The great apes and first hominids arose from a common ancestor approximately ____ years ago

a. 100,000
b. 1 million
c. 3 million
d. 5 million
e. 7 million


E

Biology & Microbiology

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The genomes of mammalian mitochondria contain

A. a total of 37 genes. B. genes for proteins used in oxidative phosphorylation. C. genes whose products are used in translation of mRNA. D. ribosomal genes. E. All of the items listed are correct.

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As a direct result of cleavage, ________

a. a zygote becomes a blastula b. ectoderm differentiates from endoderm c. a blastula becomes a blastocoel d. a blastula becomes a gastrula

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The nitrogen cycle on land begins with

a. nitrification. b. denitrification. c. decomposition. d. uptake by producers. e. nitrogen fixation

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The atomic number of an atom refers to its ____.

A. mass or weight B. number of protons C. number of protons and neutrons D. number of neutrons E. number of electrons

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