What do the red muscles of tuna, the optical systems of billfish, and the legs of birds have in common?
A) Higher proportions of glycolytic muscle fibers
B) Brown adipose tissue
C) Countercurrent heat exchangers
D) More than one of the above
Answer: C
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Which of the following cells of the immune system are capable of phagocytosis?A) MacrophagesB) NeutrophilsC) Dendritic cellsD) BasophilsE) T lymphocytes
What will be an ideal response?
The hormone that signals that fertilization and implantation have taken place is
A. pluripotent prolactin. B. human chorionic gonadotropin. C. gonadotropin releasing hormone. D. progesterone. E. pre-embryonic pellucida factor.
Which of the following structures is not part of the external ear?
A) external acoustic meatus B) tympanic membrane C) pharyngotympanic tube D) pinna
One of the nutrients important for the synthesis of DNA and RNA is ________.
A. biotin B. vitamin C C. folic acid D. riboflavin