What is an important function of mitochondria?
a. converting chemical energy from atp into chemical energy in glucose products
b. converting chemical energy from glucose products into chemical energy in atp
c. converting energy from sunlight into chemical energy in glucose products
d. converting energy from sunlight into chemical energy in atp

The best answer is B.

Chemical energy found in glucose and other nutrients is used by the mitochondria to make ATP.  Mitochondria are commonly referred to as the powerhouses of a cell because they are responsible for making ATP, the cell's main energy carrying molecule.

ATP represents the short - term stored energy of the cell. Cellular respiration is the process of making ATP using chemical energy found in glucose and other nutrients. In mitochondria, this process uses oxygen and produces carbon dioxide as a waste product.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

read more on -

a. the production of carbon dioxide through the process of photosynthesis