Which term refers to duplication of the complete set of chromosomes in an organism's cell, followed by the separation of the duplicated chromosomes into two new cells?
a. zygote formation
b. mitotic cell division
c. binary fission
d. meiotic cell division
Answer: b. mitotic cell division
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What can be assumed from these results?
In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate. A. The newly synthesized compound induces a mutation in the bacteria. B. The bacteria no longer produce histidine. C. The bacteria produce histidine. D. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine. E. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
Benign tumors can be life-threatening when they form in which tissue?
a. skin b. large intestines c. kidneys d. brain e. liver
Bone mass typically increases until we turn
a. 10. b. 15. c. 25. d. 35. e. 45
Comparing a single-celled eukaryotic organism with a multicellular organism such as yourself identify the major difference from the list below.
a. Escape from predator b. Finding a mate c. Division of labor d. Find its own food e. Nucleus