The attachment point of a muscle to a bone that can move is called the ________
A) synergistic B) origin C) antagonistic D) insertion
Answer: D
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Suppose a human metabolic disease only allows electrons to be used from NADH and not FADH2. What is a
probable cause of this disease?
a. a defect in assembly protein genes for complex II of the electron transfer system b. enzyme defects in glycolysis and the citric acid cycle c. a deficient amount of cytochrome c and coenzyme Q d. improper regulation of phosphofructokinase e. inability of oxygen to act as a final electron acceptor
Tamryn has a son who has Duchenne muscular dystrophy, which is inherited as an X-linked recessive trait. At a molecular level, the disease is due to lack of the protein dystrophin. Tamryn participates in a study that looks at dystrophin levels in various muscles. The study samples cells from 10 different muscles. The study finds that some cells make dystrophin and some do not. An explanation for this finding is that
A) the mutation is only in some muscle cells. B) Tamryn is making less dystrophin as she gets older. The study should be repeated at different ages. C) the X chromosome that bears the mutation is turned on in some cells but off in others. D) Tamryn does not have a Y chromosome.
A water-vascular system is unique to the:
a. arthropods b. annelids c. chordates d. mollusks e. echinoderms
Blood from the ____________________ returns to the heart through the pulmonary veins. Fill in the blank(s) with the appropriate word(s)