The element carbon has 6 protons and 6 neutrons in its nucleus. Which of the following represents the carbon-14 isotope?
a. 6 protons, 8 neutrons
b. 6 protons, 7 neutrons
c. 7 protons, 6 neutrons
d. 8 protons, 6 neutrons
Ans: a. 6 protons, 8 neutrons
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Characterize the life cycle of cnidarians.
A. All species have both polyps and medusae. B. Some have only polyps, some have both polyps and medusae, and others have medusae and a reduced polyp stage. C. Some species have only medusae and others have both polyps and medusae. D. Some species have only polyps and others have both polyps and medusae. E. Some species have polyps and others have medusae, but no species has both.
The above figure represents which of the following
chromosomal changes:a. inversion b. deletion c. duplication d. translocation e. aneuploidy
Why is there very little physical evidence of life from rocks of the Archaean eon?
a. Those rocks have been deeply buried in most parts of the world. b. Those rocks occupy inaccessible areas of mountainous regions. c. Those rocks have been greatly eroded in most parts of the world. d. Those rocks occupy the polar regions and are thus covered by glaciers. e. Those rocks have been deposited in oceanic trenches deep in the oceans.
The first hominin species associated with the use of tools was
A) Australopithecus robustus. B) Homo erectus. C) Homo habilis. D) Australopithecus afarensis. E) Homo sapiens.