AQA · Chemistry · 8462
GCSE Chemistry: DNA (deoxyribonucleic acid) and other naturally occurring polymers
Organic chemistry · AQA GCSE Chemistry (8462), specification point 4.7.3.4. Cards are generated from the exam board's own specification for "DNA (deoxyribonucleic acid) and other naturally occurring polymers", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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What does DNA stand for?
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Deoxyribonucleic acid.
What is the biological role of DNA?
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It encodes the genetic instructions for the development and functioning of living organisms and viruses.
How many polymer chains make up most DNA molecules?
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Two, arranged in a double helix.
Most DNA molecules are two polymer chains in the form of a ?.
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double helix
What are the monomers of DNA called?
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Nucleotides.
How many different nucleotide monomers make up DNA?
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Four.
Name three naturally occurring polymers, other than DNA, that are important for life.
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Proteins, starch and cellulose.
From which monomers are proteins made?
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Amino acids.
From which monomer are starch and cellulose made?
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Glucose (a sugar).
On what three kinds of observable result are qualitative chemical tests based?
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A gas with distinctive properties, a colour change, or an insoluble solid (precipitate).
When are instrumental methods of chemical analysis particularly useful?
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When the amount of chemical being analysed is small — they are fast, sensitive and accurate.
An insoluble solid that forms during a chemical test is called a ?.
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precipitate
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