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Figure 3 shows the banding pattern of a single sarcomere - AQA - A-Level Biology - Question 4 - 2020 - Paper 2
Question 4
Figure 3 shows the banding pattern of a single sarcomere. Explain the banding pattern shown in Figure 3.
Worked Solution & Example Answer:Figure 3 shows the banding pattern of a single sarcomere - AQA - A-Level Biology - Question 4 - 2020 - Paper 2
Step 1
Explain the banding pattern shown in Figure 3.
Answer
The banding pattern in a sarcomere consists of several distinct regions:
- The light band is formed solely by actin filaments, which appear lighter in staining compared to myosin.
- The H zone or band is primarily composed of myosin filaments, indicating a region where there are no overlapping actin filaments.
- The darkest region, also known as the overlapping region, contains both actin and myosin filaments, appearing darker due to the presence of both types of proteins overlapping.