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6. The uptake of water by substances that do not dissolve in water, and
   results in swelling of the substance. (10)


7. Denoting a compound consisting of molecules that have only single
   bonds. (9)


8. A fat-soluble vitamin that cannot be synthesised by mammals and other
   vertebrates and must be provided in the diet. (7)


9. A neuron that has one main process, the axon, extending from its cell
   body. (8)


10. The outermost layer of cells of the body of an animal. (9)


11. A horizontal underground stem that often sends out roots and shoots
    from its nodes. (7)


12. Any enzyme that breaks down nucleic acids into nucleotides. (8)


13. A floral arrangement in which the ovary is completely enclosed by the
    receptacle so that stamen and perianth arise above it, from the top of
    the receptacle. (7)


14. The thickened horny forewings of the beetles, which cover and protect the
    membranous hindwings when the insect is at rest. (6)


15. A coenzyme derived from the vitamin B (nicotinic acid), that participates
    in many biological dehydrogenation reactions. (3)
    

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2. An antibiotic produced from Class Actinomycetes
   which was the first drug to be successful against
   tuberculosis. (12)


3. A light harvesting structure containing aggregates
   of photosynthetic accessory pigments that is
   located on the surface of thylakoid membranes in
   all cyanobacteria and red algae. (14)


4. A common benign tumour composed of well
   differentiated fat cells. (6)


5. A technique for in vitro fertilisation in which
   an individual sperm cell is introduced into an egg
   cell. (4)


6. The consumption of vegetation usually on
   grassland by animals particularly cattle and sheep.
   (7)


7. A group of cells, which can be microorganisms or
   of animal or plant origin, that are grown under
   specific conditions of nutrient levels, temperature,
   pH, oxygen levels, osmotic factors, light, pressure
   etc. (7)


8. An inherited pattern of behaviour that appears in
   a similar form in all normally reared individuals of
   the same sex and species. (6)


9. The aqueous fluid formed by the excretory organs
   of animals for the removal of metabolic waste
   products. (5)


10. The function or position of an organism or population
    within an ecological community. (5)


11. A white colloidal carbohydrate of high molecular
    weight that occurs in ripe fruit and vegetables. (6)


12. A bottom-living marine fish, commonly known as ‘Electric Ray’
    which discharges electricity that is sufficient to make the prey
    unconscious. (7)


13. The angle between a branch or leaf and the stem it grows from. (4)


14. Tissue consisting of protein fibrils that may accumulate between cells in
    various animal tissues. (7)


15. They are one internode long small runners which are found in rosette
    plants at the ground or water level. (6)


16. A fleshy fruit that develops from either one or several fused carpels and
    contains one or many seeds. (5)


17. A scientist who crystallised Tobacco Mosaic Virus (TMV) for the first
    time. (7)

DOWN

1. The removal of introns and fusion of exons to form functional RNAs. (8)


2. The number of infectious virus particles present in a suspension. (5)


3. The third geological epoch of the Palaeocene period. (9)


4. A technique of injecting substances into cells, cell organelles and other
   microscopic structures using a micropipette. (14)