photosynthesis (lecture 7)

Question 1

where do light reactions occur within the chloroplast

Answer 1

the thylakoid

Question 2

what two stages/processes relate to each other for the process of photosynthesis

Answer 2

light reactions & the calvin cycle

Question 3

what are the primary inputs and outputs of photosynthesis

Answer 3

inputs:
light energy, water (thylakoid)
carbon dioxide (fixed to a 5CM, calvin cycle)
outputs:
oxygen (thylakoid)
3 carbon molecule sugar (calvin cycle)

Question 4

what are the names of the four protein complexes (in order) involved in the electron transport train for the light reactions (stage one) in photosynthesis

Answer 4

photosystem II
cytochrome complex
photosystem I
ATP synthase

Question 5

outline the structure of the chloroplast

Answer 5

the chloroplast has 3 membranes:
inner, outer & thylakoid (big SA)
and 3 compartments:
inter membrane space, stroma (inside inner membrane), thylakoid space (seperate sacks)

Question 6

where is the chlorophyl (light absorber) present within the chloroplast

Answer 6

within the photosystem protein complexes on the electron transport chain on the thylakoid membrain

Question 7

which molecules carry the transduced light energy from the photosystem protein complexes out

Answer 7

electrons (high energy electrons once energised by the chlorophyl)

Question 8

outline the origin of chloroplasts and mitochondria

Answer 8

they both contain DNA, ribosomes, and at least two membranes (chloroplast 3), and are able to make some proteins
this is because originally they were both free living bacteria and not bound within another living cell, but were engulfed by an ancestral eukaryotic cell, now they are too reliant on their host cells to maintain life on their own.