Tanisha and Tawanda are twins but do not look alike. They are the result of fertilization of
A) one oocyte by two sperm cells.
B) two oocytes by one sperm cell.
C) two oocytes by two sperm cells.
D) one oogonium by one spermatogonium.
C) two oocytes by two sperm cells.
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Even if utilized properly, what is the least effective means of birth control?
A. oral contraceptive B. condom C. foam D. IUD E. implant
All of the following are true of hemoglobin
EXCEPT
a. it is found in the blood of all vertebrates. b. it increases blood's oxygen carrying capacity. c. it is a protein. d. it will reversibly bind oxygen. e. it releases oxygen in regions where oxygen concentration is high
The process of emulsification is crucial to the digestion of
A. bile salts. B. nucleic acids. C. carbohydrates. D. lipids. E. proteins.
The neurons that are located in the brain and spinal cord are ____
a. motor neurons b. sensory neurons c. integrator neurons d. interneurons e. glial cells