21. Which of the following does not produce oxygen as a product of photosynthesis?

A. Oak trees
B. Purple sulfur bacteria
C. Cyanobacteria
D. Phytoplankton

22. When acetate is the sole source of carbon for some microorganisms, the cycle which is used, is called

A. pentose phosphate pathway
B. glycolytic pathway
C. glyoxylate pathway
D. oxaloacetate pathway

23. Hexose monophosphate pathway is also known as

A. phosphogluconate pathway
B. oxaloacetate pathway
C. malate pathway
D. fumarate pathway

24. If radioactive bicarbonate was supplied to bacterial cells, which were actively synthesizing fatty acids, it is expected to find the bulk of the radioactivity in

A. cellular bicarbonate
B. the fatty acids
C. the cytoplasmic membrane
D. nucleic acids

25. Standard free energy change (ΔG) can be expressed as

A. ΔG° = -RTlnk_eq
B. ΔG° = RTlnk_eq
C. ΔG° = R/Tlnk_eq
D. ΔG° = -RT/lnk_eq