BIOLOGY unit 2 doubts here =]

[Simona]

EDEXCEL'S BIOLOGY unit 2 is on the 21st !!! just discuss questions or any stuff !!!
but for now ... can any1 tell me wot are the difference between anatomical - behavioral - physiological Adaptations ?

 

[U stalking ME]

anatomical - adaptations of the anatomy of plant/animal to conditions e.g thick blubber layer of seals
physiological-adaptations of the biochemistry/physiology of an organism to the enviorment in which it lives e.g mammalian diving response
behavioral - an adaptations of the behaviour of an animal which gives it selective advantage e.g. insect and reptiles orientate their bodies in such a way to get max. sunlight at low temp.

 

[Simona]

anatomical - adaptations of the anatomy of plant/animal to conditions e.g thick blubber layer of seals
physiological-adaptations of the biochemistry/physiology of an organism to the enviorment in which it lives e.g mammalian diving response
behavioral - an adaptations of the behaviour of an animal which gives it selective advantage e.g. insect and reptiles orientate their bodies in such a way to get max. sunlight at low temp.

BLESS YOU

 

[shamawi]

anatomical - adaptations of the anatomy of plant/animal to conditions e.g thick blubber layer of seals
physiological-adaptations of the biochemistry/physiology of an organism to the enviorment in which it lives e.g mammalian diving response
behavioral - an adaptations of the behaviour of an animal which gives it selective advantage e.g. insect and reptiles orientate their bodies in such a way to get max. sunlight at low temp.

i need the differences between parenchyma , sclarenchyma and colenchyma please ! can you ?

 

[U stalking ME]

i need the differences between parenchyma , sclarenchyma and colenchyma please ! can you ?

parenchyma are the unspecialised plant tissue that forms the packing tissue
sclerenchyma are the strenghening and supporting tissue found in plants, made up of heavily lignified, thick walled cells
colenchyma are the supporting tissue in plants
both sclerenchyma and colenchyma are specialised versions of parenchyma

 

[shamawi]

parenchyma are the unspecialised plant tissue that forms the packing tissue
sclerenchyma are the strenghening and supporting tissue found in plants, made up of heavily lignified, thick walled cells
colenchyma are the supporting tissue in plants
both sclerenchyma and colenchyma are specialised versions of parenchyma

THANK YOU !!

 

[U stalking ME]

difference b/w sclerenchyma and colenchyma;
sclerencyhma; 30 micro meters wide, long, living, lignified, has end walls and pits, dies-no longer grows, doesnt stretch as plant grows
colenchyma; 10 micro meters wide, long, dead, made of cellulose, has no end walls and no pits, remains living, stretches as plant grows

 

[U stalking ME]

THANK YOU !!

welcome

 

[shamawi]

what does pluripotent , multipotent and totipotent mean ? they are confusing =S

 

[U stalking ME]

pluripotent- are cells with the potential to form most of the cell types needed in an organism e.g Pluripotent stem cells can give rise to any fetal or adult cell type. However, alone they cannot develop into a fetal or adult organism because they lack the potential to contribute to extraembryonic tissue, such as the placenta.

totipotent - are cells with the potential to form all known cell types with in an organism e.g the zygote has the potential to form all of the known 216 cell types needed for an organism

multipotent- progenitor cells have the potential to give rise to cells from multiple, but a limited number of lineages. e.g. is a hematopoietic cell — a blood stem cell that can develop into several types of blood cells, but cannot develop into brain cells or other types of cells.

 

[Simona]

this is Question 2 in the January 2011 paper and it got me all confused !!!
it says :
Many drugs used in medicine are developed from plants. these drugs have to be tested before they are used.
(a) In 1775, William Withering published details of testing digitalis soup on patients with dropsy.
Compare this historic drug testing with contemporary drug testing protocols.
Give one similarity and two differences, other than the use of placebo, between these two protocols.

and i was like ... DAFUQ did i just read ???
can any1 tell me wot is this question is about ???

 

[U stalking ME]

this is Question 2 in the January 2011 paper and it got me all confused !!!
it says :
Many drugs used in medicine are developed from plants. these drugs have to be tested before they are used.
(a) In 1775, William Withering published details of testing digitalis soup on patients with dropsy.
Compare this historic drug testing with contemporary drug testing protocols.
Give one similarity and two differences, other than the use of placebo, between these two protocols.

and i was like ... DAFUQ did i just read ???
can any1 tell me wot is this question is about ???

they are telling u to compare William Withering trial and error method with modern days drug testing methods like the double blind study

 

[Vj Destiny]

this is Question 2 in the January 2011 paper and it got me all confused !!!
it says :
Many drugs used in medicine are developed from plants. these drugs have to be tested before they are used.
(a) In 1775, William Withering published details of testing digitalis soup on patients with dropsy.
Compare this historic drug testing with contemporary drug testing protocols.
Give one similarity and two differences, other than the use of placebo, between these two protocols.

and i was like ... DAFUQ did i just read ???
can any1 tell me wot is this question is about ???

you have to tell 1 similarity and 2 differencex btw da William Withering's drug testing method n todays method
similarity cud b its tested on humanx..differencex r its tested on animalx before etc

 

[shamawi]

pluripotent- are cells with the potential to form most of the cell types needed in an organism e.g Pluripotent stem cells can give rise to any fetal or adult cell type. However, alone they cannot develop into a fetal or adult organism because they lack the potential to contribute to extraembryonic tissue, such as the placenta.

totipotent - are cells with the potential to form all known cell types with in an organism e.g the zygote has the potential to form all of the known 216 cell types needed for an organism

multipotent- progenitor cells have the potential to give rise to cells from multiple, but a limited number of lineages. e.g. is a hematopoietic cell — a blood stem cell that can develop into several types of blood cells, but cannot develop into brain cells or other types of cells.

you are a legend ! thanks again

 

[U stalking ME]

you are a legend ! thanks again

lol ur welcome

 

[z3r0thunder]

Here is the Specification for Unit 2 and some Revision Notes:
http://brain-freeze.co.uk/files/Edexcel Unit 2 Specification.pdf
http://brain-freeze.co.uk/files/Edexcel Unit 2 Revision Notes.pdf

 

[Simona]

they are telling u to compare William Withering trial and error method with modern days drug testing methods like the double blind study

and wot should i answer ???

 

[U stalking ME]

and wot should i answer ???

see this http://www.scribd.com/dinesha_liyan...ting-With-Contemporary-Drug-Testing-Protocols

 

[Simona]

see this http://www.scribd.com/dinesha_liyan...ting-With-Contemporary-Drug-Testing-Protocols

YOU ARE AN ANGEL <3

 

[daredevil]

this is Question 2 in the January 2011 paper and it got me all confused !!!
it says :
Many drugs used in medicine are developed from plants. these drugs have to be tested before they are used.
(a) In 1775, William Withering published details of testing digitalis soup on patients with dropsy.
Compare this historic drug testing with contemporary drug testing protocols.
Give one similarity and two differences, other than the use of placebo, between these two protocols.

and i was like ... DAFUQ did i just read ???
can any1 tell me wot is this question is about ???

are u guys talking about o levels biology (5090) here? bcuz all of this stuff seems irrelevant please tell me *getting scared* :/