The process of cleavage initially produces a
a. zygote.
b. morula.
c. gastrula.
d. puff.
e. third germ layer.
B
Biology & Microbiology
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A nonliving acellular structure that contains DNA is a
A. nucleus. B. virus. C. protein. D. cell wall.
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Which of the following physiological responses occurs in the human body when it becomes overheated?
A) slowing of the heart rate B) constriction of blood vessels in the skin C) increased blood flow to the skin D) retention of water
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A genetic abnormality such as down syndrome can be diagnosed by using the cells obtained during amniocentesis to create a
A. karyotype B. therapeutic gene C. DNA fingerprint D. recombinant vector
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