The nucleus of a cell
A) is surrounded by a single layer of membrane.
B) is contained within the nucleolus.
C) contains DNA.
D) is the primary location of protein synthesis.
Answer: C
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De Queiroz's general species concept is receiving significant support because
A. it includes morphology, reproductive isolation, DNA sequences and ecology to determine if a population of group of populations is distinct form other groups. B. multiple criteria are used. C. many scientists believe it is not valid to have so many different species concepts. D. it concurs with evolutionary lineage concept. E. all of the above are correct.
A hydrogen bond is an attraction between a(n) ____ hydrogen atom and another hydrogen atom taking part in ____
a. covalently bonded; the same polar covalent bond b. ionically bonded; the same polar covalent bond c. covalently bonded; a separate polar covalent bond d. ionically bonded; a separate nonpolar covalent bond e. nonpolar covalently bonded; a separate nonpolar covalent bond
In nonrandom mating each individual in a population has an equal chance of mating with any
individual of the opposite sex.. _________ Indicate whether the statement is true or false.
Unstable isotopes can be useful
A) catalysts. B) in medical diagnosis. C) in vitamins. D) in the formation of hydrogen bonds. E) as buffers.