ATP

ATP

Question 1

ATP is the immediate source of energy for muscle contraction. The resting concentration of ATP in skeletal muscle is approximately 5.4×10−3 mmol g−15.4 \times 10^{-3}\text{ mmol g}^{-1}5.4×10−3 mmol g−1. During maximum intensity exercise, ATP in skeletal muscle is hydrolysed at a rate of approximately 3.6 mmol kg−1 s−13.6\text{ mmol kg}^{-1}\text{ s}^{-1}3.6 mmol kg−1 s−1. If ATP was not continuously resynthesised by metabolic pathways, maximum exercise could only be sustained for a very short duration.

Calculate how long maximum exercise would last if ATP was not resynthesised. Show your working.

[2]
Question 2

ATP is the immediate source of energy for muscle contraction. In the pectoralis (flight) muscle of the ruby-throated hummingbird (Archilochus colubris), the resting concentration of ATP is approximately 9.1 × 10-3 mmol g-1. During rapid hovering flight, ATP in this muscle is hydrolysed at a rate of approximately 6.5 mmol kg-1 s-1.

Calculate how long this hummingbird could sustain hovering flight if ATP was not continuously resynthesised. Show your working.

[2]
Question 3

ATP is the immediate source of energy for muscle contraction in insects. In the flight muscle of the honeybee (Apis mellifera), the resting concentration of ATP is approximately 6.3×10−3 mmol g−16.3 \times 10^{-3}\text{ mmol g}^{-1}6.3×10−3 mmol g−1. During active flight, ATP in the flight muscle is hydrolysed at a rate of approximately 14.0 mmol kg−1 s−114.0\text{ mmol kg}^{-1}\text{ s}^{-1}14.0 mmol kg−1 s−1.

If ATP was not continuously resynthesised, calculate how long active flight could be sustained using only the resting ATP store. Show your working.

[2]

ATP Questions

Practise AQA A Level Biology ATP with exam-style questions for A Level Biology. 3 questions covering ATP, matched to the AQA A Level Biology (7402) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

ATP Questions

  1. A Level
  2. /Biology
  3. /ATP