The Carboniferous Period is known for
A. the appearance of the first true mammals.
B. the first examples of terrestrial gymnosperms.
C. the appearance of the first angiosperms.
D. the formation of rich coal deposits.
E. a rapid increase in the diversity of marine invertebrates.
Answer: D
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A population that is in genetic equilibrium is said to ____
a. have an equal number of homozygotes as heterozygotes for a given trait b. deviate from the Hardy-Weinberg law c. require genetic testing for estimation of allele frequencies d. lose genetic variation with each generation e. have an allele or alleles that remain constant generation to generation
Which of the following is true?
a. Eukaryotes are smaller than prokaryotes. b. Prokaryotes are smaller than eukaryotes. c. Prokaryotes and eukaryotes are approximately the same size. d. Most prokaryotes are larger than eukaryotes, but not all.
In the biology lab, you are shown petri dishes of cheek cell cultures. One set of cells is thin, with individual cells arranged in a single, orderly layer. The other culture shows irregular crowding of cells. The crowding cells are likely cancer cells, showing an absence of
A. telomerases. B. All of the answer choices are correct. C. oncogenes. D. contact inhibition. E. angiogenesis.
Kauai, the first of the big islands of the Hawaiian
Archipelago, rose from the sea more than _________ years ago. a. 5 billion b. 1 billion c. 5 million d. 1 million e. 400,000