A species colonizes an island, goes through a phase of exponential growth, and reaches the carrying capacity of the island. At what stage is the growth rate slowest?
A. exponential phase
B. after reaching K
C. approaching K
D. initial colonization
Answer: B
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The point at which DNA synthesis is initiated is called the:
A. origin of replication. B. primer. C. primase. D. start codon. E. replication fork.
Which fossil is the earliest known bird with a beak? a. All of these had beaks
b. Sinosauropteryx c. None of these had a beak. d. Confuciusornis e. Archaeopteryx
Which observations of species distribution across Earth support the theory of common descent?
A) All continents contain nearly identical organisms. B) Each part of Earth contains life forms perfectly designed for that region. C) One can see similarities in organisms that are found in close proximity, but each population has adaptations that suit the organisms to their particular habitat. D) There are very few similarities among life forms on different tropical islands.
The fluid-mosaic model considers the cellular membranes to consist of ________ layer(s) of phospholipid molecules and that the individual phospholipids are able to move about within the structure of the membrane.
A. 1 B. 2 C. 3 D. 4