Scientists use mitochondrial DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, mitochondrial DNA samples taken from ____ would have the most unique mutations, representing the original and oldest DNA sequences.

A. Africa
B. Asia
C. Australia
D. Europe
E. the Americas


Ans: E. the Americas

Biology & Microbiology

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A pupillary reflex is

(a) somatic. (b) autonomic. (c) both a and b. (d) none of the above.

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The northern boundary of the distribution of Saguaro cacti is defined by

A. areas in which temperatures do not drop below freezing. B. the availability of water year round. C. the presence of pollinating insects. D. proximity to coastal environments. E. the frequency of low-intensity fires.

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If the anticodon sequence of a(n) ____ is correct, a special enzyme will bind to it and "charge" it by

adding the correct amino acid to its 3' end.

a. pre-mRNA b. tRNA c. snRNA d. mRNA e. rRNA

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All surviving hominins belong to the species

A) Homo habilis. B) Homo sapiens. C) Australopithecus robustus. D) Homo robustus. E) Homo erectus.

Biology & Microbiology