E606 1/14/24

In his transformation experiments, what did Griffith observe?

• Mutant mice were resistant to bacterial infections.

• Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains.

• Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.

• Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic.

In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following fact?

• DNA contains sulfur, whereas protein does not

• DNA contains phosphorus, whereas protein does not

• DNA contains nitrogen, whereas protein does not

• RNA includes ribose, whereas DNA includes deoxyribose sugars

Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine?

• 8%
  

• 16%

• 31%

• 42%

Replication in prokaryotes differs from replication in eukaryotes for which of the following reasons?

• Prokaryotic chromosomes have a single origin of replication, whereas eukaryotic chromosomes have many.

• Prokaryotic chromosomes have histones, whereas eukaryotic chromosomes do not

• The rate of elongation during DNA replication is slower in prokaryotes than in eukaryotes

• Prokaryotes produce Okazaki fragments during DNA replication, but eukaryotes do not

What is meant by the description "antiparallel" regarding the strands that make up DNA?

• 
  The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand.
  

• One strand contains only purines and the other contains only pyrimidines.

• One strand is positively charged and the other is negatively charged.

• Base pairings create unequal spacing between the two DNA strands.