What is the difference between a primary and a secondary source?
A. A primary source is the raw data before scientists publish, whereas a secondary source is a description of the original material.
B. A primary source is the original material published by the scientists, whereas a secondary source is a description of the original material.
C. A primary source is the original material published by the scientists, whereas a secondary source is the raw data before scientists publish.
D. There is no difference between primary and secondary sources.
Answer: B
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Which of the following statements contrasting simple versus complex multicellularity is true?
A. Complex multicellular organisms show a large degree of cellular differentiation, whereas simple multicellular organisms show little differentiation of specialized cell types. B. Cell or tissue loss in a simple multicellular organism can be lethal for the entire organism, whereas cell or tissue loss in a complex multicellular organism does not lead to death of the entire organism. C. Highly specialized molecular mechanisms allow for adhesion between cells in simple multicellular organisms, but not in complex multicellular organisms. D. Only some cells are in direct contact with the environment in simple multicellular organisms, whereas all cells are in direct contact with the environment in complex multicellular organisms. E. Most or all of the cells in a complex multicellular organism are capable of reproduction, whereas only a subset of cells contributes to reproduction in simple multicellular organisms.
DNA replication is
A) conservative. B) dispersive. C) semiconservative. D) irregular. E) none of the above
Of the following species, which are widely distributed in nature and hospital environments?
a. Pseudomonas luteola b. Acinetobacter spp. c. Pseudomonas oryzihabitans d. Bordetella trematum
Trachea, larynx, bronchioles, bronchi are found where?
a. Left atrium b. Right atrium c. Left ventricle d. Right ventricle