Biology Paper 1 and 3 help HERE ONLY!!!

[nid404]

cud sum1 explain  the nitrifying denitrifying nitrogen fixing bacteria?
wat does the nucleus in every body cell of a male contain?
X allele
y allele
y chromosome
y gene

would sum1 please answer me?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Nitrifying bacteria converts the nitrogen in the air (in the soil) in to nitrate ions which is a source of protiens for plants.
Denitrifying bacteria converts these nitrate ions back into nitrogen and releases it in the air.

Y allele

hmmm..not right.....Nitrogen-fixing bacteria convert nitrogen in air to ammonium compounds and nitrifying bacteria convert ammonium compounds to nitrates and nitrites. Denitrifying bacteria converts the ions back to nitrogen.

It's Y chromosome

Allele is an alternative form of a gene. Chromosomes r responsible for the resulting gender. Males contain 1 X and 1Y chromosome and females have both X chromosomes

[VIP_93]

can somw1 plz send me jun-nov 1993 ques paper in bio
thx in advance

[Coco]

cud sum1 explain  the nitrifying denitrifying nitrogen fixing bacteria?
wat does the nucleus in every body cell of a male contain?
X allele
y allele
y chromosome
y gene

would sum1 please answer me?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Nitrifying bacteria converts the nitrogen in the air (in the soil) in to nitrate ions which is a source of protiens for plants.
Denitrifying bacteria converts these nitrate ions back into nitrogen and releases it in the air.

Y allele

hmmm..not right.....Nitrogen-fixing bacteria convert nitrogen in air to ammonium compounds and nitrifying bacteria convert ammonium compounds to nitrates and nitrites. Denitrifying bacteria converts the ions back to nitrogen.

It's Y chromosome

Allele is an alternative form of a gene. Chromosomes r responsible for the resulting gender. Males contain 1 X and 1Y chromosome and females have both X chromosomes

err What u said is exactly wa i said bou the nitrogen fixing bacteria......ammonium compounds or nitrate ions and ammonia contains nitrogen so OH WELL! ...... nitrigen ions are definitely correct and are specifically mentioned in ma IGCSE txt book and is ideal as it helps plants make protien required for growth by tha plant etc....

n ma bad for the Y allele sorry
Its the "Y" chromosome.

[sweetsh]

Ok here are some pictures I found useful for plants I'll attach more when I get them.
The first one is for the palaside cell.
The second one is a veryyyyyyy simple picture of the leaf structure which is easy to memorize!
Wait for more!

[Tako93]

I need p1 2001 2002

fast plz

[sweetsh]

Tako its not the proper place to place such a request...Anway, 2002 papers are up on FEP www.freeexampapers.com go check them. And 2001 i'll search for them for you

[Tako93]

well i thank you but i found 2002 and now i really need 2001 so plz help

[sweetsh]

It's rarely to find them on the internet will search

[Mastermind]

Can someone explain-> what is translocation?

[kam]

movement of sugars up to the leaves

[Mastermind]

movement of sugars up to the leaves

THANK YOU! always been confused with it

[kam]

movement of sugars up to the leaves

THANK YOU! always been confused with it

np

[simply.me]

what is a binomial system ?

[nid404]

Can someone explain-> what is translocation?

it's the process by which food substances are transferred from site of production(leaf) to sites of growth and storage by the phloem

[kam]

what is a binomial system ?

a name given to animals
where u have a genus, starting with a capital letter
and a species starting with an undercase letter

eg Panthera leo
Panthera genus
leo species