Photosynthesis MCQ

Photosynthesis is the process

• by which plants capture light energy and use it to produce their own organic compounds

• by which bacteria capture glucose and use it to produce energy

• by which animals produce energy

• that only occurs in prokaryotic organisms

Photosynthesis occurs in

• mitochondria

• ribosomes

• the golgi apparatus

• chloroplasts

the light-dependent stage of photosynthesis occurs in the

• cristae

• thylakoid membrane

• stroma

• chlorophyll

Answer explanation

The light independent stage occurs in the stroma.

The light dependent stage occurs in the thylakoid membranes / grana.

Thylakoid membranes contain chlorophyll which is a pigment. The light dependent stage relies on chlorophyll to capture sunlight energy, but photosynthesis doesn't occur IN the chlorophyll. They are part of the thylakoid membranes.

ATP is produced during the light-dependent stage. What is this ATP used for?

• it is a waste product and not used for anything

• to split water

• to provide the energy needed for the light-independent stage

• to absorb the light energy required for photosynthesis

A major product of photosynthesis is

• carbon dioxide

• ATP

• NADPH

• glucose

At which stage of photosynthesis is oxygen released as a by-product?

• The light-independent stage

• The light-dependent stage

• During the Calvin cycle

• During Krebs cycle

ATP is the universal source of free energy for all living organisms. It is composed of adenine and ribose with how many phosphate groups attached?

• 1

• 2

• 3

• 4

• requires energy

• is irreversible

• provides the energy needed to drive cellular processes

• only occurs in prokaryotes

In periods of high light intensity, the rate of photosynthesis will

• increase indefinitely

• increase until another factor like carbon dioxide becomes limiting

• decrease indefinitely

• decrease until another factor such as carbon dioxide becomes limiting

Rubisco is the enzyme that enables carbon dioxide to join with the 5C intermediate Ribulose biphosphate in order to continue through the metabolic pathway that produces glucose.

It would be expected that rubisco is found in high concentrations in the

• cytoplasm

• matrix

• stroma

• thylakoid

Answer explanation

Rubisco is the enzyme that catalyses the Calvin cycle as part of the light independent stage of photosynthesis. This occurs in the stroma.