Which of the following adult structures is not derived from the same primary germ layer
as the others?
A) Blood vessels B) Muscles
C) Bones D) Nerves
D
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In males, the labioscrotal swellings form the
A. scrotum and root of the penis. B. scrotum and testes. C. scrotum and dorsal side of the penis. D. scrotum and ventral side of the penis. E. scrotum.
If a cell lacked the enzyme DNA polymerase, it could not
A) maintain the integrity of the nuclear envelope. B) form complementary strands of DNA during replication. C) link segments of DNA together. D) form spindle fibers. E) form a new nuclear membrane during telophase.
The posterior pituitary hormone that is crucial for milk ejection is
A. LH. B. GnRH. C. oxytocin. D. prolactin. E. progesterone.
Which structure ultimately regulates the passage of materials from the blood into the cerebrospinal fluid and the brain?
A. Pia mater B. Dura mater C. Arachnoid mater D. Meninges E. Blood-brain-barrier F. Cranium