The reactions of the Krebs cycle
A. take place in the cytosol of human cells.
B. generate ATP directly by substrate-level phosphorylation.
C. take place only when no oxygen is present.
D. are important for the metabolism of carbohydrates but not other molecules.
E. produce pyruvate and lactate as end products.
Answer: B
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Which of the following statements regarding action potentials generated in a neuronal membrane is FALSE?
A. An action potential generated by a threshold stimulus is the same size as one generated by a supra-threshold stimulus. B. An action potential generates a new action potential in an adjacent area of membrane. C. An action potential generates a local current that depolarizes adjacent membrane to threshold potential. D. Action potentials are usually initiated at the axon hillock of a neuron. E. Action potentials travel in both directions along the axon.
The yellow marrow that fills the medullary cavities of many bones is dominated by ________.
A) adipocytes B) immature red blood cells C) stem cells D) mature red blood cells E) osteocytes
The annulus fibrosis of the intervertebral disc is an example of ____.
a) elastic cartilage b) fibrocartilage c) irregular fibrous CT d) regular fibrous CT
Peyer patches are lymphatic nodules found in the
A. lymph nodes. B. spleen and tonsils. C. appendix and tonsils. D. small intestine and appendix.