Tubenoses include:
a. pelicans.
b. gulls.
c. terns.
d. albatrosses.
e. puffins.
D
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Which one of the following pairs would be classified as isotopes of each other?
A. H and H+ B. Na+ and Cl- C. C and Si D. 12C and 13C E. H and H+, Na+ and Cl-, C and Si, 12C and 13C
The primary curvatures of the spine serves mainly to
A) accommodation of the thoracic and abdominopelvic viscera. B) aligning the weight of the head over the legs. C) increasing the ability to extend the limbs. D) take weight off of the hips. E) shifting the weight of the trunk to the hips and lower extremities.
What is the major difference between the endosymbiotic relationship theory and the symbiotic relationship theory?
A. In the endosymbiotic relationship theory a archaeon engulfs a bacterium while in the symbiotic relationship theory a archaeon and bacterium unite, joining their plasma membranes. B. In the endosymbiotic relationship theory an archaeon and bacterium unite, joining their plasma membranes while in the symbiotic relationship theory an archaeon engulfs a bacterium. C. The endosymbiotic relationship theory explains the origin of mitochondria and chloroplasts, but not the nucleus; the symbiotic relationship theory explains the origin of mitochondria, chloroplasts and the nucleus. D. The symbiotic relationship theory explains the origin of mitochondria and chloroplasts, but not the nucleus; the endosymbiotic relationship theory explains the origin of mitochondria, chloroplasts and the nucleus.
When comparing the sequences of a homologous gene in four different species, one pair of species shows a 1% difference, whereas the other pair shows a 3% difference. Which pair diverged longer ago from their common ancestor and why?
A. The pair with a 1% difference? a smaller difference (1% instead of 3%) indicates that there has been less time to accumulate mutations. B. The pair with a 1% difference? a smaller difference (1% instead of 3%) indicates that there has been more time to accumulate mutations. C. The pair with a 3% difference? A larger difference (3% instead of 1%) indicates that there has been less time to accumulate mutations. D. The pair with a 3% difference? a larger difference (3% instead of 1%) indicates that there has been more time to accumulate mutations.