B
1) In his transformation experiments, what did Griffith
observe?
A) Mixing a heat-killed pathogenic strain of bacteria
with a living nonpathogenic strain can convert some of the living
cells into the pathogenic form.
B) Mixing a heat-killed
nonpathogenic strain of bacteria with a living pathogenic strain makes
the pathogenic strain nonpathogenic.
C) Infecting mice with
nonpathogenic strains of bacteria makes them resistant to pathogenic
strains.
D) Mice infected with a pathogenic strain of bacteria
can spread the infection to other mice.
2) How do we describe transformation in bacteria?
A) the
creation of a strand of DNA from an RNA molecule
B) the creation of a strand of RNA from a DNA molecule
C) the infection of cells by a phage DNA molecule
D) assimilation of external DNA into a cell
4) In trying to determine whether DNA or protein is the genetic
material, Hershey and Chase made use of which of the following
facts?
A) DNA contains sulfur, whereas protein does not.
B)
DNA contains phosphorus, whereas protein does not.
C) DNA contains nitrogen, whereas protein does not.
D)
DNA contains purines, whereas protein includes pyrimidines.