Which of the following statements is true with respect to myosin?
A) Plants, fungi, and animals share the same myosin families.
B) Myosin is found in all prokaryotes and eukaryotes.
C) Different classes of myosins are distinguished by differences in structural organization and amino acid sequence.
D) Cardiac ?-myosin allows for greater contractile efficiency.
Answer: C
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In transamination, the amino group of an amino acid is
A) converted to ammonia. B) converted to urea. C) transferred to a keto acid. D) absorbed by water. E) transferred to acetyl-CoA.
Transverse foramina are found in ________ vertebrae.
A. cervical B. lumbar C. thoracic D. sacral E. all
Returning the thumb to the anatomical position after touching the little finger is
A. reposition. B. opposition. C. medial excursion. D. supination.
If acetylcholine binds to muscarinic receptors,
A. Na+ channels open. B. Ca2+ channels open. C. adrenaline is released. D. G proteins mediate the cell's response. E. the response is neither excitatory nor inhibitory.