Which statement best reflects the main difference between the genomes of bacteria, archaea, and eukaryotes?
A. Eukaryotes have larger genomes than bacteria and archaea since they are larger cells.
B. Pathogens have larger genomes than non-pathogenic microbes since genome size is generally dependent on the presence of pathogenicity islands.
C. Eukaryotes have a high gene density compared to bacteria and archaea since their genes contain introns.
D. Intracellular parasites have the smallest genomes since they have evolved to lack genes that code for the synthesis of essential metabolites.
Answer: D
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Blood and lymph may carry
A. antibodies. B. complement. C. lysozyme. D. interferon. E. All of the choices are correct.
Which of the following exert bottom-up control?
A. a parasite that resides in a mammal's gut B. a tertiary predator with fluctuating population size C. levels of calcium and nitrogen in the soil D. a disease-carrying protist
Why did the authors choose to look for the rubisco gene in the DNA samples taken from permafrost?
A. It is used in respiration by all plants. B. It is used in photosynthesis by all plants. C. Plant cells do not have a nucleus. D. Plant cells do not have mitochondria. E. It is only present in angiosperms (flowering plants).
Which of the following is not a function of the nuclear division process of mitosis in eukaryotic organisms
1.increase in body size 2.tissue repair in multicelled eukaryotes 3.asexual reproduction 4.sexual reproduction