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Module 2: Foundations in biology
Quick questions on Water and carbohydrates: properties of water, glycosidic bonds and the sugar tests - OCR A-Level Biology A
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is water?Show answer
Water is a polar molecule: oxygen pulls the shared electrons more strongly than hydrogen, so oxygen carries a slight negative charge and the hydrogens a slight positive charge. This polarity lets water molecules form hydrogen bonds with each other, which explains nearly every property OCR asks about.
What is q1?Show answer
Explain why ice floating on a pond is important for organisms living in the water. [2 marks]
What is q2?Show answer
Name the bond formed when two alpha-glucose molecules join, and the type of reaction involved. [2 marks]
What is q3?Show answer
State the colour change for a positive iodine test for starch. [1 mark]
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