[ds4143]

(Original post by otrivine)
thanks
describe photophorylation (5)

Okay so Photophosphoylation starts of when light hits the chloroplast part of the cell. The light hits the chlorophyll and excited two electrons that are accepted by the electron acceptors. It is then passed along a chain of electron carriers, in doing so energy is released. This pumps protons across its thylakoid membrane in the space where they accumulate. Chemiosmosis happens as PRoton gradient forms, protons move down their gradient through ATPase enzymes. ATP is photophosphorylated from the energy. Water is split via hydrolysis forming 2electrons, 2H and 1/2 oxygen. ATP is then used in the light independent stage along with NADPH and co2 from the atmosphere, in the calvin cycle.

[otrivine]

(Original post by ds4143)
Okay so Photophosphoylation starts of when light hits the chloroplast part of the cell. The light hits the chlorophyll and excited two electrons that are accepted by the electron acceptors. It is then passed along a chain of electron carriers, in doing so energy is released. This pumps protons across its thylakoid membrane in the space where they accumulate. Chemiosmosis happens as PRoton gradient forms, protons move down their gradient through ATPase enzymes. ATP is photophosphorylated from the energy. Water is split via hydrolysis forming 2electrons, 2H and 1/2 oxygen. ATP is then used in the light independent stage along with NADPH and co2 from the atmosphere, in the calvin cycle.

PERFECT!!! only thing say NADP do not put the H as well

[natninja]

I didn't do this exam but a friend of mine did and noticed that one of the questions was copied word for word out of a paper from 2003 which would give some people an unfair advantage if they went back that far with past papers

[ds4143]

(Original post by natninja)
I didn't do this exam but a friend of mine did and noticed that one of the questions was copied word for word out of a paper from 2003 which would give some people an unfair advantage if they went back that far with past papers

That happened with the unit 5 bio exam we just had...the EXACT same question came up...mm I guess I need to get on to those legacy papers ^.^

[otrivine]

(Original post by ds4143)
That happened with the unit 5 bio exam we just had...the EXACT same question came up...mm I guess I need to get on to those legacy papers ^.^

ask me questions my turn

[ds4143]

(Original post by otrivine)
PERFECT!!! only thing say NADP do not put the H as well

THanks!! But isnt NADPH the same as reduced NADP?

Name the enzymes that breaks up acetylcholine and the products that are formed. (3)

[otrivine]

(Original post by ds4143)
THanks!! But isnt NADPH the same as reduced NADP?

Name the enzymes that breaks up acetylcholine and the products that are formed. (3)

hmm not sure to be honest i put reduced NADP?


the prdocuts are ethanoic acid and choline ? and is the enzyme acetlycholinesterase

[ds4143]

Ohhh okay well I do know NADPH is the same as reduced Well thats what my teacher said >=]

Boom 3/3 well done

[otrivine]

(Original post by ds4143)
Ohhh okay well I do know NADPH is the same as reduced Well thats what my teacher said >=]

Boom 3/3 well done

ok thats fine then i trust you !


Describe the role and structure of ATP(5)

[ds4143]

(Original post by otrivine)
ok thats fine then i trust you !


Describe the role and structure of ATP(5)

!

Role- to transport energy around to where it is needed in small amounts so that energy is not wasted. It is described as energy currency.

Structure- 3 phosphate groups, adenine group, and ribose

[otrivine]

(Original post by ds4143)
!

Role- to transport energy around to where it is needed in small amounts so that energy is not wasted. It is described as energy currency.

Structure- 3 phosphate groups, adenine group, and ribose

hhm is good but if the examiner was reallyyyyyy picky she/he would have given you 3/5 marks the structure you said is perfect but its the roles , firstly the energy currency would have gotten you the mark but you had to put universal key word and transport energy is not really the correct terminology to use just say easily releases Energy but well done u seem to know your stuffs well my turn

[ds4143]

(Original post by otrivine)
hhm is good but if the examiner was reallyyyyyy picky she/he would have given you 3/5 marks the structure you said is perfect but its the roles , firstly the energy currency would have gotten you the mark but you had to put universal key word and transport energy is not really the correct terminology to use just say easily releases Energy but well done u seem to know your stuffs well my turn

OH dang it! I knew something was wrong with just energy currency ahaha and okay so it releases energy easily >=] thanks

State the role of pyruvate dehydrogenase (1)

Suggest why living organisms has only a small amount of oxaloacetate in their cells. (1)

Why do enzymes have a particular name? (1) (This is an examiners tip question)

[otrivine]

(Original post by ds4143)
OH dang it! I knew something was wrong with just energy currency ahaha and okay so it releases energy easily >=] thanks

State the role of pyruvate dehydrogenase (1)

Suggest why living organisms has only a small amount of oxaloacetate in their cells. (1)

Why do enzymes have a particular name? (1) (This is an examiners tip question)

can i have from chapters 1 to photosythesis cause i only finsished photosytheiss till the first page just started to revise the last chapter today only knew that from past knowledge sorry

[sarahbellazir]

(Original post by natninja)
I didn't do this exam but a friend of mine did and noticed that one of the questions was copied word for word out of a paper from 2003 which would give some people an unfair advantage if they went back that far with past papers

That was F215


This was posted from The Student Room's iPhone/iPad App

[ds4143]

(Original post by otrivine)
can i have from chapters 1 to photosythesis cause i only finsished photosytheiss till the first page just started to revise the last chapter today only knew that from past knowledge sorry

ooh okay okay fine

Suggest why nephrons are convoluted (2)

Suggest why animals like beavers have a short loop of henle (1)

[otrivine]

(Original post by ds4143)
ooh okay okay fine

Suggest why nephrons are convoluted (2)

Suggest why animals like beavers have a short loop of henle (1)

for process of selective reabsoprtion to take place and to provide a larger surface area to volume ratio, thin walls, and for the ions/large molecules to diffuse or active transport or to move along the convoluted

because they require less water , less selective reabsoption and are adapted to their own environment , less hydration

[ds4143]

yay 3/3 very nicely done

[otrivine]

(Original post by ds4143)
yay 3/3 very nicely done

yayyyy

Outline how insulin level is controlled (5)

[ds4143]

(Original post by otrivine)
yayyyy

Outline how insulin level is controlled (5)

ahh okay

So the beta cell contains Ca and K ion channels. K ions are constantly moving out making theinside of the cell more negative - resting potential -70mV. As glucose con increases, glucose enters the cell. Glucose is rapidly respired product ATP. The increase in ATP causes K channels to close. K cannot move out causing depolaristion. This causes the Ca channels to open. As Ca enters, it causes vesicles containing insulin to fuse with the membrane. Its contents is removed by exocytosis.

[otrivine]

(Original post by ds4143)
ahh okay

So the beta cell contains Ca and K ion channels. K ions are constantly moving out making theinside of the cell more negative - resting potential -70mV. As glucose con increases, glucose enters the cell. Glucose is rapidly respired product ATP. The increase in ATP causes K channels to close. K cannot move out causing depolaristion. This causes the Ca channels to open. As Ca enters, it causes vesicles containing insulin to fuse with the membrane. Its contents is removed by exocytosis.

nice 5/5 marks
my turnnnnnnn