Which of the following statements regarding cDNA libraries is false?
a. They are usually double stranded DNA.
b. They are composed of DNA synthesized with the use of reverse transcriptase.
c. They are composed of DNA synthesized from an mRNA template.
d. They contain introns and exons.
e. They contain DNA that is complementary to the mRNA from which it was synthesize
D
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An absorption spectrum is a graph that shows ________
a. absorption of different wavelengths of light by a pigment b. photosynthetic activity at various wavelengths of light c. wavelengths of visible light only d. wavelengths of various forms of radiation
Because old species become extinct as new species evolve, suggest a situation that makes a particular species vulnerable to extinction.
a. alterations in chromosome number b. ability to compete for limited resources c. adaptive radiation d. ability to adjust to a variety of habitats e. environmental changes for species with highly specialized adaptations
Gymnosperms and angiosperms have the following in common except:
a. ovules. b. seeds. c. pollen. d. ovaries. e. vascular tissue.
Bacteria synthesize CDP-diacylglycerol in order to build ________, a major cell membrane phospholipid component.
A. lipopolysaccharide B. phosphatidylethanolamine C. lipid rafts D. peptidoglycan