There is much controversy in the news—both scientific and popular—about the use of embryonic stem cells for research. These cells are grown as cell lines in culture, created by taking the inner cell mass from 5-day-old embryos
What is the center of the controversy? A) the fact that the embryos are mostly those unused by in vitro clinics
B) the knowledge that these cell lines have reverted spinal cord injuries in mice
C) the unproven usefulness of stem cells to treat human disorders
D) the realization that these cells are pluripotent rather than totipotent
E) the difference of opinion about whether these embryos are persons
E
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What percentage of the genome is subject to copy number variation (CNV)?
A. 1-2% B. 10-15% C. 15-20% D. 20-30% E. 50-75%
What region of the 5-week embryo gives rise to the midbrain?
a. telencephalon b. diencephalon c. mesencephalon d. metencephalon e. myelencephalon
What directly supplies the electrons for the electron transfer system?
a. ATP and ADP b. FADH2 and NADH c. pyruvate and acetate d. various enzymes e. oxygen and water
Which of the following characteristics is not a property of cells or living things?
A) All of the choices are not fundamental characteristics of living things B) Responds to stimulus C) Ability to replicate D) Cell boundary E) Nucleus