IB BIO 8.3 HL

Which technological advance enabled Calvin to perform his lollipop experiment on the light-independent reactions of photosynthesis in 1949?

• Methods for tracing radioactive carbon incorporated in molecules produced by the alga Chlorella

• Development of electron microscopes enabling the molecules produced by the alga Scenedesmus to be viewed

• Methods for changing the wavelength of light shining on the alga Scenedesmus contained in the lollipop

• Development of X-ray diffraction techniques enabling the molecules produced by the alga Chlorella to be identified

Which of the following factors influence(s) the rate of oxygen production in photosynthesis?

I. Temperature

II. Wavelength of light

III. Number of mitochondria

• I only

• I and II only

• II and III only

• I, II and III

What reaction, involving glycerate 3-phosphate, is part of the light-independent reactions of photosynthesis?

• Glycerate 3-phosphate is carboxylated using carbon dioxide.

• Two glycerate 3-phosphates are linked together to form one hexose phosphate.

• Glycerate 3-phosphate is reduced to triose phosphate.

• Five glycerate 3-phosphates are converted to three ribulose 5-phosphates.

Which reaction does not cause a net release of energy?

• ADP combines with inorganic phosphate to form ATP

• ATP releases inorganic phosphate to form ADP

• Loss of hydrogen from reduced NAD

• Oxidation of reduced FAD

In the light-dependent reactions of photosynthesis what supplies low energy electrons to photosystem II?

• Photolysis of water

• Reduction of NADP+

• Chemiosmosis

• Photosystem I

What process occurs during the light-independent reactions of photosynthesis?

• Oxygen is released into the atmosphere.

• Protons are pumped from the thylakoid space to the stroma.

• RuBP is carboxylated then regenerated in the Calvin cycle.

• Triose phosphate is converted to glycerate 3-phosphate.

Which of the following is a role of ATP in photosynthesis?

• It provides the energy to make carbohydrate molecules.

• It splits water molecules to form oxygen and hydrogen.

• It breaks down pyruvate into carbon dioxide.

• It converts light energy into chemical energy.

What occurs during the light-independent reactions of photosynthesis?

• ATP is produced.

• Ribose reacts with carbon dioxide to form glucose.

• Energy for the cycle is provided by the light-dependent reaction.

• Darkness stimulates the conversion of glucose to starch.

What causes cyclic photophosphorylation to occur in photosynthesis?

• Reduced NADP is accumulating in the stroma.

• Photoactivation of photosystem II is inhibited.

• Light-dependent reactions are slower than light-independent reactions.

• ATP is not required for the Calvin cycle.

Where are complex carbohydrates made in the chloroplast?

• In the intermembrane space

• In the stroma

• On the inner membrane

• In the thylakoid space