Mitochondria Flashcards
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Define cristae:
folds in the inner membrane of the mitochondria that allow for maximal surface area for reactions
Cristae are studded with ______including ATP synthase and cytochromes
proteins
______have prismatic cristae (for closer packing)
Astrocytes

Mitochondrial _______ and _______ typically counterbalance each other. Levels of nutrients and other criteria can tip the balance toward either or.
fusion, division
Mitochondria are moved around the cell on _______
microtubules
In ion-transporting cells, many mitochondria are often located _______
near basolateral cell membrane infoldings and provide locally needed ATP
The electron transport chain takes place on the ____________.
inner mitochondrial membrane
Oxidative metabolism of nutrients creates a ________ in the ETC.
proton gradient

Aerobic respiration requires
Oxygen in order to generate ATP. Pyruvate enters the mitochondrion in order to be fully oxidized by the Krebs cycle. The product of this process is energy in the form of ATP, by substrate level phosphorylation, NADH and FADH2.
Which complexes pump protons?
Complex I, III, and IV
Proton gradient is utilized to generate ______.
ATP
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Once protons are in the intermembrane space, they use a _________ to flow back into the matrix
stationary F0 channel
ATP synthase which rotates as it generates ATP from ADP
F1
From F1 ATP exits using ________
VDAC (voltage-dependent anion channel). Pyruvate (nutrients) also enter the cell using VDAC.

Unique phospholipid of the inner mitochondrial membrane that helps ATP transporter line up to face VDAC
Cardiolipin

Proteins have a matrix-targeting sequence (series of AA’s) that is recognized by _________ and ________.
TOM (transport outer membrane), TIM (transport inner membrane)

Imports cholesterol into mitochondria so it can undergo the first step in steroid synthesis
STAR Protein

Steroid cells have mitochondria with _______shaped cristae.
tubular

Maintains intracellular Ca2+homeostasis by transporting Ca2+ from the cell cytosol into the mitochondrial matrix.
Important for shaping Ca2+ signals and the activation of programmed cell death.
MCU (Mitochondria Calcium Uniporter)

Matrix granules are rich in ______.
calcium
Mitochondria have their own ______, ______, and ______ and even synthesize some of their own proteins
DNA, RNA, ribosomes

Mitochondria have [more/fewer] tRNAs than are used by the rest of the cell and follow relaxed pairing rules.
fewer
The genetic code also differs from that found in the rest of the cell.
Mitochondrial genes evolve more rapidly than nuclear genes.
Mitochondrial genes are inherited by a non-Mendelian mechanism known as ___________ from mother.
“cytoplasmic inheritance”

