Which of the following statements about the Bacteria and Eukarya domains is TRUE?
A) Only members of Eukarya have the ability to grow and reproduce.
B) All members of Bacteria are prokaryotic cells and all members of Eukarya are eukaryotic cells.
C) All members of Bacteria are single-celled and all members of Eukarya are multicellular.
D) All members of Bacteria acquire nutrients via ingestion and all members of Eukarya acquire nutrients by photosynthesis.
B
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The proportion of the air we breathe accounted for by oxygen is approximately
A. 21%. B. 1%. C. 5%. D. 50%. E. 78%.
In dry shrublands, ____
a. plants are adapted to episodes of fire b. primary production is abundant throughout the year c. there are constant cool temperatures throughout the year d. winters are mild and summers are wet e. precipitation occurs evenly year round
Intrinsic pacemaker cells are located in the ____
a. Purkinje fibers b. Bundle branches c. AV node d. SA node e. gap junctions
If natural selection is real, why do lethal recessive disorders still exist in populations?
A. Recessive disorders most frequently do not manifest until later in life, after the individual has reproduced. B. Recessive alleles remain hidden in carriers who are not affected by the disorder. C. There may be an advantage to individuals who are heterozygous. D. Recessive disorders most frequently do not manifest until later in life, after the individual has reproduced; and recessive alleles remain hidden in carriers who are not affected by the disorder. E. Recessive alleles remain hidden in carriers who are not affected by the disorder; and there may be an advantage to individuals who are heterozygous.