The first organisms on Earth were very small, but now when you look around you see many large organisms. Which is the best explanation for this observation?
A) Evolution tends toward larger and larger organisms.
B) There were many steps necessary to go from small cells to large organisms.
C) Organisms got larger because they needed to use resources more efficiently.
D) The goal of evolution is to produce the largest organisms possible.
Answer: B
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Consider two islands located an equal distance from the mainland (colonization source). One island is large, the other is small. Which island will have a higher rate of change in species composition?
A. the small island B. the large island C. The rate of change in species composition will be the same on both islands. D. Species composition does not change at equilibrium.
What was the control in Arthur Kornberg's in vitro replication experiment described in this chapter?
A. The use of radiolabeled nucleotide triphosphates B. The exclusion of template DNA in one test tube C. Adding perchloric acid D. The use of E. coli proteins
Which type of cell functions to help control immune responses in the skin?
a. melanocytes b. Granstein cells c. keratinocytes d. Langerhans cells e. pigmented cells
What forms the skeleton of invertebrate chordates?
a. the pharynx b. the oral hood c. the notochord d. the neural crest