HARD
AS and A Level
IMPORTANT
Earn 100
The average length of a sarcomere in a resting muscle is 2.25 . Calculate the magnification of your diagram and state the steps you took in making the calculation.
Important Questions on Control and Coordination
MEDIUM
AS and A Level
IMPORTANT
LSs and TSs of striated muscle fibres were examined in an electron microscope. In the given picture shows drawings of the structures visible in a sarcomere in LS and TS as seen in a TEM. Explain why an electron microscope rather than a light microscope was used to study these sections.
MEDIUM
AS and A Level
IMPORTANT
Name the structures A, B, and C in the given figure.
MEDIUM
AS and A Level
IMPORTANT
Name the regions of the sarcomere labelled D, E and F in the given figure.
HARD
AS and A Level
IMPORTANT
State the region of the sarcomere where the TS was taken as shown in the given figure.
HARD
AS and A Level
IMPORTANT
Explain how the sliding of filaments in a sarcomere leads to the contraction of a muscle fibre.
MEDIUM
AS and A Level
IMPORTANT
Describe the similarities and differences between the structure and function of interneuronal synapses and neuromuscular junctions.
HARD
AS and A Level
IMPORTANT
Explain why striated muscle tissue produces lactate during strenuous exercise.
HARD
AS and A Level
IMPORTANT
Plant physiologists have found that solutions of ABA with concentrations as low as 5.0 dm-3 will cause stomata to close. How will you prepare a range of solutions of ABA from a stock solution of 1.0 mmol dm-3 and use the solutions to find the lowest concentration that stimulates stomatal closure in leaves of Arabidopsis thaliana?
