The age structure of the United States in 2015
A) has a broad base, suggesting a high birth rate.
B) has a broad base, suggesting a low birth rate.
C) shows that a greater proportion of the population is elderly now than in earlier decades.
D) shows that the United States has not yet gone through a demographic transition.
Answer: C
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Of the 64 triplet combinations in the genetic code, ____________________ code(s) for amino acids and ____________________ code(s) for the signal that ends protein synthesis
Fill in the blank(s) with correct word
The codon UGA specifies
A) a stop signal in the universal genetic code and in human mtDNA. B) the amino acid tryptophan in the universal genetic code and in human mtDNA. C) formyl-methionine in mtDNA. D) a stop signal in the universal genetic code and the amino acid tryptophan in human mtDNA.
Diffusion _____
A) is very rapid over long distances B) requires an expenditure of energy by the cell C) is a passive process in which molecules move from a region of higher concentration to a region of lower concentration D) requires integral proteins in the cell membrane
A microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)
A) obligate aerobe. B) facultative anaerobe. C) aerotolerant anaerobe. D) microaerophile. E) obligate anaerobe.