Learning objective
Explain condensation reactions forming the sugar-phosphate backbone.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Topic
Amino acids, proteins and DNA (A-level only)
Subtopic
DNA chemistry (A-level only)
Study support
Understand this objective
Quick explanation
Explain condensation reactions forming the sugar-phosphate backbone
- This point belongs to Amino acids, proteins and DNA (A-level only), especially DNA chemistry (A-level only).
- You need to be able to explain condensation reactions forming the sugar-phosphate backbone.
- The key ideas to know are sugar and phosphate.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect DNA chemistry (A-level only) to exam-style questions, flashcards, and revision notes for Amino acids, proteins and DNA (A-level only).
Quick student answer
Which of the following correctly describes the condensation reaction that forms the sugar-phosphate backbone of DNA?
Direct answer
B. Two nucleotides join together by forming a phosphodiester bond.
Key terms
- Condensation Reaction: A chemical reaction in which two molecules combine to form a larger molecule, with the loss of a small molecule, typically water.
- Phosphodiester Bond: A covalent bond that connects the phosphate group of one nucleotide to the sugar of another nucleotide in the DNA backbone.
Common trap
Confusing condensation with hydrolysis: Remember that condensation reactions build larger molecules by removing water, while hydrolysis reactions break down molecules by adding water.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Describe amino acids as molecules containing amine and carboxylic acid groups.
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- Draw peptide bonds and explain condensation.
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- Explain hydrolysis of proteins.
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- Describe the components of DNA nucleotides.
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