Peter Sheldon found that the number of tail “ribs” in ____ changed over a 3 million year period with no evidence of
speciation.
a. horses
b. trilobites
c. insects
d. humans
e. ectoprocts
ANSWER: b
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QTL mapping can rely on the relationship between genes for quantitative traits and which of the following?
A. The centromere B. Transposon sites C. Structural genes D. Molecular markers such as RFLPs
A flower on a plant represents which level of organization?
A. atom. B. cell. C. organ. D. organism. E. population.
Epithelial cell shapes and arrangements include: (check all that apply)
A. rod-shaped. B. columnar. C. transitional. D. symmetric. E. stratified.
Which of the following statements regarding circulatory systems is true?
A) The smallest blood vessels in the body are veins. B) A circulatory system is necessary in any animal whose body is too large or too complex for vital chemicals to reach all parts of the body by diffusion. C) Materials are exchanged directly between the blood and body cells. D) Veins carry blood away from the heart to body organs and tissues.