photosynthesis : ) Flashcards
what biological processes do plants require energy for ?
- photosynthesis
- active transport
- DNA replication
- proteinsynthesis
- cell division
which biological processes do animals require energy for?
- cell division
- protein synthesis
- DNA replication.
- active transport.
- muscle contraction
- thermoregulation
what is a coenzyme?
an organic molecule that takes part in reactions + is changed by them. They usually work by transferring a chemical group from one molecule to another.
which coenzyme is involved in photosynthesis?
NADP
NADP transfers Hydrogen from one molecule to another.
its reduced in LDR and oxidised in LIDR
which coenzyme is involved in respiration?
NAD
FAD
Coenzyme A
what is a light harvesting system
accessory pigments that surround the reaction centers + the harvest + transfer light to them to boost the energy available for photoexcitation.
what are the 2 types of p. pigment?
primary pigments like chlorophyll a accessory pigments (ie chlorophyll b, xanthophylls, carotenoids)
what do accessory pigments do?
absorb light at wavelengths that primary pigments cannot , it then convert them + send them to reaction center
why do most plants appear green?
most plants have ALOT of chlorophyll a and thus reflect ALOT of green pigment. They absorb all the other colours.
what happens when a pigment absorbs light?
- it will appear black.
why do some plants fluoresce?
- if too much light is absorbed.
- plants release excess energy by emitting light as a longer wavelength –> fluorecent light
what is the wavelength of chlorophyll a in PS2 and PS1 ?
PS2 –> 682
PS1 –> 700
what does an absorption spectrum show?
- the % of light absorbed by pigments from each wavelength of light.
what does an action spectrum show?
- the rate of photosynthesis for each wavelength of light. The rate will NOT be the same at every wavelength.
what is the role of different pigments in the photosynthetic process?
- different pigments absorb different wavelengths of light in the antenna complex which is the light harvesting photosystem
- energy is then passed on to chlorophyll a in the reaction center.
where does the light dependant reaction occur?
the grana
what does the LDR produce?
ATP
NADPH
where does the light independent reaction occur?
the stroma
what does the LIDR produce?
glucose (using products of the LDR)
what is non cyclic photophosphorylation?
p. synth that involves both PS2 and PS1.
what are the products of non cyclic PP
ATP
NADPH
what is the 1st electron donor in non cyclic PP
water (ie photolysis)
which photosystems are involved in Non cyclic PP?
PS2 and PS1
what is the last electron acceptor in non cyclic pp
NADP