The oxygen released in photosynthesis comes from
A. carbon dioxide
B. glucose
C. ribulose biphosphate
D. water
E. atmospheric oxygen
D. water
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The cell walls of fungi are composed of:
A. chitin B. cellulose C. dentine D. peptides E. glycerol
Ricin is
a. a substance found in castor bean seeds. b. a polysaccharide extracted from rice. c. an ingredient in many paints and cosmetics. d. a protein that inactivates ribosomes. e. a substance found in castor bean seeds and a protein that inactivates ribosomes.
Which equation represents photosynthesis?
A) 6CO2 + 6O2 + sunlight ? C6H12O6 + 6H2O B) 6H2O + 6CO2 + sunlight ? C6H12O6 + 6O2 C) C6H12O6 + 6O2 + sunlight ? 6CO2 + 6H2O D) O2 + H2O + sunlight ? C6H12O6 + CO2
A 67-year-old diabetic man develops intense pain and swelling on his calf, which acquires a bronze discoloration and develops significant tissue necrosis with hemorrhagic bullae and gas production (gas gangarene). Which of the following is the important contributing agent?
A. Clostridium perfringens B. Clostridium difficile C. Clostridium botulinum D. Clostridium tetani