Analysis of the small subunit rRNAs from all organisms in the three current domains suggests that
A. all modern and extinct organisms on earth arose from a common ancestor.
B. the eukaryotes arose from prokaryotes.
C. the Archaea are more closely related to bacteria than eukaryotes.
D. the prokarytoes, archaea, and eukaryotes are not related.
Answer: A
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According to our text, increasing the share of household income controlled by women changes spending in ways that increase benefits to
A) children. B) men. C) pets. D) businesses.
Which of these is not part of the life cycle of brown algae?
A. meiosis B. multicellular haploid stage C. multicellular diploid stage D. gametes produced by mitosis E. spores produced by mitosis
For what purpose do bacteria use restriction enzymes?
A. They are used in plasmid exchanges to fuse plasmid DNA. B. They are used to restrict important nutrients from leaving the bacterial cell. C. They are used to resist infections by viruses. D. They are used to cut up and recycle mRNA transcripts. E. They are used to attach amino acids to tRNA molecules.
An anaerobic organism lacks the enzymes necessary for using __________ in respiration.
A) carbon dioxide B) water C) superoxide D) oxygen