Arrange the sequence of events for the overall mitochondrial respiratory assembly in the correct order.

1) Coenzyme Q-cytochrome c reductase passes electrons to cytochrome c.

2) Coenzyme Q releases its electrons to complex III.

3) Cytochrome oxidase catalyzes the reduction of O2 to water.

4) Succinate, through complex II, and NADH, via complex I, release electrons to coenzyme Q.

A. 4, 1, 3, 2
B. 4, 3, 1, 2
C. 4, 1, 2, 3
D. 4, 2, 1, 3

Option D, 4,2,1, 3

Explanation:

The mitochondrial respiratory chain (MRC) comprises of four membrane bound complexes and it involves the following steps

a)RC complexes (RCC) I and II reduces the RC’s equivalent where RCCI i.e receives electron from the NADH.  

b)These electrons are then transferred to the flavin mononucleotide factor and then passed on to the Fe-S embedded cluster .

c)These electron reduces the coenzyme Q  to ubiquinol  

d)With in the inner mitochondrial membrane (IMM), protons are trans located from IMM to the  intermembrane space (IMS)

e)RC complex II then transfer electron from succinate to the cofactor FAD

f)From FAD proton are transferred to the FeS cluster and on the other hand electron move from QH2 to the RC complex III

g)This RC complex III give its electrons to the cytochrome and they are further passes on to the RC complex IV

h)With four redox centers, the terminal RC complex translocate protein by using energy produced in electron transfer thereby converting oxygen into water.

Hence, the correct option is D

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

c. heat from the poles back down towards the equator.