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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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  • Biology Factsheet: 150. Answering Exam Questions on the Kidney

    Biology Factsheet: 150. Answering Exam Questions on the Kidney

    This Factsheet is aimed at those students who want to get full marks on kidney questions. If you are unsure of basic kidney structure or function, please  read Factsheet No. 1 first! ...

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  • Biology Factsheet: 151. Control of the Human Heart

    Biology Factsheet: 151. Control of the Human Heart

    This Factsheet explains, in detail, the way in which the human heart is  controlled. Common misunderstandings shown by A - C grade students  are summarised. ...

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  • Biology Factsheet: 152. Phospholipids

    Biology Factsheet: 152. Phospholipids

    Phospholipids are important biological compounds found in the membranes of organelles (e.g mitochodria) and plant and animal cells,  including plasma, mitochondrial, chloroplast and bacterial me...

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  • Biology Factsheet: 153. The Light Dependent Stage of Photosynthesis

    Biology Factsheet: 153. The Light Dependent Stage of Photosynthesis

    This Factsheet focusses on te first stage of photosynthesis: the light dependent stage. It updates Factsheet 2 (The essential guide to photosynthesis) 1994  and reviews the exam questions which ...

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