Why are archaea and bacteria—both collections of prokaryotic organisms—grouped into different domains while organisms like fungi and animals are in the same domain?
a. Bacteria and archaea differ significantly in their intracellular organization and structure, but fungi and animals have similar intracellular structure.
b. The DNA sequences of bacteria and archaea are more different than animals and fungi.
c. Fungi and animals look much more similar than bacteria and archaea.
d. Bacteria and archaea differ significantly in their rRNA sequences, but fungi and animals share some rRNA characteristics.
Ans: d. Bacteria and archaea differ significantly in their rRNA sequences, but fungi and animals share some rRNA characteristics.
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An individual who has an XXY combination of sex chromosomes is said to have
A) Klinefelter syndrome. B) Turner syndrome. C) Down syndrome. D) Fragile X syndrome. E) cri du chat syndrome.
All of the following are characteristic of the Platyhelminthes EXCEPT that they
A) are hermaphroditic. B) are dorsoventrally flattened. C) have highly developed digestive and nervous systems. D) can be divided into flukes and tapeworms. E) are multicellular animals.
Which of the following is a reason for metabolic regulation?
A. Ensure efficient use of energy stores B. Maintain cell components at appropriate levels C. Conserve materials D. All of the choices are correct.
Which of the following North American biomes has been almost completely destroyed by agricultural use?
A) Northern coniferous forest B) Tundra C) Temperate deciduous forest D) Grassland E) Desert