Which technique did Rosalind Franklin use to determine many aspects of DNA’s structure?
a. transformation
b. transmission electron microscopy
c. density-gradient centrifugation
d. x-ray crystallography
e. chromatography
ANSWER: d
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These biological compounds are non-polar and insoluble in water:
A. proteins B. nucleic acids C. lipids D. carbohydrates
The purpose of irradiating foods is to
a. increase the vitamin content. b. increase the mineral content. c. destroy harmful bacteria, fungi and other microorganisms. d. limit spoilage. e. both destroy harmful bacteria, fungi, and other microorganisms and limit spoilage.
Using hair as the derived trait, four of the following organisms fit in the clade. Which one does not fit?
A. Whale B. Crocodile C. Wolf D. Elephant E. Tiger
What is the best definition for recombinant DNA?
A) a type of nucleic acid that includes both RNA and DNA strands B) DNA that includes nucleotides from two different sources C) an alternate form of DNA that is the product of a mutation