In female mammals, most genes on one of the two X chromosomes are permanently inaccessible, a phenomenon is
called __________. Fill in the blank(s) with the appropriate word(s).
ANSWER: X chromosome inactivation
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The two countries that make up the majority of the world's population are
a. the United States and China. b. China and Japan. c. the United States and India. d. India and Pakistan. e. China and India.
Autotrophs must acquire carbon from organic molecules produced from other organisms.
a. true b. false
The accumulation of free oxygen in Earth's atmosphere began with the origin of _____
A) life and respiratory metabolism B) cyanobacteria using photosystem II C) chloroplasts in photosynthetic eukaryotic algae D) land plants
Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?
A) reptiles B) amphibians C) lobe-finned fish D) sharks