Bio Sem 1 Unit 3 - Cellular Respiration + Photosynthesis

Question 1

Photosynthesis formula

Answer 1

6CO2 + 6H2O - (chlorophyll + sunlight)> C6H12O6 + 6O2

Carbon Dioxide + Water –> Glucose + Oxygen + Water

Question 2

Light - Dependent Stage

Answer 2

Occurs at the thylakoid membrane/thylakoid/grana

Inputs = H2O, NADP+, ADP + P
Outputs = O2, NADPH, ATP

Question 3

Light Independent Stage

Answer 3

Occurs in the stroma

Inputs = CO2, NADPH, ATP
Outputs = Glucose (C6H12O6), H2O , NADP+, ADP + Pi

Question 4

Rubisco

Answer 4

• Catalyst in the first step of photosynthesis
• Binds Carbon Dioxide and attaches it to a sugar molecule

Question 5

C3 Plants

Answer 5

• No adaptations to limit
  photorespiration
• Carbon dioxide is fixed directly from
  the air.
• C3 plants are at a disadvantage when
  the weather is hot and dry as Rubisco
  will be picking up more oxygen.

Question 6

C4 Plants

Answer 6

• Carbon is fixed in the mesophyll and
  The Calvin cycle is completed in a
  different cell (bundle sheath).
• The initial carbon fixation and the rest
  of the light-independent reaction are
  separated over space.
• Mesophyll cells constantly pump CO2
  into the bundle sheath cells keeping
  the concentration high and lowering
  the chance Rubisco will pick up O2
  instead. But this costs additional ATP.
• C4 plants can maintain high rates of
  photosynthesis and low rates of
  photorespiration at high
  temperatures.