What is a "benign" tumor?
A. A single mutated cell that could potentially develop into cancer
B. A mass of cancerous cells
C. A mass of cells that grows out of control and spreads to other tissues
D. A mass of cells that grows out of control but remains at the site of origin
Answer: D
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In an experiment described in a chemistry lab book, the directions state that after mixing two chemicals (A and B) and waiting 5 minutes that A will be oxidized. This means that:
A. chemical A has lost electrons to chemical B. B. chemical A has gained electrons from chemical B. C. chemical A has gained energy in the form of heat from chemical B. D. chemical A has lost energy in the form of heat to chemical B. E. chemical A has reacted with oxygen.
A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host. Which of the following procedures would best test the researcher's hypothesis?
A. Design a method to isolate the bacteria from the insect, then mutate the bacteria in the region of DNA that controls vitamin production and compare growth of the mutant and wild-type bacteria on minimal media B. Extract the DNA from the bacteria and from the insect, then use reverse-transcriptase PCR and primers specific to the gene that controls vitamin synthesis to compare transcription of RNA in both organisms C. Determine which insecticide kills the insect without harming the bacterial host, then compare vitamin production by the bacteria from insects treated with the insecticide to those from untreated insects D. Determine which antibiotic kills the bacteria without harming the host, then administer this antibiotic to the insect and compare its growth with and without the vitamin
__________ developed the binomial system of nomenclature
a. Charles Darwin b. Carolus Linnaeus c. Gregor Mendel d. Paul Hebert e. Ernst Haeckel
A _________ reveals the number, size, and form of chromosomes found in actively dividing cells.
Fill in the blank(s) with the appropriate word(s).