This question is about DNA and genes - AQA - GCSE Biology: Combined Science - Question 1 - 2020 - Paper 2
Question 1
This question is about DNA and genes.
1.1 Which diagram represents a DNA molecule?
Tick (✓) one box.
1.2 Describe the structure of a DNA mol... show full transcript
Worked Solution & Example Answer:This question is about DNA and genes - AQA - GCSE Biology: Combined Science - Question 1 - 2020 - Paper 2
Step 1
1.1 Which diagram represents a DNA molecule?
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Answer
The diagram that represents a DNA molecule is the one that shows a double helix structure, which looks like two twisted strands or chains.
Step 2
1.2 Describe the structure of a DNA molecule.
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Answer
A DNA molecule consists of two strands that are twisted together to form a double helix. Each strand contains nucleotides, which are made up of a sugar, a phosphate group, and a nitrogenous base.
Step 3
1.3 A gene is a small section of DNA on a chromosome. Complete the sentences.
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A gene codes for a particular sequence of amino acids. This sequence makes a specific protein.
Step 4
1.4 What is meant by the term genome?
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The genome refers to all the genetic material of an organism, including all of its DNA and genes.
Step 5
1.5 Which important scientific advance was made using knowledge of the human genome?
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The important scientific advance made using knowledge of the human genome is tracing how aboriginal people spread across Australia.
Step 6
1.6 What scientific term describes differences in characteristics between individuals of a species?
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Answer
The scientific term that describes differences in characteristics between individuals of a species is variation.
Step 7
1.7 Suggest why there might be an increasing number of snails similar to snail P in each future generation.
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There might be an increasing number of snails similar to snail P in future generations because snail P possesses traits that make it stronger or larger, allowing it to survive and breed more successfully. Additionally, if snail P is better camouflaged, it could be less likely to be eaten, further increasing its chances of passing on its genes.
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