Cells that possess a nucleus and a membrane system that establishes internal compartments belong in which of the following groups?
A) viruses B) Bacteria C) Archaea D) eukaryotes
Answer: D
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The Danish physician Hans Christian Gram
A. developed the Gram-stain technique B. devised the metric system of weights (milligrams, grams, kilograms) C. developed the procedures for determining whether a particular organism causes a specific disease D. developed both the Gram stain and the method of determining whether a particular organism causes a specific disease E. none of the other options presented
World human population in 2009 is approximately
A. 670 million. B. 1.8 bilion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.
Evidence supporting the lack of oxygen on early Earth includes _____
a. the presence of early photosynthesizers b. the immediate breakdown of organic molecules c. the lack of iron oxidation on ancient rocks d. the presence of iron oxidation on ancient rocks e. the accumulation of ozone
What is the key characteristic that defines the Ecdysozoa clade?
a. The animal molts. b. The animal is a deuterostome. c. The animal has motile larvae. d. The animal has bilateral symmetry. e. The animal develops three tissue layers.