Photosynthesis & Limiting Factors - exam practice

Phospholipid bilayers play crucial roles within plant cells.

Which statement(s) linked to the importance of membranes in plant cells is/are true?

1 - ATP synthase embedded in thylakoid membranes maintains chemiosmotic gradients

2 - phospholipid bilayers within the chloroplast are impermeable to protons

3 - thylakoid membranes contain electron transport chain proteins

RuBisCO is an enzyme that fixes carbon dioxide in photosynthesis. In some conditions, RuBisCO also carries out oxygen fixation.

The graph below shows how the carbon dioxide and oxygen fixing activities of RuBisCO are affected by temperature.

What are the correct percentage changes in RuBisCO carbon dioxide and oxygen fixing activities between 30°C and 40°C?

What is the source of electrons in photosynthesis?

Photolysis is the process of splitting water using light energy.

What is the region of the chloroplast in which this process takes place?

The statements below relate to the Calvin cycle:

1 - molecules of triose phosphate are required for the synthesis of nucleic acids

2 - the production of triose phosphate from glycerate-3-phosphate requires ATP and reduced NAD

3 - reactions of the Calvin cycle occur at a faster rate when stomata are closed

Which statement(s) is/are correct?

What is the location of ATP synthase in a chloroplast?

Photosynthetic pigments in a leaf were separated using paper chromatography.

The resulting chromatogram is shown below.

What is the retention factor (Rf) for the most soluble pigment?

How many molecules of CO₂ must enter the Calvin cycle to produce one molecule of glucose?

Which enzyme catalyses the fixation of carbon dioxide in the Calvin cycle?

In the Calvin cycle, what molecule does CO₂ initially combine with?

Which molecule is the final electron acceptor in the light-dependent reactions?

What is the main purpose of the light-dependent reactions in photosynthesis?