Microorganisms were probably restricted to the oceans and subsurface environments until
A) aquatic life brought them onto land.
B) chemoorganotrophy developed.
C) phototrophy evolved.
D) the ozone layer was made.
Answer: D
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A mutation that results in premature termination of translation _____
A) is a silent mutation B) is a nonsense mutation C) usually has no effect on the function of the protein D) is a missense mutation
Hans Spemann and Hilde Mangold conducted pioneering experiments in which they transplanted the dorsal lip of the blastopore in an early gastrula newt to the ventral side of another early gastrula newt. What was the outcome of this experiment?
A. Discovery of Spemann's organizer. B. The development of dorsal structures (neural tube, notochord) on both the dorsal and ventral parts of the gastrula that received the transplant. C. Identification of a morphogenic field in the dorsal lip of the blastopore of an early gastrula. D. Discovery of a group of embryonic cells in the dorsal lip that ultimately produce specific body structures. E. All of the choices are correct.
The speciation of cichlid fishes of the same African crater lake is an example of
a. divergence. b. parapatry. c. gene flow. d. allopatry. e. sympatry.
________'s concept of preparedness suggests that people are biologically prepared by their evolutionary history to acquire fears more eaily than others.
Fill in the blank(s) with the appropriate word(s).