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Which diagram shows the correct arrangement and labelling of the strands found in a section of a molecule of DNA? A B C D - Scottish Highers Human Biology - Question 4 - 2022
Question 4
Which diagram shows the correct arrangement and labelling of the strands found in a section of a molecule of DNA? A B C D
Worked Solution & Example Answer:Which diagram shows the correct arrangement and labelling of the strands found in a section of a molecule of DNA? A B C D - Scottish Highers Human Biology - Question 4 - 2022
Step 1
Identify the correct diagram
Answer
To determine the correct arrangement of DNA strands, we need to understand the structure of DNA. DNA is made up of two strands that run in opposite directions, known as antiparallel strands. The labeling often involves noting the 5' and 3' ends of each strand. Upon analyzing the diagrams:
- Diagram A shows two strands but does not correctly label the 5' and 3' ends.
- Diagram B incorrectly has both strands labeled in the same direction.
- Diagram C correctly shows one strand labeled 5' to 3' and the opposite strand 3' to 5', adhering to the antiparallel nature of DNA.
- Diagram D also mislabels the strands.
Therefore, the correct diagram is C.