The mechanism for concentration of urine is called the ________ mechanism.
A. secretion
B. reabsorption
C. concentration
D. countercurrent
E. filtration
Answer: D
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Looking at a slide of thin skin under the microscope, you note that the stratum basale is the __________ layer of the epidermis in from the surface.
A. second B. third C. first D. fifth E. fourth
All but one of the following statements describes the necessity of the blood testis barrier. Select the one statement that does not describe a necessity of the blood testis barrier
A) Spermatogenesis produces new combinations of genes and chromosomes that results in unique antigens that the immune system may see as foreign. B) Spermatocytes undergo meiosis only during puberty, well after the immune system has come to recognize "self" from "non-self" cells. C) Sperm can only be produced at temperatures lower than body temperature. Inflammation in the testis could raise the temperature too high to produce sperm. D) Foreign antigens produced by the newly formed sperm could initiate an autoimmune response against the developing sperm.
The mutation that leads to sickle cell anemia is located on chromosome ________.
A. 21 B. 11 C. 14 D. 3
Vaccinations involve exposure to an antigen to elicit:
A) passive immunity. B) a primary immune response. C) a secondary immune response. D) severe allergic reaction.