Which of the following statements about taxonomy is NOT true?
A. Homologous structures are derived from a single structure in the ancestor, although they may be adapted to different uses in the descendent species.
B. Analogous structures are derived from a common ancestral structure to perform the same function.
C. In cladistics, a common ancestor and all its descendents that share one or more derived traits are placed in a single clade.
D. Biochemical data and the fossil record can be used to indicate the length of time since two species diverged from a common ancestor.
Answer: B
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Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
The core of a virus is
a. a protein. b. a sugar. c. a nucleic acid. d. a fat. e. a phosphate.
A _______ is an area where two bones meet and may allow for free movement of limbs.
A. joint B. tendon C. ligaments D. cartilage E. fiber
As a result of the action illustrated in the figure,
a. structural genes are transcribed. b. lactose is broken down. c. the lactose operon is repressed. d. the regulatory gene is inactivated. e. lactose production is enhanced.