Which statement is LEAST characteristic of proteobacteria?
A. They live only inside plants.
B. Some eat other bacteria.
C. Some are chemoheterotrophs.
D. A member of this group gave rise to mitochondria.
E. They are the most diverse group of bacteria.
Answer: A
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Which statement describes a difference between meiosis I and meiosis II?
a. DNA is replicated during meiosis II but not during meiosis I. b. Homologous chromosomes separate during meiosis I; sister chromatids separate during meiosis II. c. Meiosis I produces diploid cells; meiosis II produces haploid cells. d. Chromosomes align along the equatorial plane of the cell in meiosis I but not in meiosis II. e. Crossing-over occurs during meiosis II but not during meiosis I.
Leghemoglobin, which contains an iron-containing heme group, is used to
a. remove O2 from roots. b. produce H2O from O2. c. deliver O2 to bacteroids. d. transport O2 in the xylem. e. produce O2 from H2O.
Is it possible that the carbon atoms in your body may have once made up the living tissues of another person or animal in earlier times? This is
A. impossible since carbon can't enter a living system more than once. B. possible since carbon cycles through the biosphere. C. possible only if you are a cannibal. D. highly unlikely since carbon is always tied up in molecules in organisms or minerals.
In angiosperms, but not conifers, pollen grains can form pollen tubes
Indicate whether the statement is true or false