This figure shows a cross section of a vertebra and the spinal cord. What structure does number 1 indicate? 
A. Central canal
B. Epidural space
C. Dura mater
D. Pia mater
E. Subarachnoid space
Answer: B
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An immature female chicken is a/an ________
Fill in the blank(s) with correct word
In immunodeficiency diseases,
A. the immune system fails to distinguish between self-antigens and foreign antigens. B. inadequate B and/or T cell formation may occur. C. IgE mediates a localized reaction. D. serum sickness results. E. immune surveillance occurs.
Because of the presence of tight junctions, passage of materials across an epithelial barrier must take place between the cells, not through them
Indicate whether the statement is true or false
A red blood cell has a diameter of about 8?m. Use that information to estimate the diameter of the oocyte in micrometers (?m) and millimeters (mm). (1 mm = 1000 ?m)
A) An oocyte has a diameter about 2 times greater than the red blood cell. B) An oocyte has a diameter about 4 times greater than the red blood cell. C) An oocyte has a diameter about 7 times greater than the red blood cell. D) An oocyte has a diameter about 11 times greater than the red blood cell. E) An oocyte has a diameter about 15 times greater than the red blood cell.