What is common to all of the oxidation reactions in the Krebs cycle?
A. They all lead to the generation of NADH.
B. They are all decarboxylation reactions.
C. They are all characterized by a loss of electrons from an organic molecule coupled to the reduction of an electron acceptor.
D. They all lead to substrate-level phosphorylation of ADP to generate ATP.
C. They are all characterized by a loss of electrons from an organic molecule coupled to the reduction of an electron acceptor.
While all of the oxidation reactions are characterized by the donation of electrons from an organic molecule to an electron acceptor, they are not all decarboxylation reactions, nor do they all involve the generation of NADH. The third oxidation reaction is not a decarboxylation reaction, and involves the generation of FADH2. None of the oxidation reactions directly induce substrate-level phosphorylation of ADP.
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A human infection that results from a microorganism that primarily infects animal populations is referred to as a(n) _________ infection
a. accidental b. zoonotic c. secondary d. vector
What change does binding of the sperm membrane to the oocyte membrane elicit?
a. The oocyte dispels its nucleus. b. The oocyte begins cleavage. c. The oocyte completes meiosis II. d. The sperm returns back to the oviduct. e. The sperm releases a polar body.
Based on the accompanying figure, the ____ is much more developed in amphibians than in reptiles
a. cerebellum
b. cerebrum
c. optic lobe
d. olfactory tract
e. corpus striatum
The class of antibody known as IgA is
A. Found in the mucous found in the respiratory, intestinal and genito-urinary tracts B. capable of crossing the placenta from mother to fetus C. It is formed of a single unit (monomer) of antibody molecule D. It works only against viruses infecting the upper respiratory tract