Mitochondria Flashcards

1
Q

Label

A
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2
Q

Define cristae:

A

folds in the inner membrane of the mitochondria that allow for maximal surface area for reactions

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3
Q

Cristae are studded with ______including ATP synthase and cytochromes

A

proteins

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4
Q

______have prismatic cristae (for closer packing)

A

Astrocytes

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5
Q

Mitochondrial _______ and _______ typically counterbalance each other. Levels of nutrients and other criteria can tip the balance toward either or.

A

fusion, division

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6
Q

Mitochondria are moved around the cell on _______

A

microtubules

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7
Q

In ion-transporting cells, many mitochondria are often located _______

A

near basolateral cell membrane infoldings and provide locally needed ATP

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8
Q

The electron transport chain takes place on the ____________.

A

inner mitochondrial membrane

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9
Q

Oxidative metabolism of nutrients creates a ________ in the ETC.

A

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.

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10
Q

Which complexes pump protons?

A

Complex I, III, and IV

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11
Q

Proton gradient is utilized to generate ______.

A

ATP

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12
Q

Label

A
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13
Q

Once protons are in the intermembrane space, they use a _________ to flow back into the matrix

A

stationary F0 channel

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14
Q

ATP synthase which rotates as it generates ATP from ADP

A

F1

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15
Q

From F1 ATP exits using ________

A

VDAC (voltage-dependent anion channel). Pyruvate (nutrients) also enter the cell using VDAC.

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16
Q

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

A

Cardiolipin

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17
Q

Proteins have a matrix-targeting sequence (series of AA’s) that is recognized by _________ and ________.

A

TOM (transport outer membrane), TIM (transport inner membrane)

18
Q

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

A

STAR Protein

19
Q

Steroid cells have mitochondria with _______shaped cristae.

20
Q

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.

A

MCU (Mitochondria Calcium Uniporter)

21
Q

Matrix granules are rich in ______.

22
Q

Mitochondria have their own ______, ______, and ______ and even synthesize some of their own proteins

A

DNA, RNA, ribosomes

23
Q

Mitochondria have [more/fewer] tRNAs than are used by the rest of the cell and follow relaxed pairing rules.

A

fewer

The genetic code also differs from that found in the rest of the cell.

24
Q

Mitochondrial genes evolve more rapidly than nuclear genes.

Mitochondrial genes are inherited by a non-Mendelian mechanism known as ___________ from mother.

A

“cytoplasmic inheritance”

25
Mitochondrial numbers within a cell vary depending upon ______ and \_\_\_\_\_\_.
energy production, energy needs
26
When intracellular ATP becomes depleted, cells respond by:
* Metabolizing glycogen * Increasing glucose uptake * Increasing mitochondrial number and activity to produce more ATP
27
AMP-Activated Protein Kinase (AMPK) activated by:
* Increase in the AMP/ATP ratio * Starvation (fuel deficiency) * Increased phosphocreatine AMPK function as a **fuel senor** for the cell
28
Activated AMPK alters the \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_and the
function of many proteins, transcription of many genes
29
Regulate the transcription of many mitochondrial genes
NRF-1 and NRF-2
30
Define apoptosis
Programmed cell death
31
Intrinsic apoptosis pathway:
* Cell damage or stress * Permeability transition pore in the inner mitochondrial membrane opens * Proton gradient dissipation * Swelling of the mitochondrion * Release of several apoptotic factors into the cytoplasm
32
Apoptotic factors released into the cytoplasm:
* Cytochrome C * Apoptosis-inducing factor (AIF) * Procaspases
33
Cytochrome c causes activation of the _____________________ by which other caspases are activated
caspase proteolytic cascade
34
A caspase is a
proteolytic enzyme
35
Cytochrome c activation results in _________ and leads to \_\_\_\_\_\_\_\_\_
massive protein degradation; destruction of the nuclear lumins
36
Apoptosis-inducing factor (AIF) is translocated to the nucleus and \_\_\_\_\_\_\_\_\_\_\_\_\_\_
induces destruction of the chromatin.
37
Amyotrophic Lateral Sclerosis (ALS or Lou Gehrig Disease) is characterized by \_\_\_\_\_\_\_\_\_\_
death of motor neurons of the spinal cord. It is associated with mitochondrial damage in neurons. Relatively rare (2/100,000 in population)
38
Inherited form of ALS involves a misfolded enzyme __________ that may block VDAC
superoxide dismutase (SOD)
39
The flow of H+ ions cause a portion of _______ to rotate and simultaneously generate ATP
ATP synthase
40
AMPK Increase the Transcription of \_\_\_\_\_\_\_\_\_\_\_
Nuclear Respiratory Factor NRF-1 mRNA
41
AMPK is Required for \_\_\_\_\_\_\_\_\_in response to starvation in muscle
mitochondrial biogenesis