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Rhododendron ponticum (pictured below) is a fast-growing, non-native, invasive species currently threatening biodiversity in the UK. ponticum forms large thickets and outcompetes native plants such as bryophytes, other woody plants and wildflowers Pastry cream or confectioners’ custard is made with a combination of milk (rich in casein and lactose), egg yolks, sugar, starch and a flavouring such as vanilla. IB past papers Biology TZ1 and TZ2 SL 2019. Communication with other cells by means of glycoproteins. Computer science paper 1 - Computer science paper 2 - Computer science paper 2 - Computer science paper 3 - Design technology paper 1 - Design technology paper 1 - Design technology paper 2 : Design technology paper 3 - Environmental systems and societies paper 1 question booklet - Environmental systems and societies paper 1 text booklet Terms and conditions. Amino acids can be linked together in any sequence giving a huge range of possible polypeptides. 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