Biology CA4

Griffith's experiments with S. pneumoniae were significant because they showed that traits could be transferred from one organism to another What else did he find that was significant?

• Dna was the genetic material

• A virus made the bacteria pathogenic

• Heat kills bacteria

• Protein could not be the genetic material

• The transferred traits were heritable

In the Hershey and Chase experiment that helped confirm that DNA, not protein, was the hereditary material, what was the key finding?

• Radioactively labeled sulfur was present inside the infected bacteria.

• Radioactively labeled phosphorus was present inside the infected bacteria

• Radioactively labeled carbon was present inside the infected bacteria.

• Radioactively labeled sulfur was found outside of the infected bacteria.

• Radioactively labeled phosphorus was found outside of the infected bacteria.

Tags

NGSS.HS-LS3-1

Who conducted the X-ray diffraction studies that were key to the discovery of the structure of DNA?

• Chargaff

• Griffith

• Messelson

• Franklin

In his transformation experiments, what did Griffith observe?

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

• Mutant mice were resistant to bacterial infections

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

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

How is transformation in bacteria most accurately described?

• the infection of cells by a phage DNA molecule

• the type of semiconservative replication shown by DNA

• the creation of a strand of RNA from a DNA molecule

• assimilation of external DNA into a cell

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

• DNA contains purines, whereas protein includes pyrimidines.

• DNA contains phosphorus, whereas protein does not.

• DNA contains nitrogen, whereas protein does not.

• DNA contains sulfur where as protein does not Frederick

In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the

amount of cytosine. Which of the following investigators was (were) responsible for this discovery?

• Fredrick

• Matthew

• Oswald

• Erwin

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

It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information based on which of the following characteristics?

• Complementary pairing of bases

• the sequence of bases

• phospahte-sugar backbones

Tags

NGSS.HS-LS1-1

What is meant by the description "antiparallel" regarding the two strands of nucleic acids that make up DNA?

• The twisting nature of DNA creates nonparallel strands

• One strand contains only purines and the other contains pyramids

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

• base pairings create unequal spacing between DNA strands