Maximum force is generated by a muscle contraction when:
A. the myofibril is stretched.
B. there is excessive overlap between actin
and myosin.
C. the sarcomere is at intermediate length
prior to initiation of contraction.
D. intracellular calcium levels are low.
C
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When Nitrobacter utilizes nitrite produced from ammonia by Nitrosomonas to obtain energy by converting the nitrite to nitrate, the relationship between the two organisms is
A. mutual. B. commensal. C. amensal. D. parasitic.
Which hormone raises blood glucose levels?
A. glucocorticoids B. epinephrine C. insulin D. glucagon E. melatonin
The opossum and kangaroos are examples of living members of which of the following mammalian
lineages?
a. Strepsirhini b. monotremes c. Rodentia d. Haplorhini e. marsupials
Which of the following is not a function of the vertebrate skeleton?
A. support B. movement C. protection of internal structures D. production of blood cells E. distribution of nutrients