Which step(s) of the Krebs cycle does (do) not produce any usable energy?
a. The third step
b. The fifth step
c. The sixth step
d. The second and seventh steps
e. The first and eighth steps
Ans: d. The second and seventh steps
Biology & Microbiology
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Polyploid plants are often unhealthy compared to diploid plants
a. True b. False
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Where in an insect tracheal system does gas exchange occur between the air and a cell?
a. trachea b. tracheal branches c. gill filaments d. tracheoles e. spiracles
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An aquifer is most closely related to
a. sea water. b. lake water. c. stream water. d. glacial water. e. groundwater
Biology & Microbiology
The portion of the enzyme that binds with the substrate is the _____.
a) stroma b) active site c) channel d) thylakoid membrane
Biology & Microbiology