Embryonic stem cells are pluripotent, able to ____
a. divide an unlimited amount of times
b. give rise to most, but not all body cell types
c. give rise to any of the body cell types
d. divide a limited amount of times
e. give rise to different, unique individuals
ANSWER: c
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Heritability of a trait can change because
A) genes mutate. B) the environment can change. C) a person can consciously change her or his heritability. D) the heritability in a family changes with the number of children.
Which researcher in 1761 noted unusual tumors of the nose in snuff users and suggested tobacco as the causative agent?
A. John Hill B. Sir Percivall Pott C. Katsusaburo Yamagiwa D. Ernst Winder E. Richard Doll
Bacteria perform each of the following ecological roles. Which role typically does NOT involve symbiosis?
A) skin commensalist B) decomposer C) aggregates with methane-consuming archaea D) gut mutualist
Living systems
A) violate the first law of thermodynamics. B) violate the second law of thermodynamics. C) decrease their entropy while increasing the entropy of the universe. D) are examples of a closed system.