Biology Chapter 5 - Photosynthesis

Describe the purpose of photosynthesis

Answer explanation

Photosynthesis is the biological processin which photoautotrophs capture light energy to power the production of glucose and oxygen from carbon dioxide.

Stage 1 of Photosynthesis

Location of Stage 1 Photosynthesis

• Stroma

• Mitochondria

• Granum / Grana

• Thylakoid

Which is NOT an input of Stage 1 Photosynthesis?

• H20

• CO2

• ADP + Pi

• NADPH2

Write the balanced chemical equation of Photosynthesis

Answer explanation

Light Energy

6CO2 + 12H20 -----------------> C6H1206 + 602 + 6H20

Chlorophyll A

Describe what occurs in Light Dependent stage of Photosynthesis

Answer explanation

Attached to thylakoid is a transmembrane protein known as 'ATP Synthase', which takes ADP + Pi and creates 18ATP. Using light energy, it also breaks apart Oxygen atoms from Hydrogen in water molecules, allowing half to pass through ATP Synthase which causes the enzyme to spin and create ATP. These 6 left-over Oxygens are then released into the atmosphere. The other half of the Oxygen molecules are joined onto the NADP+ molecules, forming 12NADPH.

Which of the following is NOT an output of Stage 1 Photosynthesis?

• O2

• ATP

• NADPH2

• C6H12O6

Which of the following is NOT an input of Stage 2 Photosynthesis?

• O2

• C02

• ATP

• NADPH2

Location of Stage 2 Photosynthesis

Describe the process of Light Independent stage of Photosynthesis

Answer explanation

CO2 molecules enter Calvin Cycle and combine with a 5-carbon molecule which then splits into 2x 3-carbon molecules. NADPH donates hydrogen ions and electrons, while ATP molecules break into ADP + Pi to release energy which will facilitate more changes to carbon molecules. These carbons form a 3-carbon molecule and leaves cycle, going on to contribute to Glucose production. Some left over oygen molecules combine with hydrogen ions from NADPH to create water.