Which scientist(s) identified the transforming
substance involved in changing rough (R) bacteria to
smooth (S)?
a. Avery and McCarty
b. Griffith
c. Chargaff
d. Hershey and Chase
e. Pauling
Answer: a
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You are examining an enzyme associated with mannose catabolism. As such, you would expect the protein to be
A) degraded. B) a hormone. C) induced by mannose. D) expressed only during development. E) expressed only in neurons.
Where do cold ocean currents generally occur?
a. along the west coast of continents b. near the poles c. near the equator d. along the east coast of continents e. in the open ocean
Once a probe has hybridized with a gene of interest in a DNA library, the hybrid is identified by detection of ____
a. its sticky tail b. its radioactive label c. restriction enzymes d. mRNA e. the vector
Which of the following statements about nucleosomes is false?
A. Nucleosomes convert a DNA molecule into a chromatin thread about one-third the length of the initial DNA. B. Nucleosomes are found only in mitotic chromosomes. C. Nucleosomes can be seen in the electron microscope. D. Nucleosomes represent the first and most fundamental level of chromatin packing. E. A nucleosome consists of DNA wrapped around eight histone proteins, plus a short segment of linker DNA.