Quiz - DNA Structure

Griffith isolated two strains of bacteria. Which one was the virulent bacteria?

• S-strain

• R-strain

• P-strain

• K-straain

What was the primary focus of Frederick Griffith's experiments?

• Investigating the structure of DNA

• Exploring the role of bacteria in causing diseases

• Studying the effects of antibiotics on bacterial growth

• Examining the process of photosynthesis in plants

If 32% of all nucleotides is thymine and 18% is guanine, how much percent is cytosine?

• 32

• 18

• 50

• We can't tell

What bacterium did Frederick Griffith use in his experiments?

• Escherichia coli

• Streptococcus pneumoniae

• Staphylococcus aureus

• Bacillus subtilis

What was the outcome of Griffith's experiments with mice?

• The mice remained healthy after exposure to the bacteria

• The mice developed symptoms of a bacterial infection but recovered quickly

• The mice died from pneumonia caused by the bacteria

• The mice developed immunity to the bacteria

What did Griffith observe when he injected mice with a mixture of heat-killed S strain bacteria and live R strain bacteria?

• The mice developed pneumonia and died

• The mice remained healthy with no signs of infection

• The mice developed mild symptoms of illness but recovered

• The mice developed immunity to the bacteria

What conclusion did Griffith draw from his experiments?

• Heat-killed bacteria can cause infections in mice

• Transformation had occurred, and genetic material could be transferred between bacteria

• Mice are immune to bacterial infections

• Bacterial infections are caused by viruses

What is bacterial transformation?

• The process by which bacteria reproduce

• The process by which bacteria exchange genetic material with their environment

• The process by which bacteria undergo cell division

• The process by which bacteria form spores

Which of the following is true about plasmids in bacterial transformation?

• Plasmids are a type of bacteria-killing virus

• Plasmids are circular pieces of DNA found only in eukaryotic cells

• Plasmids are used by bacteria to exchange genetic material with their environment

• Plasmids are structures used by bacteria for locomotion

What is the shape of the DNA molecule?

• Linear

• Circular

• Helical

• Cuboidal