Most endocrine glands communicate with their target tissues using ________ signals.
A. frequency-modulated
B. pitch-modulated
C. resonance-modulated
D. amplitude-modulated
Answer: D
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Embryonic stem cells might be used to replace neurons lost in Parkinson's Disease because
A) they are readily available. B) they divide quickly. C) they are young and vigorous. D) they have not yet differentiated. E) they are taken from the brain of the embryo.
The sarcolemma is the
A. cell membrane of a muscle fiber. B. cytoplasm of muscle cells. C. structural and functional unit of the skeletal muscle cell. D. contractile thread that extends the length of the muscle fiber. E. protein strand composed of actin.
The neonatal period extends
A) for the first 24 hours of life. B) for the first month of life. C) until the first birthday. D) for the first six months. E) until breast feeding stops.
Beta-oxidation
A) occurs in the mitochondria and is a series of reactions that break down fatty acids. B) breaks down proteins into two-carbon fragments that can be metabolized by the citric acid cycle. C) yields large amounts of ATP, while requiring coenzyme A, NAD, and FAD. D) occurs during glycolysis and generates NAD and FAD molecules. E) is the final step of the citric acid cycle where hydrogen ions enter the electrons transport system.