IB Biology HL Theme C: Interaction and interdependence questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

Type
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Question 1

Paper 2Easy6 marks

During aerobic respiration, electrons pass along the electron transport chain in the inner mitochondrial membrane. Answer the following questions about the proton gradient and ATP synthesis.

(a)

State how energy released as electrons pass along the electron transport chain is used, and state the direction in which protons are moved across the inner mitochondrial membrane.

[2]
(b)

State the difference in proton concentration across the inner mitochondrial membrane that results.

[1]
(c)

State the direction in which protons move through ATP synthase.

[1]
(d)

Explain how the movement of protons through ATP synthase results in ATP synthesis.

[2]

Question 2

Paper 2Easy5 marks

During a simplified accounting of the Calvin cycle in a leaf, six molecules of triose phosphate are produced. One molecule leaves as net product; the remainder is used to regenerate RuBP.

(a)

Determine the number and fraction of the triose phosphate molecules used to regenerate RuBP.

[2]
(b)

State the number of RuBP molecules regenerated from these five triose phosphate molecules.

[1]
(c)

Explain the role of ATP in RuBP regeneration and why regenerated RuBP is needed for the Calvin cycle to continue.

[2]

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