Photosynthesis AQA A level Biology

What is the term used when light energy excites electrons from the pigment such as chlorophyll found in chloroplasts

• Photoneogenesis

• Photoionisation

• Photolysis

• Photophosphorylation

Tags

NGSS.HS-LS1-5

State the location of the light dependent reaction in photosynthesis

• Stroma of the chloroplast

• Inner membrane of the chloroplast

• Thylakoid membranes of the grana.

• Matrix

• Cristae

State the products of the light dependent reaction of photosynthesis.

• Oxygen, ATP and NAD

• Water, ATP and NADPH

• FADH₂, NADH, ATP and CO₂

• Oxygen, ATP and NADPH

• Water, ATP, NADH and CO₂

Photolysis of water can be represented as?

• H₂O --> H⁺ + 4e^- + O₂

• H₂O --> H⁺ + e^- + O₂

• H₂O --> 4H⁺ + 4e^- + O₂

• 2H₂O --> 4H⁺ + 4e^- + O₂

Tags

NGSS.HS-PS1-2

During the light dependent reaction of photosynthesis what does the movement of electrons through the thylakoid membranes provide energy for ?

• To pump hydrogen ions (protons) into the intermembrane space, which builds up an electrochemical gradient.

• To pump NADPH into the intermembrane space, which builds up an electrochemical gradient.

• To pump OH ions into the intermembrane space, which builds up an electrochemical gradient.

• To pump NADP into the intermembrane space, which builds up and electrochemical gradient.

Tags

NGSS.HS-LS1-5

How is ATP generated during the light dependent stage of photosynthesis

• NADP combine with hydrogen ions which are then pumped across the thylakoid membrane using energy from light. Chlorophyll is then excited to produce electrons which then oxidise NADPH to produce Hydrogen gas which then combines with oxygen to produce water. Energy from this process produces ATP by ATP synthase which generates ATP from ADP and Pⁱ

• Hydrogen ions from the photolysis of water are pumped across the thylakoid membranes into the intermembrane space using the energy from the movement of electrons through the electron transfer chain. This builds up an electrochemical gradient. The hydrogen ions move by chemiosmosis through ATP synthase which generates ATP from ADP and Pⁱ

• Water is split to produce hydrogen ions which immediately combine with NADP to produce NADPH in the Chlorophyll. The movement of hydrogen ions through the membrane creates energy. Energy from this process produces ATP by ATP synthase which generates ATP from ADP and Pⁱ

• Photoionisation of water causes it to split the chlorophyll. Electrons are released to then produce produce hydrogen ions This releases energy. Energy created from this process produces ATP by ATP synthase which generates ATP from ADP and Pⁱ

Tags

NGSS.HS-LS1-5

State the location of the light independent stage of photosynthesis

• Thylakoid membranes of the chloroplast

• Cristae

• Matrix

• Stroma of the chloroplast

• Grana

State the name of the 5 carbon compound found in the Calvin cycle

• RuBS

• Ribulose Bisphosphate

• Ribulose Diphosphate

• RuBD

• Rubisco

State the name of the enzyme which combines Carbon dioxide with the 5 carbon sugar in the Calvin Cycle

• Rubisco

• Ribulose bisphosphate

• RuBP

• Ribulose diphosphate

• RuDP

Once carbon is fixed in the Calvin cycle the six carbon compound immediately splits into what molecules?

• One molecule of glycerate 6-phosphate

• Two molecules of gylcerate 3-phosphate

• One molecule of triose phosphate

• Three molecules of triose 2-phosphate

• Two molecules of triose 6-phosphate