A level Biology: Post your doubts here!

[gary221]

What book do u hav for bio

The coursebook by Jones, Fosberry, Gregory n Taylor

 

[A star]

heyy can anyone give me any notes or any other kind of guidance on plasma membrane .... esp the movement topics in it like facilitated diffusion, ATP wala transport, osmotic pressure and that stuf?? A star and syed1995

sorry daredevil but both of us dont have bio

 

[daredevil]

sorry daredevil but both of us dont have bio

oooh darn it -_- i really need help with this stuff :/ no problem

 

[A star]

oooh darn it -_- i really need help with this stuff :/ no problem

no problem there must be others who can help

 

[Amy Bloom]

daredevil : these might help you
They are simple, concise and easy to understand. If you have doubts or need more explanation, PM or tag me somewhere.
Plasma membrane: http://www.s-cool.co.uk/a-level/biology/cells-and-organelles/revise-it/the-cell-membrane
Movement of substances: http://www.s-cool.co.uk/a-level/biology/cells-and-organelles/revise-it/movement (they are interactive, just click on "play")

 

[megamind]

ive got some question in bio

why is need for hydrogen removal and its acceptance by NAD

why is need for supplies of NAD to allow glycolysis to proceed

someone please anwser

 

[megamind]

ive got another question

explain the importance of base pairing pleeasee?

 

[Amy Bloom]

ive got some question in bio

why is need for hydrogen removal and its acceptance by NAD

why is need for supplies of NAD to allow glycolysis to proceed

someone please anwser

NAD is simply a carrier of H+ so that the Electron Transfer chain occurs and finally generate ATP
The hydrogen must be removed from each of the Triose Phosphate molecules to form pyruvate acid molecules. Now, where will these hydrogen molecules go? they are just passed to NAD (which are reduced). The reduced NAD has another importance later in the process.
I hope that i cleared ur doubt.

 

[Amy Bloom]

ive got another question

explain the importance of base pairing pleeasee?

Base pairing, i'm referring to correct base pairing, is important as the DNA codes for specific amino acids, which make up the important proteins in the body. A mismatched base pair, which can be caused by a mutation for e.g., can result into coding of an incorrect amino acid (s), eventually the protein structure and function may be altered.

 

[syed1995]

heyy can anyone give me any notes or any other kind of guidance on plasma membrane .... esp the movement topics in it like facilitated diffusion, ATP wala transport, osmotic pressure and that stuf?? A star and syed1995

Dude I don't have Bio

 

[megamind]

thanks Amy Bloom
but i want to put an argument for the case of importance of base pairing

cant we say that base pairing keeps the bases inside so that it is less likely to damage from outside,and hydrogen bondind of base pairs stablilzes DNA

take no offense from the argument, i just want a constructive argument

 

[Thampi4]

Tha

The coursebook by Jones, Fosberry, Gregory n Taylor[/quotThanks

Thanks

 

[Thampi4]

What about NAD being a co enzyme so if base pairing is wrong due to mutation then an incorrect co enzyme is synthesized in protein synthesis so NAD won't be a good hydrogen carrier hence respiration cant take place.

 

[Thampi4]

thanks Amy Bloom
but i want to put an argument for the case of importance of base pairing

cant we say that base pairing keeps the bases inside so that it is less likely to damage from outside,and hydrogen bondind of base pairs stablilzes DNA

take no offense from the argument, i just want a constructive argument

What about NAD being a co enzyme so if base pairing is wrong due to mutation then an incorrect co enzyme is synthesized in protein synthesis so NAD won't be a good hydrogen carrier hence respiration cant take place.

 

[HorsePower]

What about NAD being a co enzyme so if base pairing is wrong due to mutation then an incorrect co enzyme is synthesized in protein synthesis so NAD won't be a good hydrogen carrier hence respiration cant take place.

that can be another way of looking at it...

 

[HorsePower]

but faulty DNA will lead to all enzymes being faulty

 

[Thampi4]

but faulty DNA will lead to all enzymes being faulty

It depends if the mutation is base substitution the there is a chance that the triplet code is for same amino acid

If its base addition or deletion the more fatal

 

[HorsePower]

exactly

 

[Amy Bloom]

thanks Amy Bloom
but i want to put an argument for the case of importance of base pairing

cant we say that base pairing keeps the bases inside so that it is less likely to damage from outside,and hydrogen bondind of base pairs stablilzes DNA

take no offense from the argument, i just want a constructive argument

U know, the fact that Hydrogen bonding is known to be strong, i don't think that by keeping bases inside would 'protect' the latter, i don't think its a strong argument here. However, what i have said previously, is an answer accepted by examiners. try to see other people's opinions about what you have said.

 

[cyclone94]

salamz,
sm can plz help wid crop improvement (hybridisation)..lyk juz gv a few points on this topic....