Indicate whether each of the following descriptions better applies to the light (L) or dark (D) reactions in plant chloroplasts. Your answer would be a five-letter string composed of letters L and D only, e.g. DDDLD. ( ) It produces the sugar glyceraldehyde 3-phosphate. ( ) It involves the electron-transfer chain embedded in the thylakoid membrane. ( ) It involves O2 production. ( ) It involves fixation of CO2. ( ) It generates ATP.