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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 357030 times)

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3120 on: June 07, 2010, 05:08:12 pm »
Quote from: aangel42 on June 07, 2010, 05:06:43 pm
that sounded pretty experienced to me... lol
anyone think we'll get as hard a question as this tomorrow???
what is agar jelly specifically? how does foil prevent it? how does the jelly allow it?

I have the same Qs.. :D all i noe is tht agar jelly solidifies.. :/ but im not sure how it implys to this Q.
And i doubt well get this hard Qs tomoz, but hey who wants to take the risks? ;)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3121 on: June 07, 2010, 05:10:05 pm »
Quote from: weaam on June 07, 2010, 04:31:08 pm
*Ehem*Ehem* Please  ::)

REALLY SORRY FOR THE DELAY I was having my dinner... :-[

29) Difficult to explain .. tried my best..Drawing a punett square would make life easier.. Q. says n.blindness is caused by a dominant allele. If we take them to be N-dominant and n-recessive

then..attached

35) Decomposers always produce CO2 and H2O while decomposing and NOT N2

37) B,
opt. A belongs to only to water cycle
opt. C is neither
opt.D is again water cycle



EDIT:: Image slightly modified.
« Last Edit: June 07, 2010, 05:25:05 pm by ~VIN1094~ »
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3122 on: June 07, 2010, 05:10:43 pm »
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Offline Airhead

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3123 on: June 07, 2010, 05:11:10 pm »
Quote from: aangel42 on June 07, 2010, 05:06:43 pm
that sounded pretty experienced to me... lol
anyone think we'll get as hard a question as this tomorrow???
what is agar jelly specifically? how does foil prevent it? how does the jelly allow it?

Haha, thanks :)

I just know that agar jelly is used to grow plants artificially in laboratories, so it can absorb chemical substances. That's how it allows the auxin to pass through. Foil is pretty much impermeable, so I assume it wouldn't let auxin get through.

You could check this out if you want a more detailed description though:
http://en.wikipedia.org/wiki/Agar
« Last Edit: June 07, 2010, 05:13:06 pm by Airhead »
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3124 on: June 07, 2010, 05:17:39 pm »
Quote from: Airhead on June 07, 2010, 05:11:10 pm
Haha, thanks :)

I just know that agar jelly is used to grow plants artificially in laboratories, so it can absorb chemical substances. That's how it allows the auxin to pass through. Foil is pretty much impermeable, so I assume it wouldn't let auxin get through.

You could check this out if you want a more detailed description though:
http://en.wikipedia.org/wiki/Agar

Thx ;) +rep
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Offline Moonlyte

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3125 on: June 07, 2010, 05:19:54 pm »
Hi! Could someone please explain to me number 14 of june 2008?

Here's the link:

http://www.freeexampapers.us/IGCSE/Biology/CIE/2008%20Jun/0610_s08_qp_1.pdf

The answer is B
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3126 on: June 07, 2010, 05:22:51 pm »
Quote from: Moonlyte on June 07, 2010, 05:19:54 pm
Hi! Could someone please explain to me number 14 of june 2008?

Here's the link:

http://www.freeexampapers.us/IGCSE/Biology/CIE/2008%20Jun/0610_s08_qp_1.pdf

The answer is B

Its B. For the blood (transport of o2) iron is needed. So just look in the graph of Fe and choose the food with the highest content of iron, eggs!! :)
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Offline SNA

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3127 on: June 07, 2010, 05:25:07 pm »
Quote from: Moonlyte on June 07, 2010, 05:19:54 pm
Hi! Could someone please explain to me number 14 of june 2008?

Here's the link:

http://www.freeexampapers.us/IGCSE/Biology/CIE/2008%20Jun/0610_s08_qp_1.pdf

The answer is B
its because iron is needed to make haemoglobin which is needed to transport oxygen.
since egg is the richest in iron, its the most suitable answer! :D
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Offline Weaam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3128 on: June 07, 2010, 05:27:05 pm »
Quote from: ~VIN1094~ on June 07, 2010, 05:10:05 pm
REALLY SORRY FOR THE DELAY I was having my dinner... :-[

29) Difficult to explain .. tried my best..Drawing a punett square would make life easier.. Q. says n.blindness is caused by a dominant allel. If we take them to be N-dominant and n-recessive

then..attached

35) Decomposers always produce CO2 and H2O while decomposing and NOT N2

37) B,
opt. A belongs to only to water cycle
opt. C is neither
opt.D is again water cycle



Thank you, thank you, thank you, dude you are AWESOME!  :-*
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Offline Moonlyte

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3129 on: June 07, 2010, 05:28:09 pm »
Thanks Raywin and SNA!!
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3130 on: June 07, 2010, 05:29:09 pm »
Quote from: Moonlyte on June 07, 2010, 05:28:09 pm
Thanks Raywin and SNA!!

Anytime.. :) glad to help. ;D
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3131 on: June 07, 2010, 05:33:17 pm »
Quote from: weaam on June 07, 2010, 05:27:05 pm
Thank you, thank you, thank you, dude you are AWESOME!  :-*

Ha ha glad you got it :)
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3132 on: June 07, 2010, 05:52:01 pm »
Quote from: aangel42 on June 07, 2010, 05:50:50 pm
If a question asks you for the best measurement to determine growth, is it dry mass? Even though you'd have to kill the organism?

(Or, this just occurred to me, does it depend on whether the organism in question is a human or a plant?)

Its dry mass. :)
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Offline 8T

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3133 on: June 07, 2010, 05:57:25 pm »
Could someone someone temme which is the correct answer please , it has always confused me??
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #3134 on: June 07, 2010, 05:57:49 pm »
Quote from: aangel42 on June 07, 2010, 05:54:38 pm
What are the common enzymes tested on Paper 1 and the pH's of each...?

If anyone can suggest a couple names????

Thanks in advance :)

Amylase (salivary and pancreatic) both neutral = starch to maltose
Maltase (from pancreas) alkaline = maltose to glucose
Lipase (from pancreas) alkaline = lipids(fats) to fatty acids and glycerol
Protease (in stomach) acidic = proteins to amino acids

Im sure u need to know all these. :)
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