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.
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1.2 Describe the ... 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
Which diagram represents a DNA molecule?
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Answer
The diagram that represents a DNA molecule is the one that resembles a double helix. DNA is characterized by its twisted structure, which consists of two strands coiled around each other.
Step 2
Describe the structure of a DNA molecule.
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Answer
A DNA molecule consists of two strands that are twisted into a double helix shape. These strands are long polymers, made up of nucleotides, which contain a sugar, a phosphate group, and a nitrogenous base. The strands are held together by hydrogen bonds between complementary bases.
Step 3
A gene codes for a particular sequence of ____________________.
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Answer
A gene codes for a particular sequence of amino acids.
Step 4
This sequence makes a specific ____________________.
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Answer
This sequence makes a specific protein.
Step 5
What is meant by the term genome?
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Answer
The term genome refers to all the genetic material of an organism, including all of its genes.
Step 6
Which important scientific advance was made using knowledge of the human genome?
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Answer
Tracing how aboriginal people spread across Australia.
Step 7
What scientific term describes differences in characteristics between individuals of a species?
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Answer
The scientific term that describes these differences is 'variation'.
Step 8
Suggest why there might be an increasing number of snails similar to snail P in each future generation.
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Answer
There might be an increasing number of snails similar to snail P in future generations because they may be stronger or larger, making them more likely to survive and breed. Additionally, if they are better camouflaged, they are less likely to be eaten, allowing them to pass on their genes more successfully.
