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  • Biology Factsheet: 139. Answering Exam Questions on the Heart

    Biology Factsheet: 139. Answering Exam Questions on the Heart

    When answering most exam questions on the heart it is essential that you know the basic anatomy of the heart, the cardiac cycle and how  the heart beat is controlled. You will be able to interpr...

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  • Biology Factsheet: 140. Absorption in the Small Intestine

    Biology Factsheet: 140. Absorption in the Small Intestine

    This topic appears regularly in exams of all the Boards. This is not because  it is particularly difficult – in fact it’s pretty straightforward -  but because:  1. it can...

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  • Biology Factsheet: 141. Forests and Energy Cycles

    Biology Factsheet: 141. Forests and Energy Cycles

    Examiners commonly set questions which test students ability to apply  their knowledge of the C and N cycle to forest ecosystems. Examiners like  these questions because students often:&nb...

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  • Biology Factsheet: 142. Modern Examples of Evolution in Action

    Biology Factsheet: 142. Modern Examples of Evolution in Action

    Natural selection was proposed by Darwin and by Wallace as being the mechanism by which new species arise from pre-existing species. ...

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  • Biology Factsheet: 144. Spearmanís Rank Correlation Coefficient

    Biology Factsheet: 144. Spearman's Rank Correlation Coefficient

    Spearman's Rank is one method of measuring the correlation between two variables. Correlation may be:  • positive (large values of one variable associated with large values of the other var...

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  • Biology Factsheet: 145. Blood Sugar and its Control

    Biology Factsheet: 145. Blood Sugar and its Control

    The main sugar carried in blood is glucose but many other sugars, for example, fructose, galactose, lactose, ribose, arabinose and xylose may be present  in small quantities. ...

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  • Biology Factsheet: 146. Tracheids, Vessels and Sieve Tubes

    Biology Factsheet: 146. Tracheids, Vessels and Sieve Tubes

    Tracheids, vessels and sieve tubes are found in the vascular tissue of the plant.  • Tracheids and vessels are found in the xylem tissue and conduct water and dissolved mineral ions from th...

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  • Biology Factsheet: 147. Ageing

    Biology Factsheet: 147. Ageing

    An adult organism is not a static being but continues to change and develop,  until the developmental processes are brought to an end by death. The  word ‘ageing’ describes the...

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  • Biology Factsheet: 148. Industrial Uses of Enzymes

    Biology Factsheet: 148. Industrial Uses of Enzymes

    This Factsheet will outline the major advantages and uses of enzymes in  commercial and industrial processes. More than 300 enzymes are now  used commercially. Most of these come from bact...

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  • Biology Factsheet: 149. High Altitude Biology

    Biology Factsheet: 149. High Altitude Biology

    This Factsheet will:  1. Summarise the human physiological responses to high altitude.  2. Give examples of the type of application and synoptic question that  have appeared recently...

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