AP - Unit 3: Photosynthesis

Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

• CO2 and glucose
• H2O and O2
• electrons and H+
• ATP and NADPH

Where does the Calvin cycle take place?

• stroma of the chloroplast
• thylakoid membrane
• outer membrane of the chloroplast
• interior of the thylakoid membrane

When oxygen is released as a result of photosynthesis, it is a direct by-product of

• reducing NADP+
• splitting water molecules
• chemiosmosis
• electron transfer in photosystem II and I

Tags

NGSS.MS-LS1-6

In a plant cell, where are ATP synthase complexes located?

• thylakoid membranes only
• inner mitochondrial membranes only
• thylakoid membrane and inner mitochondrial membranes
• thylakoid membrane and plasma membranes

In photosynthetic cells, synthesis of ATP occurs during

• photosynthesis only

• cellular respiration only

• both photosynthesis and cellular respiration

• photophosphorylation only

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-7

What is the primary function of the Calvin cycle?

• regenerate ATP for use in the light reactions of photosynthesis
• produce carbon dioxide for use in the light reactions of photosynthesis
• produce oxygen by oxidizing water
• produce simple sugars from carbon dioxide

Reactions that consume CO2 take place in

• the light reactions of photosynthesis only
• the calvin cycle only
• the light reactions and the calvin cycle
• the calvin cycle and the citric acid cycle

Tags

NGSS.HS-LS2-5

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

• fix CO2 into organic acids during the night when temperatures are cooler.
• fix CO2 into by combining it with RuBP in the Calvin cycle.
• obtain CO2 through their roots during the day.
• fix CO2 into organic acids in the mesophyll cells, which do not rely on stomata.

Compared to C3 plants, C4 plants

• have higher rates of photorespiration.

• can continue to fix CO2 even at relatively low CO2 concentrations and high oxygen concentrations.

• do not use rubisco for carbon fixation.

• grow better under cool, moist conditions.

What supplies the electrons that are lost in PS I?

• the electrons from PS II
• water
• glucose
• oxygen