When the muscle contracts, the H zone decreases, and the I band decreases but the A band stays the same length..requires ATP which is hydrolysed to ADP + Pi
(edited 12 years ago)
sliding filament model.png1.8KB
focus on Module 1 content...hardly any of it appeared in Jan11...
there was this question that question that i came across.
outline the difference between DNA and Protein

can anybody help me out on this question?
(edited 12 years ago)
Im soooo friggin scared for this exam...i feel like im startin 2 forget things!!! sooo stressful!
Original post by greenford
there was this question that question that i came across.
outline the difference between DNA and Protein

can anybody help me out on this question?


DNA is made out of monomers of nucleotides
Protein is made out of monomers of amino acids

DNA consists of two polynucleotide strands
Protein consists of a primary structure, which can coil and fold in any way

DNA has hydrogen bonds between the bases
Protein has peptide bonds between amino acids

DNA is in the nucleus off the cell
Proteins are found outside the cell generally, e.g outside ribosomes, packaged at vesicles.
Original post by YuDunno
MYOSIN PROTEIN (thick filament)
ACTIN PROTEIN (thin filament)
Z lines

H Zone is the part that has only MYOSIN
I Band is the part that has only MYOSIN
A Band is the length of the MYOSIN

When the muscle contracts, the H zone decreases, and the I band decreases but the A band stays the same length..requires ATP which is hydrolysed to ADP + Pi


I band is only actin
A band is the length of the myosin, but it also contains overlapping actin fillament :smile:
Reply 1368
Avatar for YuDunno
YuDunno
1
Original post by Waqar Y
I band is only actin
A band is the length of the myosin, but it also contains overlapping actin fillament :smile:



SORRRY!!

Thank youu :smile:
Reply 1369
Avatar for Dunn0
Dunn0
1
O my didays....
Do we need to remember all the shiz on corticotropin releasin factor(CRF) and adreno-corticotropic hormone(ACTH)????
Original post by heartskippedabeat
a long ethics question on the lac operon? :eek:


No, on gene therapy, genetic screening, xenotransplanation or somethinh. Don't stress! :smile:
Original post by greenford
so..what kind of grades do people need to got to get onto their course ?


I only need a C in Biology to get into mine :biggrin:
Although the way f214 went and the way revision's going for this module... :s-smilie:
I'm aiming for a B though. How about you?
Original post by Dunn0
O my didays....
Do we need to remember all the shiz on corticotropin releasin factor(CRF) and adreno-corticotropic hormone(ACTH)????


No, for the fight or flight response you'd need to probably know.

- The sensory input comes in the form of audio/visual stimuli which alert the hypothalamus

- The hypothalamus responds, by further activating the sympathethic nervous system > which is able to release the neurotransmitter Noradrenaline > which can travel in the blood and bind to specific target receptors on the adrenal medulla

- The adrenal medulla secretes Adrenaline, effects include: Increased heart rate, increased ventillation rate, increase in blood volume to skeletal muscle, increase in mental awareness, due to dillation of pupils. Decrease in peristasis(digestion) so more blood flow avaliable to skeletal muscle. Release of endophorins which are natural pain killers..etcetcetc
Original post by YuDunno
SORRRY!!

Thank youu :smile:


t'is cool, hows revision for this going?
Original post by science rules! :)
No, on gene therapy, genetic screening, xenotransplanation or somethinh. Don't stress! :smile:


Haha yeah I didn't think it would be possible to ask us one but someone said they thought it would come up :tongue:
Can someone explain to me the difference between species richness and species evenness? :holmes:
Original post by Kidms001
Can someone explain to me the difference between species richness and species evenness? :holmes:


I think:

Species richness - the amount of species in a specific habitat

Species eveness - the relative abundance of each species in a specific habitat, e.g 40 dogs 5 cats would be a low species eveness
Reply 1377
Avatar for YuDunno
YuDunno
1
Original post by Waqar Y
t'is cool, hows revision for this going?


It was going okay, till about 4minutes ago...I stumbled across the thread about Sarfaraz Shah being shot dead by police officers.. and the video has made me feel so shocked/sick I'm put off revision. Some people are so heartless it makes me really sad :frown:

I hope it's going well for you?

Conservation Vs Preservation?
Reply 1378
Avatar for YuDunno
YuDunno
1
Original post by heartskippedabeat
Aww I'm sure you'll have got anA this time round :biggrin:
Can I be cheeky and ask what topics she's predicted? :tongue: My teachers have been pretty useless haha :redface:
You too!!



Meiosis and Variation
- diagrams of the stages
-hardy weinberg
-variation

Biotechnology
-growth curves
-immobilised enzymes

Genomes
-golden rice
-gene therapy
-ethical concerns

Ecosystems
-succession

Population and sustainability
-predator/prey
-conservation

Plant responses
-Auxin - light and apical dominance

Animal response
-sliding filament model

Behaviour
-innate behaviour

This is what he has predicted based on the papers so far..
Original post by YuDunno
Meiosis and Variation
- diagrams of the stages
-hardy weinberg
-variation

Biotechnology
-growth curves
-immobilised enzymes

Genomes
-golden rice
-gene therapy
-ethical concerns

Ecosystems
-succession

Population and sustainability
-predator/prey
-conservation

Plant responses
-Auxin - light and apical dominance

Animal response
-sliding filament model

Behaviour
-innate behaviour

This is what he has predicted based on the papers so far..


Module 1 is quite big as is Module 2...so we can expect q uite a few questions

But Module 3 and 4 are much shorter and it is quite easy to see which topics have and have not been examined yet :smile:

Would'nt you expect Sequencing PCR to come up? There was a 9 mark question on DNA replication?:confused: in F212 hmm

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