Author Topic: Edexcel BIOLOGY Doubts!!!!  (Read 132371 times)

Offline Romeesa-Chan

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #540 on: September 16, 2011, 09:38:36 pm »
You can post your Edexcel Biology doubts here instead of making new thread on it:
https://studentforums.biz/sciences-149/edexcel-biology-doubts!!!!/

Answer:

If it is morally wrong to cause animals to suffer then experimenting on animals produces serious moral problems.

Animal experimenters are very aware of this ethical problem and acknowledge that experiments should be made as humane as possible.

They also agree that it's wrong to use animals if alternative testing methods would produce equally valid results.

Two positions on animal experiments

In favour of animal experiments:
Experimenting on animals is acceptable if (and only if):
-suffering is minimised in all experiments
-human benefits are gained which could not be obtained by using other methods

Against animal experiments:
Experimenting on animals is always unacceptable because:
-it causes suffering to animals
-the benefits to human beings are not proven
-any benefits to human beings that animal testing does provide could be produced in other ways

Harm versus benefit

The case for animal experiments is that they will produce such great benefits for humanity that it is morally acceptable to harm a few animals.

The equivalent case against is that the level of suffering and the number of animals involved are both so high that the benefits to humanity don't provide moral justification.

~ The three Rs

The three Rs are a set of principles that scientists are encouraged to follow in order to reduce the impact of research on animals.

The three Rs are: Reduction, Refinement, Replacement.

Reduction:
Reducing the number of animals used in experiments by:
-Improving experimental techniques
-Improving techniques of data analysis
-Sharing information with other researchers

Refinement:
Refining the experiment or the way the animals are cared for so as to reduce their suffering by:
-Using less invasive techniques
-Better medical care
-Better living conditions

Replacement:
Replacing experiments on animals with alternative techniques such as:
-Experimenting on cell cultures instead of whole animals
-Using computer models
-Studying human volunteers
-Using epidemiological studies
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #541 on: September 16, 2011, 10:25:53 pm »
Anyone??

Q1: A homeowner is concerned about several large cracks running across the back wall of his house. They seem to be getting worse, and he thinks they are cause by the tree roots affecting the foundations. He has done some digging and suspects that his neighbor's tree is the culprit. The neighbor denies this, insisting that one the tree in the homeowner's own garden is responsible. How could the neighbor establish who is right?

Q2: Basmati rice is more expensive than other types of rice. The name basmati can only be used for certain variation of long grain rice grown in India and Pakistan. The rice association says that basmati rice must not contain more than 7% non-basmati rice but cheaper rice varieties are often mixed with basmati and sold as basmati. In tests on 382 UK basmati sample, 46% were found to contain more than 7% non-basmati rice; some samples were more than 60% non-basmati.
DNA profiling is used to determine if samples exceed the 7% limit. Suggest how DNA profiling can be used to check the quality if rice samples.
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Offline Romeesa-Chan

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #542 on: September 16, 2011, 10:49:53 pm »
^Do you have the answers for them ?
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #543 on: September 16, 2011, 10:52:50 pm »
^Do you have the answers for them ?
No  :-\
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #544 on: September 17, 2011, 12:05:01 pm »
Please, can someone help.  ::)
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Offline Romeesa-Chan

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #545 on: September 17, 2011, 01:43:56 pm »
No  :-\
Where did you get it from ? :-\

Try asking MKh. She might be able to help.

Answer 2: DNA profiling can be done by Electropherosis.
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #546 on: September 17, 2011, 02:13:33 pm »
Where did you get it from ? :-\

Try asking MKh. She might be able to help.

Answer 2: DNA profiling can be done by Electropherosis.
I think its from the A2 SNAB biology book.

Hmm okey.

Thanks anyways
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Offline Malak

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #547 on: November 19, 2011, 05:40:05 pm »
Can anyone list down the main points for the practical: Measuring the effectiveness of an antibiotic

Thanks
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Offline Romeesa-Chan

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #548 on: November 21, 2011, 04:48:43 am »
in biology for all units,

the first spec . point, it says---

Demonstrate knowledge and understanding of the practical and investigate skills in numbers 4 and 5 in the table of how Science Works on page 13 of this specification..

wat does that mean and wat does it want to know from us??? pls tel me about this???

I guess (not sure), it might be referring to a table from the Edexcel Biology textbook.

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Offline MKh

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #549 on: November 21, 2011, 01:25:45 pm »
Can anyone list down the main points for the practical: Measuring the effectiveness of an antibiotic
Thanks
This core practical is in the A2 context? It is in the A2 Biology Revision Guide.
But don't forget to mention:
The independent variable (1 mark)
The dependent variable (1 mark)
Exactly how u will measure the dependent variable (1 mark)
Reference to repeats (1 mark)
Reference to a control u may keep (1 mark)
Other variables that might affect the dependent variable (1 mark)
How you will control the other variables (1 mark)
How the dependent variable indicates the effectiveness of the antibiotic (1 mark)
Suitable timescale over which u will measure the dependent variable - do not state 'the next day' but state 'after 24 hours' or so (1 mark)

When u write down ur investigation, read it and ask urself  'can someone else repeat the investigation with my plan?'

Hope u get it.

Offline jackfos92

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Why does heart rate increase while individual anticipates exercise?
« Reply #550 on: November 24, 2011, 02:09:34 pm »
Biology,

Why does heart rate increase while individual anticipates exercise?

GCE edexcel student.

Thx in advance!

Amelia

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Re: Edexcel Biology Doubts
« Reply #551 on: November 24, 2011, 03:28:02 pm »
Biology,

Why does heart rate increase while individual anticipates exercise?

GCE edexcel student.

Thx in advance!

The anticipatory response is mediated through the releases of a neurotransmitters called epinephrine and norepinephrine also known as adrenaline and noradrenaline.

The sympathetic channel of the CNS increases heart rate by releasing the neural hormones - epinephrine and norepinephrine. These hormones are cardio accelerators. Before an event begins, if the individual anticipates with excitement and enthusiasm the event, heart rate increases dramatically without any muscular involvement. This provides the rapid mobilization of it's bodily reserves by revving the body's engine

Offline jackfos92

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Re: Edexcel Biology Doubts
« Reply #552 on: November 24, 2011, 03:51:51 pm »
The anticipatory response is mediated through the releases of a neurotransmitters called epinephrine and norepinephrine also known as adrenaline and noradrenaline.

The sympathetic channel of the CNS increases heart rate by releasing the neural hormones - epinephrine and norepinephrine. These hormones are cardio accelerators. Before an event begins, if the individual anticipates with excitement and enthusiasm the event, heart rate increases dramatically without any muscular involvement. This provides the rapid mobilization of it's bodily reserves by revving the body's engine

How about the purpose of anticipatory response? is it provide the rapid mobilization of its bodily reserves by reciving the body's engine?

Amelia

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Re: Edexcel Biology Doubts
« Reply #553 on: November 24, 2011, 04:08:26 pm »
How about the purpose of anticipatory response? is it provide the rapid mobilization of its bodily reserves by reciving the body's engine?

Yes, that's the advantage of it.

Offline jackfos92

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Re: Edexcel BIOLOGY Doubts!!!!
« Reply #554 on: November 29, 2011, 11:06:28 am »
Edexcel unit 5

What is the difference between adaptation and habituation?

Thx in advance