chapter 2 Flashcards
enzymes
biological catalyst
are proteins, denaturation
enzyme functions
speed up the rate of a biochemical reaction by lowering the energy of activation
they are specific (will catalyze specific reactions)
energy
the capacity to do work. it cant be created or destroyed it can only change its form
metabolism
a process where energy is generated & expanded
two types of metabolic process
catabolism & anabolism
catabolism
degradative (breaks down)
anabolism
synthetic (breaks up)
reactants (substrates)
substances that enter the reactions
intermediates
compounds formed between the start & end of a pathway
products
substances present at the end of a pathway
photosynthesis
a process where carbon dioxide & water make sugar (anabolic reaction)
where does photosynthesis occur?
thylakoid membrane which are found in the chloroplasts
3 stages of photosynthesis
capturing of energy from sunlight
using sunlight energy to make atp & nadph
using atp & nadph to convert CO2 into glucose
2 phases of photosynthesis
light dependent reactions
during this phase, light energy is converted into atp & water is split to release O2
requirements for photosynthesis
sunlight, water, adp, nadp+, chlorophyll, electron acceptors
photolysis
using sunlight to break down water
light dependent reactions
cO2 is converted to glucose
requirements- atp, nadph, co2, RUBP (5 carbon molecule)
light independent reactions
press or convert co2 into glucose
adp & nadp+ are regenerated to be used in the light dependent reaction & the cycle begins again
two types of cellular respiration
anaerobic
aerobic
anaerobic
occurs in the absence of oxygen
aerobic
occurs in the presence of oxygen
when does the cell need energy?
based on levels on atp
when levels of atp are high….
cellular respiration is low
when levels of adp are high….
cellular respiration is moderate
when levels of amp are high….
cellular respiration is high
where does cellular respiration occur?
mitochondria
structure - double membrate structure (cytoplasm)
aerobic respiration
C6H12O6+6O2—>6CO2+^H2O+38 moles of ATP
(beginning products of photosynthesis)
cellular respiration takes place in 4 stages
glycolysis, transitional phase, kreb cycle & electron transport chain
glycolysis
takes place in the cytoplasm of cell. converts glucose to pyruvate
transitional phase
takes place in the cytoplasm. converts pyruvate to acetyl CoA
kreb cycle
takes place in the matrix of the mitochondria. converts acetyl CoA to nadh & fadh2 (energy yielding compounds)
energy transport chain
found on the inner mitochondria membrane converts nadh & fadh2 to atp
conversion rate
1 nadh- 3 atp’s
1 fadh2= 2 atp’s
glycolysis
- divided into 2 phases: preparatory & pay-off
-glycolysis means splitting of sugar
-cells mist invest two atp molecules in this process
end products : 2nadph, 4 atp, 2 pyruvate, -2 atp
transition phase
pyruvate is converted to acetyl CoA
end products: 2 acetyl CoA +2 CO2 +2NADH
kreb cycle
acetyle CoA is converted to NADH & FADH2
end products:6 NADH 2 atp 2fadh2
electron transport chain
the nadh’s & fadh2’s made in the kreb cycle are now converted to atp
plasma membrane
permits the flow of molecules across the membrane & contains receptors that can affect the cells activities
nucleus or nucleus region
all cells have a region that localized the DNA which can be copied, read & passed onto offspring
cytoplasm
all cells have a cytoplasm that contains membrane systems, particles, filaments & a semi-fluid substance