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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 353737 times)

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1530 on: May 23, 2010, 09:21:46 am »
Quote from: princess12 on May 23, 2010, 09:20:42 am
can any 1 tell me tips for paper 1 in chemistry

Past papers!! Lots of them! :D
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Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1531 on: May 23, 2010, 09:23:52 am »
Many bacterial diseases can no longer be treated with antibiotics. Outline how
antibiotic-resistant strains of bacteria can develop. ??? ??? Why cant they.

Antibiotics can kill  bacteria without harming living cells, so whats makes
it hard for antibiotics to kill bacteria, if someone can give a further explanation. :-\
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1532 on: May 23, 2010, 09:24:26 am »
Quote from: Raywin on May 23, 2010, 09:21:46 am
Past papers!! Lots of them! :D


ya do as much past papers as u can ;) ..........i hope u kill the paper  8)
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Offline princess12

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1533 on: May 23, 2010, 09:26:45 am »
thanx
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1534 on: May 23, 2010, 09:30:35 am »
Quote from: Helium on May 23, 2010, 09:23:52 am
Many bacterial diseases can no longer be treated with antibiotics. Outline how
antibiotic-resistant strains of bacteria can develop. ??? ??? Why cant they.

Antibiotics can kill  bacteria without harming living cells, so whats makes
it hard for antibiotics to kill bacteria, if someone can give a further explanation. :-\

Well, antibiotics are selective. They are meant to destroy a specific bacteria. If a mutation happens to some of these bacteria, then the antibiotic will destroy ONLY the bacteria that did not get mutated. And the bacteria that got mutated will reproduce and the antibiotic will no longer be effective.. :) I think thare is more to it but hope this helps.. :D  
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1535 on: May 23, 2010, 09:35:07 am »
i have a q...c sumtimes they give a microscopic veiw of a leaf and tell us to i dentify phloem and xylem...how do we no which one is which...i remember my teacher sayin sumthin abt it relating to color and size....can ane one explain..Thanks :D
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Offline dodi23

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1536 on: May 23, 2010, 09:42:06 am »
xylems always on the inside :)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1537 on: May 23, 2010, 09:50:16 am »
Quote from: aangel42 on May 23, 2010, 09:40:03 am
What topics do we think will come on Bio Paper 3 tomorrow?
I guess genetic engineering won't come since it came in O/N last year, and teeth can't come, since we had SO MUCH of that in P6 (variant 2, at least). Penicillin came in P6 too... so what else is left for Paper 3? Any ideas?

Reproduction - both in plants and animal (BIG chap)
Environment n stuff .. definitions of ecosystems population
Genetic variation .. mitosis and meiosis
Transport in animals and plants ..
Enzymes
wat else ?? .. i'll tell if i can think of any ..
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1538 on: May 23, 2010, 09:56:38 am »
Quote from: guMnam on May 23, 2010, 09:35:07 am
i have a q...c sumtimes they give a microscopic veiw of a leaf and tell us to i dentify phloem and xylem...how do we no which one is which...i remember my teacher sayin sumthin abt it relating to color and size....can ane one explain..Thanks :D

u want other labels too ??
« Last Edit: May 23, 2010, 10:38:42 am by ~VIN1094~ »
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1539 on: May 23, 2010, 10:09:15 am »
Hey guys, i got two questions:

1) Outline the use of microorganisms and
fermenters to manufacture the antibiotic
penicillin

2) The role of the fungus Penicillium in
the production of antibiotic penicillin.  

:S its in the syllabus and im clueless abt them!! Thx!!  ;D
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1540 on: May 23, 2010, 10:12:32 am »
Quote from: Raywin on May 23, 2010, 10:09:15 am
Hey guys, i got two questions:

1) Outline the use of microorganisms and
fermenters to manufacture the antibiotic
penicillin

2) The role of the fungus Penicillium in
the production of antibiotic penicillin.  

:S its in the syllabus and im clueless abt them!! Thx!!  ;D

search in this topic .. this has been discussed earlier ..
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1541 on: May 23, 2010, 10:13:22 am »
Quote from: ~VIN1094~ on May 23, 2010, 10:12:32 am
search in this topic .. this has been discussed earlier ..

Ohh k.. my bad.. :P
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Offline NidZ- Hero

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1542 on: May 23, 2010, 10:25:51 am »
hey can1 explain wats a negative feedback
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Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1543 on: May 23, 2010, 10:27:33 am »
Quote from: dodi23 on May 23, 2010, 09:42:06 am
xylems always on the inside :)

Xylem is always on the inside when it's a transverse section of a root or stem,
But i think when it comes to the microscopic view of a leaf it's different

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Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1544 on: May 23, 2010, 10:28:49 am »
Looks like ~VIN1094~ did his job ;D already
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