Chapter 16 STUDY QUESTIONS
Multiple Choice Questions
1) For a couple of decades, biologists knew the nucleus contained DNA & proteins. The prevailing
opinion was that the genetic material was proteins, & not DNA. The reason for this belief was that
proteins are more complex than DNA. What was the basis of this thinking?
A) Proteins have a greater variety of three dimensional forms than does DNA.
B) Proteins have two different levels of structural organization; DNA has four.
D) Some viruses only transmit proteins.
2) In his transformation experiments, what did Griffith observe?
A) Mutant mice were resistant to bacterial infections.
B) Mixing a heat killed pathogenic strain of bacteria with a living nonpathogenic strain can convert
some of the living cells into the pathogenic form.
C) Mixing a heat killed nonpathogenic strain of bacteria with a living pathogenic strain makes the
pathogenic strain nonpathogenic.
D) Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains.
E) Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.
3) What does transformation involve 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) the type of semiconservative replication shown by DNA
E) assimilation of external DNA into a cell
4) The following scientists made significant contributions to our understanding of the structure &
function of DNA. Place the scientists' names in the correct chronological order, starting with the first
scientist(s) to make a contribution.
A) V, IV, II, I, III
B) II, I, III, V, IV
C) I, II, III, V, IV
D) I, II, V, IV, III
E) II, III, IV, V, I
5) After mixing a heat killed, phosphorescent strain of bacteria with a living nonphosphorescentstrain,
you discover that some of the living cells are now phosphorescent. Which observations would provide
the best evidence that the ability to fluoresce is a heritable trait?
A) DNA passed from the heat killed strain to the living strain.
B) Protein passed from the heat killed strain to the living strain.
C) The phosphorescence in the living strain is especially bright.
D) Descendants of the living cells are also phosphorescent.