Why is it important to regenerate NAD+ during fermentation?
A. To help maintain the reactions of glycolysis
B. To transfer an electron to the electron transport chain
C. To maintain the levels of pyruvate in a cell
D. To produce alcohol or lactic acid for the cell
Answer: A. To help maintain the reactions of glycolysis
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Which of the following causes a decrease in the PO2 of air as it enters the conducting zone of the lungs?
A) warming of the air B) decreasing alveolar PO2 C) the consumption of oxygen D) humidifying the air E) the increasing PCO2
Which of the following is false about ionizing radiation?
a. X rays. gamma rays. and electron beams are examples b. it damages DNA by creating thymine dimers c. low-level ionizing radiation is used in the food industry d. it is more effective at killing microbes than microwaves
A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 5 B. 9 C. 0 D. 14 E. 7
In the black bread mold Rhizopus stolonifer, the two different mating types yield
a. a gametangium. b. a zygosporangium. c. two diploid cells. d. two haploid cells.