Adaptive radiation is best described as the
A. existence of groups of closely related species recently evolved from a common ancestor.
B. existence of groups of distantly related species recently evolved from a common ancestor.
C. existence of groups of closely related species recently evolved from different ancestors through hybridization.
D. existence of individuals of closely related species that originated in different areas within diverse habitats, but that have rejoined as a single species.
A. existence of groups of closely related species recently evolved from a common ancestor.
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Scientists attempted for many years to conduct nuclear transplants but failed. However, geneticists had success in cloning a sheep. They were successful because they
A. picked a cell very early in development. B. replicated the blastomeres before insertion. C. delayed transcription in the blastomeres. D. treated the nucleus with sheep plasma before nuclear insertion. E. utilized a new micro pipette technique.
Each gene mutates at a characteristic frequency
Indicate whether this statement is true or false.
The complement pathway that is activated by binding of C3b to cell surfaces is the
A. classical pathway. B. alternate pathway. C. C3 pathway. D. mucociliary pathway.
Plant cuticles, which reduce water loss, are primarily made of:
a. steroids b. triglycerides c. oils d. waxes e. fats