What are genes made of?

Scientists knew chromosomes were primarily made of protein and DNA, but did not know which actually made up genes. What are the two main components scientists considered?

• Protein and DNA

• RNA and Lipids

• Carbohydrates and RNA

• Lipids and Carbohydrates

Tags

NGSS.HS-LS1-1

DNA is composed of how many nucleotides?

• Four

• Two

• Five

• Six

Proteins contain how many distinct amino acids?

• 20

• 10

• 5

• 50

A series of experiments in the 1920's to 1950's determined that ______ is the genetic material.

• Protein

• DNA

• RNA

• Lipids

Tags

NGSS.HS-LS3-1

In 1928, who studied Streptococcus pneumoniae, a pathogenic bacterium causing pneumonia?

• Frederick Griffith

• Louis Pasteur

• Alexander Fleming

• Robert Koch

What is the difference between the two strains of Streptococcus studied by Frederick Griffith?

• S strain is virulent, R strain is nonvirulent

• S strain is nonvirulent, R strain is virulent

• Both strains are virulent

• Both strains are nonvirulent

Fill in the blank: Frederick Griffith infected mice with both strains of Streptococcus hoping to understand the ______ between the strains.

• difference

• relationship

• origin

• color

Which bacterium did Frederick Griffith study in 1928?

• Streptococcus pneumoniae

• Escherichia coli

• Bacillus subtilis

• Staphylococcus aureus

According to Griffith's Results, what happened when live virulent (S) strain cells of S. pneumoniae were injected into mice?

• The mice lived

• The mice died

• The mice became immune

• The mice showed no reaction

According to Griffith's Results, what was the outcome when live nonvirulent (R) strain cells of S. pneumoniae were injected into mice?

• The mice died

• The mice lived

• The mice became sick

• The mice became immune