Question

examine the model for two cellular organelles found in many eukaryotic cells. which molecule(s) could be represented by the circle labeled z that is produced as an output of the mitochondria and required by the chloroplast? select all that apply.

letter z could be carbon dioxide because it is produced in cellular respiration and is a reactant of photosynthesis.

letter z could be a water molecule because it is produced in cellular respiration and is a reactant of photosynthesis.

letter z could be a water molecule because it is produced in photosynthesis and is a reactant of cellular respiration.

letter z could be a glucose molecule because it is produced in photosynthesis and is a reactant of cellular respiration.

letter z could be an oxygen molecule because it is produced in cellular respiration and is a reactant of photosynthesis.

Explanation:

• Carbon dioxide: Cellular respiration (in mitochondria) produces \(CO_2\) as a by - product. Photosynthesis (in chloroplasts) uses \(CO_2\) as a reactant (\(6CO_2+6H_2O

ightarrow C_6H_{12}O_6 + 6O_2\)).

• Water: While water is produced in cellular respiration (\(C_6H_{12}O_6+6O_2

ightarrow6CO_2 + 6H_2O+energy\)), it is not a reactant of photosynthesis in the way the question implies. The reactants of photosynthesis are \(CO_2\) and \(H_2O\), but the water in photosynthesis is mainly taken up from the environment, not from the mitochondria - produced water.

• Glucose: Glucose is produced in photosynthesis (\(6CO_2+6H_2O

ightarrow C_6H_{12}O_6 + 6O_2\)) and used in cellular respiration (\(C_6H_{12}O_6+6O_2
ightarrow6CO_2 + 6H_2O+energy\)), but it is not produced by mitochondria.

• Oxygen: Oxygen is produced in photosynthesis (\(6CO_2+6H_2O

ightarrow C_6H_{12}O_6 + 6O_2\)) and used in cellular respiration (\(C_6H_{12}O_6+6O_2
ightarrow6CO_2 + 6H_2O+energy\)), not the other way around as the question states.

Answer:

Carbon dioxide (because it is produced in cellular respiration (mitochondria) and is a reactant of photosynthesis (chloroplast)).