You Are Evaluating Novel Varieties of C₃ Rice That Express

Multiple Choice

You are evaluating novel varieties of C₃ rice that express PEP carboxylase and rubisco in both mesophyll and bundle-sheath cells for a project to develop rice plants that are capable of C₄ photosynthesis. Your MOST promising candidates are those for which the enzyme levels of:

A) both enzymes are higher in bundle-sheath cells than in mesophyll cells.
B) PEP carboxylase levels are higher in mesophyll cells than in bundle-sheath cells.
C) rubisco levels are lower in bundle-sheath cells than in mesophyll cells.
D) both enzymes are highly expressed in both cell types.