CHEM AND BIO HELP AND TIPS HERE

[nid404]

http://www.medtropolis.com/VBody.asp  visit this site it's really good.

roughage/fibre cannot be digested.
fibre passes through the alimentary canal undigested.It thus finally reaches the large intestine and it absorbs large amounts of water on its way along the canal and the intestine, resulting in softer and bulkier stool .




The motor neurone sends impulses from the brain/spinal cord to the effectors whereas sensory neurones send impulses to the spinal cord/brain.

and ive attached a ppt. let me know if u need any help

[nid404]

hey aquarian93 hope info reaches u before the exam.

[nid404]

guys here's a site for ull to practice multiple choice questions for each topic.
http://www.fed.cuhk.edu.hk/~johnson/interactive_MC/eng_selection.html
and notes http://revisioncentre.co.uk/gcse/biology/index.html

tell me if u guys like it

[nid404]

guys, y don't ull post the questions here cuz there r so many topics i find it difficult to shuffle and i can really help ull with bio and chem.

So hope to see some questions when im back.

[Kim]

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
urgent help needed now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[....]

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
urgent help needed now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

are you sure the question is right? is it in any paper?

[Kim]

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
urgent help needed now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

are you sure the question is right? is it in any paper?

\
yup its in jun 99

[....]

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
urgent help needed now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

are you sure the question is right? is it in any paper?

\
yup its in jun 99

my june 99 got 20-30 missing..lool
well..apparently..the answer is y-chromosome..X-Y are neither genes, nor alleles..we consider them chromosomes..and in additon..every bod cell has XY chromosome..which means..it always has X and alwas has Y chromosome.

[Kim]

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
urgent help needed now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

are you sure the question is right? is it in any paper?

\
yup its in jun 99

my june 99 got 20-30 missing..lool
well..apparently..the answer is y-chromosome..X-Y are neither genes, nor alleles..we consider them chromosomes..and in additon..every bod cell has XY chromosome..which means..it always has X and alwas has Y chromosome.

haha weird!
thanks alot

[nid404]

hey Kim,
sorry for the delay but insanity-stricken has correctly said Y chromosome

Remember in females it's XX and males it's XY

so the sex is determined  by this

Only if the Y chromosome from the male combines with the females X chromosome will a boy be born
If X chromosomes from both combine it will be a girl

@ insanity-stricken: thanks for answerin it

[@d!_†oX!©]

I thought perhaps people will have many chem doubts just b4 the exam, so I made this thread...its better if we have all chem question in one thread rather that making new ones for each question.I start:

1)Design and draw an apparatus that could be used to collect the volume of hydrogen produced when zinc is added to dilute hydrochloric acid.
2)A solution gives a white ppt which is soluble in excess with sodium hydroxide. Its reaction with aq. ammonia gives a white ppt which is insoluble in excess. Find out the cation present in the solution.

okay, so i know how to design the experiment(as in the description) but i wanted a neat diagram plss.
nd for the second question, there can be 2 answers- Aluminum and Lead.....so which one should i write??

[Ghost Of Highbury]

the first one can be like this (attached)

the second one, umm, i guess it shud be aluminum because lead isnt dere in the book . which past paper is this?

[@d!_†oX!©]

Thanks for the diagram aadi...dts wt i wanted...
for the second, its from an o level past paper...actually i have a revision book from o levels...nd the question is from
"N2002 P3 A2a"
that is what is written, bt i tried o level nov 2002 p3..bt dts a practical...i dunno..
see if u know which paper it is nd let me know!!

[nid404]

Some1 could draw the stuff for you

For the second part.......Aluminium ions can be distinguished fromlead ions by the insolubility of lead chloride. So U add dil. HCl to the mixture  If colorless solution is formed it is aluminium ions. If a white ppt remains, then it's lead

[@d!_†oX!©]

but nid my practical paper is over...this question is from the structured paper(p3).....i can't do those reactions in the examination hall 
Thanks anyways...plss see if u cud help an better