Qualification > Sciences
Biology Paper 1 and 3 help HERE ONLY!!!
nid404:
--- Quote from: Coco on June 04, 2009, 04:50:11 pm ---
--- Quote from: kim on June 04, 2009, 03:19:14 pm ---
--- Quote from: kim on June 04, 2009, 03:11:41 pm ---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
--- End quote ---
would sum1 please answer me?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! >:(
--- End quote ---
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
--- End quote ---
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:
--- Quote from: nid404 on June 04, 2009, 04:55:08 pm ---
--- Quote from: Coco on June 04, 2009, 04:50:11 pm ---
--- Quote from: kim on June 04, 2009, 03:19:14 pm ---
--- Quote from: kim on June 04, 2009, 03:11:41 pm ---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
--- End quote ---
would sum1 please answer me?!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! >:(
--- End quote ---
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
--- End quote ---
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
--- End quote ---
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
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