Quizizz #18

What was the key finding of Frederick Griffith's experiment with Streptococcus pneumoniae?

• A) DNA is the genetic material.

• B) Proteins are the genetic material.

• C) Bacteria can transform through heat-killed pathogenic strains.

• • D) Viruses inject protein into their host cells.

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

The Hershey-Chase experiment used which of the following to label DNA and proteins?

• A) Carbon isotopes

• B) Sulfur and phosphorus isotopes

• C) Nitrogen isotopes

• • D) Hydrogen isotopes

Erwin Chargaff's rules state that in any sample of double-stranded DNA:

• A) A=T and G≠C

• B) A+G=T+C

• C) A=T and G=C

• • D) A+T=G+C

Which technique did Rosalind Franklin and Maurice Wilkins use to study the structure of DNA?

• • A) Electron microscopy

• B) X-ray diffraction

• C) PCR amplification

• D) Chromatography

Watson and Crick are credited with:

• A) Discovering the helical structure of DNA

• B) Proving that DNA is the genetic material

• C) Developing the PCR technique

• • D) Identifying the base pairing rules

The double helix model of DNA suggests that:

• A) The strands run parallel in the same direction.

• B) The strands run antiparallel and are held together by hydrogen bonds.

• C) The strands are held together solely by covalent bonds.

• • D) The helices are composed of proteins.

If 20% of the nucleotides in a double-stranded DNA molecule are thymine, what percentage are guanine?

• A) 20%

• B) 30%

• C) 40%

• • D) 60%

The role of helicase in DNA replication is to:

• A) Synthesize a new strand of DNA

• B) Join Okazaki fragments together

• C) Unwind the DNA helix

• • D) Stabilize single-stranded DNA

Single-strand binding proteins function to:

• A) Cut the DNA strand to relieve supercoiling

• B) Prevent DNA strands from re-annealing

• C) Add RNA primers to the template strand

• • D) Synthesize DNA in the 5’ to 3’ direction

Topoisomerase works during DNA replication to:

• A) Synthesize the RNA primer

• B) Prevent tangling of the DNA strands ahead of the replication fork

• C) Remove the RNA primers and replace them with DNA

• • D) Catalyze the formation of phosphodiester bonds