Exam Questions Flashcards
What is the area in which hydrogen ions build up inside a chloroplast?
-thylakoid
Describe the difference between photosynthesis and respiration
-PS
-produces glucose
-takes place in plants
-uses light energy
-RP
-uses glucose
-takes place in all organisms
-uses chemical energy
Describe the difference between LDR and LIR
-LDR
-requires light
-occurs on thylakoid membrane
-produces NADPH
-LIR
-doesn’t require light
-occurs in stroma
-uses NADPH
Describe the difference between cyclic and non-cyclic phosphorylation
-C
-electrons end up back at their starting point
-makes ATP
-NC
-electrons follow the Z scheme
-makes ATP and NADPH
Explain how light intensity affects the rate of photosynthesis in isolated chloroplasts
-as light increase - rate of PS increases
-more light = more e- excitation
-more electrons reduce NADP
-light becomes a limiting factor at low levels
-other factors become limiting at high light intensity
State the advantage to the plant of having a range of accessory pigment in photosystems
-to be able to absorb a range of wavelengths
Name 2 polysaccharides that can be synthesised from the end products of LIR
-starch
-cellulose
Describe 2 ways in which granuum is adapted to its function
-stacked thylakoids = large SA for light absorption
-contains photosystems
Explain why the theoretical rate of photosynthesis is not achieved at higher light intensities
-temp increases and becomes a limiting factor as it involves enzymes
-light then becomes a limiting factor
Discuss why measuring CO2 uptake may or may not give a better indication of photosynthetic activity than measuring O2 production
-oxygen is only produced in one stage
-O2 could be an underestimate
Name the products of the LDR
-ATP
-NADPH
-oxygen
Paraquat binds with e- in PSI, suggest how is results in the death of a plant
-prevents photophosphorlyation
-therefore no NADPH is produced
Suggest the role of DNA and ribosomes in a chloroplast
-protein for acceptors
-ATP synthase
