metabolism 3 Flashcards
where does the citric acid cycle occur?
mitochondrial matrix
does citric cycle require oxygen?
no but it is considered an aerobic process because it takes place in the presence of oxygen.
the pyruvate enter the?
matrix
in thepresence of nad+, pyruvate
oxidizes to form acetyl coA and produces 1 nadh for each pryvate oxidizing = 2
acetyl coa enters the
citric acid cycle
how many steps in the citric acid cycle?
8 and has 8 enzymes
how many nadh co2 atp and acetyl coa before the citric acid cycle?
4 nadh , 2 co2, 2 atp, and 2 acetyl coA
what was made after the citric acid cycle?
1 atp in step 5, 3 adh in steps 3,4,8, 1 fadh2 in step 6 and 2 co2 in step 3 and 4
how many times does the citric acid cycle go around oe molecule of glucose?
for each molecule of glucose, the citric cycle goes around 2x. so for one molecule of glucose, 2 ATP, 6 NADH, 2 FADH2, AND 4 CO2
has glucose been fully oxidized by this point?
yes
after the citric acid cycle, __ molecules of NADH and ___ molecules of FADH2 have been generated.
6 nadh and 2 fadh2
these molecules are carrying ?
high energy electrons with potential energy
this stored energy is used to drive atp synthesis in the process of?
oxidative phosphorylation
what happens. next?
the electrons are transferred from one electron carrier to another until they combbine with o2 and h to form h20.
where does etc occur?
inner membrane of mitochondria
the process by which atp is made from energy released by the etc is called
oxidative phosphorlyation: the use of redox reaxtions in an etc to produce the energy needed to attach pi to adp to make atp.
the enzyme that makes atp from adp and pi is called
atp synthase
this reaction is endergonic, where does the cell get the energy from?
ion gradient of h+ that exists across the inner mitochondrial membrane
how is the h+ gradient generated
by the etc
when the electrons are transferred from one carrier to the next,
a small amount of energy is released and that is used to pump h+ across the membrane from the matric to the intermembrane space
the electron carriers pick up and release protons when they pick up electrons
yes
the h+ gradient that exists is called the
proton motive force
after movement into the intermembrane space, there
is now an electrochemical difference across the inner membrane
since h+ is an ion, it cannot diffuse across membrane on its own..
it passes through the channel formed by the atp synthase
