The enzymes for synthesis of organic molecules, in autotrophic bacteria, are located:
1. on chloroplast membranes
2. in the cytosol
3. in the nucleoid region
4. along the inner surface of the plasma membrane

Oxygen, during oxygenic photosynthesis, is produced during:
1. cyclic photophosphorylation
2. the light-dependent reactions involving photosystems I and II
3. Calvin cycle
4. the Krebs cycle

The ions comprising the Oxygen Evolving Complex associated with PS II are:

In oxygenic photosynthesis, the release of oxygen is a byproduct of:
1. chemiosmosis
2. reducing ${\mathrm{NADP}}^{+}$ by FNR
3. splitting the water molecules
4. cyclic photophosphorylation

The greatest problem with photorespiration is faced by:

The net reaction of all light-dependent reactions in oxygenic photosynthesis is:

The higher the energy in photons, 
1. the longer their wavelengths
2. the shorter their wavelengths
3. the lesser will be the rate of photosynthesis
4. the larger will be the photorespiratory loss

The diagram shows the famous Engelmann experiment that helped us understand important aspects of the process of photosynthesis. What conclusion can be drawn by the pattern of accumulation of aerobic bacteria shown in the diagram?
 

The electrons excited to higher energy levels during photosynthesis belong to:

The source of hydrogen most probably used by the earliest photosynthesizers was:
1. Hydrogen sulfide
2. Water
3. Methane
4. Glucose