Naturally Occurring Polymers - DNA
Chemistry: AQA GCSE Higher, topic 7.2.18
DNA
DNA (deoxyribonucleic acid) is a massive molecule that is crucial for life as we know it.
What is the role of DNA?
- DNA encodes (produces) the genetic instructions used in the development, functioning and reproduction of living organisms and viruses.
What is the shape of DNA?
- Most DNA molecules are made up of 2 polymer chains arranged in the form of a double helix.
What are the main components of DNA?
- The polymers are made from monomers known as nucleotides. Each nucleotide contains 1 of the following 4 nitrogenous bases:
- Adenine (A)
- Thymine (T)
- Cytosine (C)
- Guanine (G)
Test yourself on Naturally Occurring Polymers - DNA
What three things does DNA's genetic code control in living organisms and viruses?
A crystal is not a living organism or a virus. Based on the role of DNA, would a crystal be expected to contain DNA that encodes genetic instructions?
A molecule is made of only one polymer chain that is not twisted with another chain. Based on how DNA's structure is described, would this molecule match the typical structure of DNA?
What are the properties of DNA?
A student claims that a single DNA nucleotide can contain both cytosine and adenine at the same time. What is incorrect about this claim?