Question

Carbohydrates (glucose) produced by photosynthesis occurring in tony will contain a majority of the 18O isotopes originally found in the labeled CO₂ gas

true or false

Answer 1

It is true that carbohydrates produced by photosynthesis will contain a majority of the 18O isotopes from the labeled CO₂, as the oxygen atoms in the glucose molecule originate from the carbon dioxide used in the process.

Step-by-step explanation:

The statement that carbohydrates (glucose) produced by photosynthesis will contain a majority of the 18O isotopes originally found in the labeled CO₂ is true. During photosynthesis, carbon dioxide and water are converted into glucose and oxygen. The overall chemical equation for photosynthesis is:

6 CO₂ + 6 H₂O + energy → C6H₁₂O₆ + 6 O₂

Here, the carbon atoms from carbon dioxide (CO₂) become part of the glucose molecule (C6H₁₂O₆). If the carbon dioxide used in the process is labeled with the 18O isotope, then the oxygen atoms within the glucose will include those 18O isotopes, as the oxygen atoms in the glucose molecule come from the carbon dioxide.