If you could take a time machine back to the Carboniferous period, which of the following would you most likely encounter?

a. Creeping mats of low-growing bryophytes
b Fields of tall grasses swaying in the wind
c. Swampy forests dominated by tree lycophytes, horsetails, and ferns
d. Huge forests of naked-seed trees filling the air with pollen
e. The dominance of flowering plants


Answer: c. Swampy forests dominated by tree lycophytes, horsetails, and ferns

Biology & Microbiology

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Cells with a nucleus are called __________; cells without a nucleus are called __________

A. animals; plants B. prokaryotes; eukaryotes C. eukaryotes; yeast D. bacteria; animals E. eukaryotes; prokaryotes

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Which of the following statements is not true of the TCA cycle?

A) Oxidation occurs at three steps in the TCA cycle. B) Decarboxylation occurs at two steps in the TCA cycle. C) ATP/GTP is generated at one point by substrate-level phosphorylation. D) Acetate enters the TCA cycle and joins a four-carbon acceptor molecule to form citrate. E) FAD is an electron acceptor in the cycle.

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Tetrads fail to separate correctly during anaphase in this process.

a. Crossing-over b. Inversion c. Translocation d. Nondisjunction e. Deletion

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Resident flora are easily removed by hand hygiene. ?

Indicate whether the statement is true or false

Biology & Microbiology