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Mitochondrion: Quiz


Question 1: The human mitochondrial genome is a circular ________ molecule of about 16 kilobases.

Question 2: Further, its DNA shows substantial similarity to bacterial ________.

Question 3: [6] Larger proteins can enter the mitochondrion if a signaling sequence at their N-terminus binds to a large multisubunit protein called ________, which then actively moves them across the membrane.
Translocase of the outer membraneTranslocase of the inner membraneHsp90Cell nucleus

Question 4: [12] In addition, there is a membrane potential across the inner membrane formed by the action of the enzymes of the ________.
MitochondrionElectron transport chainOxidative phosphorylationMetabolism

Question 5: The ability of these bacteria to conduct respiration in host cells that had relied on ________ and fermentation would have provided a considerable evolutionary advantage.
GluconeogenesisCarbohydrate metabolismMetabolismGlycolysis

Question 6: Mitochondrial genes are transcribed as multigenic transcripts, which are cleaved and polyadenylated to yield mature ________.
Messenger RNADNAMorpholinoNon-coding RNA

Question 7: [6] The mitochondria can be found nestled between myofibrils of muscle or wrapped around the sperm ________.

Question 8: This process is efficient, but a small percentage of electrons may prematurely reduce oxygen, forming ________ such as superoxide.
AntioxidantMetabolismReactive oxygen speciesOxidative stress

Question 9: Each pyruvate molecule produced by glycolysis is actively transported across the inner mitochondrial membrane, and into the matrix where it is oxidized and combined with coenzyme A to form CO2, acetyl-CoA, and ________.
GlutathioneAdenosine triphosphateNicotinamide adenine dinucleotideCofactor (biochemistry)

Question 10: The most prominent roles of mitochondria are to produce ATP (i.e., phosphorylation of ADP) through respiration, and to regulate cellular ________.
Amino acidLipid metabolism3-hydroxy-3-methylglutaryl-CoA lyaseMetabolism

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