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 fewest unique mutations, representing the original and oldest DNA sequences.

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


Answer: D. Africa

Biology & Microbiology

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An inversion heterozygote contains

A. two homologous chromosomes with inversions. B. two normal chromosomes. C. one normal chromosome and one chromosome with an inversion D. None of the answers are correct

Biology & Microbiology

Life is thought to have evolved from complex molecules formed by the interaction of smaller molecules in oceans and the atmosphere. The substance which brought these molecules together to interact is

A. buffers. B. acids. C. water. D. salts. E. hydrogen.

Biology & Microbiology

The smallest animals are ectotherms

Indicate whether the statement is true or false

Biology & Microbiology

The evolution of ________ caused the death of many anaerobic organisms, and in their place evolved new aerobic organisms

Fill in the blank(s) with correct word

Biology & Microbiology