Chapter 13 Part 1

pathogenic control

• Living S cells

• Living R cells

• Heat-killed S cells

• Mixture of heat-killed S and living R

nonpathogenic

• Living S cells

• Living R cells

• Heat-killed S cells

• Mixture of heat-killed S and living R

What is the result of Frederick Griffith's experiment with the mixture of heat-killed S and living R cells

• The mouse dies

• the mouse is healthy

heat protein leads to (**not in the DNA**)

harmless bacteria absorb ___ of harmful bacteria, so it becomes harmful

Who identified transforming substance as DNA?

• Frederick Griffith

• Oswald Avery

• Hershey and Chase

• Erwin Chargaff

Who reported that DNA composition varies from species and that % of nitrogenous bases are equal?

• James Watson

• Francis Crick

• Maurice Wilkins

• Erwin Chargaff

Hershey and Chase Experiment

• Blue (radioactivity in liquid)

• Blue (radioactivity in pellet)

• Pink (radioactivity in liquid)

• Pink (radioactivity in pellet)

What did Hershey and Chase use the blender for in their experiment?

• to extract DNA outside bacteria

• remove phage particles adhered to outer bacterial membrane

• to condense bacteriophages

• test to see radioactivity

What processes occur during Hershey and Chase experiment?

• Infection

• Blending

• Separation

• Centrifugation