To form NADH from NAD+, two electrons and a proton are removed from an organic molecule. What term best describes the reaction in which electrons and a proton are removed from an organic molecule?
A. Condensation
B. Reduction
C. Dehydrogenation
D. Decarboxylation
E. Isomerization
C. Dehydrogenation
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All of the following are a form of potential energy that can be used by a cell EXCEPT
A. an electrical/ion gradient. B. NADH. C. ATP. D. concentration gradient. E. nitrogen.
Which biome experiences the dryest and warmest conditions?
a. desert b. tropical rainforest c. chaparral d. temperate deciduous forest e. boreal forest
Which statement about resting potential is true?
A) A resting membrane allows much more sodium than potassium to diffuse across it. B) The concentration of sodium is much higher inside the cell than outside. C) The resting potential exists because of differences in glucose concentration inside and outside the cell. D) The sodium-potassium pump contributes to the resting membrane potential.
When blood sugar is low, ________ from the pancreas stimulates the breakdown of ________ in the liver.
A. insulin; glucagon B. glucagon; glycogen C. insulin; glycogen D. glycogen; glucose E. glucagon; protein