MMSC490 Practice Exam 1 (100% Accurate Answers)

cytoplasmic organelles are: a. absent in prokaryotic cells and present in eukaryotic cells. b. present in both prokaryotic and eukaryotic cells. c. present in prokaryotic cells and absent in eukaryotic cells. d. absent in both prokaryotic and eukaryotic cells. correct answers a. absent in prokaryotic cells and present in eukaryotic cells E. coli is a useful model system for molecular biology studies because: a. it has a small genome. b. it reproduces rapidly. c. mutants can easily be isolated from culture dishes. d. All of the above correct answers d. all of the above Arabidopsis thaliana is a model organism for studying the molecular biology of: a. plants. b. fungi. c. fruit flies. d. vertebrates. correct answers a. plants The diffraction limited resolving power of a standard light microscope is approximately: a. 0.2 mm. b. 0.2 µm. c. 0.2 nm. d. 2 Å. correct answers b. 0.2 um A common use of green fluorescent protein (GFP) is to: a. label antibodies. b. visualize proteins in living cells. c. photobleach other fluorescent proteins. d. label DNA sequences. correct answers b. visualize proteins in living cells Electron microscopes have a resolution advantage over light microscopes because: a. electron microscopes allow the viewer to examine living cells. b. electron microscope lens have a larger numerical aperture. c. electron microscopes are easier to use. d. the wavelength of electrons is shorter than that of light correct answers d. the wavelength of electrons is shorter than that of light In a classic experiment that demonstrated the semiconservative nature of DNA replication, cells were grown first in 14N-containing media and later in 15N-containing media, and DNA was separated by: a. electrophoresis.