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Edexcel BIOLOGY Doubts!!!!

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MKh:
Salaam all, I have a few qns regarding the core practicals for Edexcel AS Bio:

We get practical-related questions in all three of the AS Bio papers - U1,U2 & U3B. We are usually asked to write down the procedures of the core practicals like the Daphnia and the Vitamin C core practical questions. Could anyone of you write down the appropriate step-by-step procedure of each of the following core practicals along with 1) the safety precautions that we have to take and 1) the associated risks, and 3) the variables/factors to be controlled in these investigations and 4) how to control these variables/factors and also 5) what if these variables/factors are not controlled??

Unit 2, Topic 4: 1. Describe how to determine the tensile strength of plant fibres practically.

2. Describe how to investigate plant mineral deficiencies practically.

3. Describe how to investigate the antimicrobial properties of plants.

I have already checked out the AS Bio Core pracs worksheet which you guys must already be aware of but it doesn't seem to help much in understanding step-by-step procedures of these core pracs....What are the steps your teachers taught you for these core pracs?  We can be asked to write down the procedures of these core pracs, that is why I asked.

Any other help/suggestions regarding AS Bio core pracs would be highly appreciated… Thanks all...

:)

dragon_knight:
how should we prepare for unit 6 internation alternative to practical of edexcel biology?

and any references that could teach me the statistical tests in unit 6, and any tips for answering paper 6?

mayisha:
Suggest an explanation for why a whole muscle might respond differently to a stimulus than a single fibre ... its from the edexcel bio a2 book

Amelia:

--- Quote from: mayisha on April 19, 2011, 04:04:58 am ---Suggest an explanation for why a whole muscle might respond differently to a stimulus than a single fibre ... its from the edexcel bio a2 book

--- End quote ---

 Muscles consist of large numbers of (long cells) muscle fibres bound together by connective tissue. They can contract (shorten) to do work. When they relax, they can be pulled back to their original length.

The whole muscle will respond differently because different fibres have different tresholds and contract with different strengths.

Here

moalna:
1. Explain why base pairs are a suitable way of measuring length of a piece of a DNA?

2. Explain why (1) Penicillin, (2) Tetracyclin and (3) Quinolones are not effective against viruses?

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