Which speeds up the reaction between carbon dioxide and RuBP to restart the Calvin Cycle? light energy rubisco 3-phosphoglycerate glyceraldehyde 3 -phosphate

## Step 1<br />The Calvin Cycle, also known as the light-independent reactions, is a part of photosynthesis that occurs in the stroma of chloroplasts. This cycle involves the conversion of carbon dioxide and other compounds into glucose. The cycle is initiated by the combination of carbon dioxide with a five-carbon sugar called RuBP (Ribulose-1,5-bisphosphate).<br /><br />## Step 2<br />The reaction between carbon dioxide and RuBP is catalyzed by an enzyme called rubisco. Rubisco is the most abundant enzyme on Earth and is responsible for catalyzing the first major step of carbon fixation in the Calvin Cycle.<br /><br />## Step 3<br />Light energy, while crucial for photosynthesis, is not directly involved in the reaction between carbon dioxide and RuBP. It is used in the light-dependent reactions to produce ATP and NADPH, which are then used in the Calvin Cycle.<br /><br />## Step 4<br />3-phosphoglycerate and glyceraldehyde 3-phosphate are intermediates in the Calvin Cycle. They are products of the reactions catalyzed by rubisco, not catalysts themselves.