Use words from the box to complete the sentences - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1
Question 4
Use words from the box to complete the sentences.
A DNA molecule consists of two coiled strands that form a ____________________ helix.
The strands are held togethe... show full transcript
Worked Solution & Example Answer:Use words from the box to complete the sentences - Edexcel - GCSE Biology - Question 4 - 2013 - Paper 1
Step 1
A DNA molecule consists of two coiled strands that form a ____________________ helix.
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Answer
double
Step 2
The strands are held together by ____________________ bonds between the bases.
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Answer
hydrogen
Step 3
A ____________________ is a section of a DNA molecule that codes for a specific protein.
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Answer
gene
Step 4
Which two scientists were the first to build a 3D model of a DNA molecule?
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Answer
James Watson and Francis Crick
Step 5
Describe how two proteins can be different shaped molecules.
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Answer
Proteins can have different shapes due to variations in their amino acid sequences, which result in unique three-dimensional structures. This affects their functions and interactions.
Step 6
Suggest what may have happened to the DNA to cause a protein to form the wrong shape.
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Answer
Mutations may have occurred in the DNA sequence, leading to the production of altered proteins with incorrect shapes.
Step 7
Some proteins are enzymes. Enzymes are
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Answer
biological catalysts.
Step 8
State the term used to describe organisms that have identical DNA.
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