Which of the following is true?
A) Both embryonic and adult stem cells are usually pluripotent.
B) Both embryonic and adult stem cells are usually multipotent.
C) Embryonic stem cells are usually pluripotent, but adult stem cells are usually multipotent.
D) Embryonic stem cells are usually multipotent, but adult stem cells are usually pluripotent.
C
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Which has a lower frequency than that of visible light?
A. Radio wave. B. Infrared wave. C. Microwave. D. all of the above
Most extinction is ________
A) gradual, generally occurring when species cannot adapt genetically to changes in environmental conditions B) not often a problem for endemics C) the result of environmental catastrophe D) problematic for generalists E) the result of slow climate change
Of the following, which has the lowest density?
A) thermosphere B) stratosphere C) troposphere D) mesosphere E) stratopause
How many amino acids have basic side chains?
A) 1 B) 2 C) 3 D) 4