Biochen exam 3

Question 1

Cristae =

Answer 1

convolutions in the inner membrane of the mitochondrion

Question 2

Fumarase

Answer 2

catalyzes the reversible hydration of fumarate to L-malate

Question 3

Flavoproteins

Answer 3

contain a very tightly, sometimes covalently, bound flavin nucleotide (FMN or FAD)

Question 4

Mitophagy

Answer 4

the breakdown of mitochondria and recycling of the amino acids, nucleotides, and lipids

Question 5

what are the three types of electron transfers in oxidative phosphoralation?

Answer 5

Direct transfer of electrons
Transfer as a hydrogen atom (H+ + e−)
Transfer as a hydride ion (:H−)

Question 6

Reducing equivalent

Answer 6

a single electron equivalent transferred in an oxidation-reduction reaction

Question 7

Cytochromes

Answer 7

proteins with characteristic strong absorption of visible light due to their iron-containing heme prosthetic groups

Question 8

How many classes of mitocondria are there

Answer 8

three a ,b,c

Question 9

Which one is covalently bound to molecule

Answer 9

c is covalently attached to cystine residues

Question 10

Rieske iron-sulfur proteins =

Answer 10

proteins in which one Fe atom is coordinated to two His residues

Question 11

Iron-sulfur proteins

Answer 11

proteins that contain iron in association with inorganic sulfur atoms and/or with the sulfur atoms of Cys residues in the protein

Question 12

What is the sequence of electron carriers?

Answer 12

NADH → Q → cytochrome b → cytochrome c1 → cytochrome c → cytochrome a → cytochrome a3 → O2

Question 13

Complex IV

Answer 13

from cytochrome c to O2

Question 14

Complex three

Answer 14

ubiquinone to cytochrome c)

Question 15

complex 2

Answer 15

from succinate to ubiquinone)

Question 16

complex 1

Answer 16

from NADH to ubiquinone