DNA Structure and Function Worksheet

What enzyme is responsible for breaking hydrogen bonds during DNA replication?

• DNA ligase

• DNA polymerase

• Topoisomerase

• Helicase

• Primase

In the Hershey-Chase experiment, it was demonstrated that DNA, and not protein, is the genetic material because __________.

• radioactive sulfur labeled the DNA, which was found in the infected bacteria.

• radioactive phosphorus labeled the DNA, which was found inside the bacteria, while radioactive sulfur labeled the protein, which remained outside

• radioactive nitrogen labeled the DNA, which was found inside the bacteria

• radioactive carbon labeled the DNA, which was found inside the bacteria.

• radioactive hydrogen labeled the protein, which was found in the infected bacteria.

Tags

NGSS.HS-LS3-1

What type of mutation is caused by the change of a single base pair?

• Chromosomal mutation

• Point mutation

• Duplication mutation

• Inversion mutation

• Deletion mutation

Tags

NGSS.HS-LS3-2

Which enzyme catalyzes the formation of the phosphodiester bond to connect Okazaki fragments?

• Helicase

• DNA polymerase

• Primase

• DNA ligase

• Topoisomerase

Which of the following statements about the uncertainty regarding DNA or proteins as hereditary material is true?

• Scientists were sure that DNA was the hereditary material because chromosomes are made only of DNA

• Proteins were dismissed early as potential hereditary material due to their simple structure.

• Chromosomes are composed only of proteins, leading to initial beliefs that proteins were the hereditary material.

• The chromosome theory of inheritance quickly identified proteins as the hereditary material.

• There was uncertainty because chromosomes are made of both DNA and proteins.

Which of the following statements about Watson and Crick’s DNA model predictions is true?

• The DNA molecule is a triple helix

• Both DNA strands run in the 5’ to 3’ direction.

• The bases are located on the exterior of the DNA molecule.

• The DNA molecule has a variable diameter along its length.

• The DNA molecule is a double helix with antiparallel strands.

Which of the following statements about the functions of DNA is true?

• DNA only stores genetic information and has no other functions.

• DNA does not mutate and remains constant throughout generations.

• DNA's base sequence encodes large amounts of information.

• DNA cannot be replicated precisely during cell division.

• DNA is not involved in phenotype expression.

Tags

NGSS.HS-LS1-1

Which of the following statements about the models of DNA replication is false?

• The semiconservative model involves each parental strand acting as a template for a new strand.

• The conservative model involves both parental strands remaining together.

• The dispersive model involves segments of parental DNA interspersed with new DNA.

• The semiconservative model was proven incorrect by the Meselson-Stahl experiment.

• The conservative model was one of the initially proposed models of DNA replication.

Which of the following statements about the initiation of DNA replication is false?

• DNA replication begins at multiple origins of replication.

• Helicase unwinds the DNA at the replication fork.

• Primase synthesizes an RNA primer.

• Topoisomerase relieves twisting ahead of the replication fork.

• DNA ligase synthesizes new DNA strands.

Which of the following statements about elongation in DNA replication is true?

• DNA polymerase synthesizes new DNA strands in the 3’ to 5’ direction.

• The lagging strand is synthesized continuously.

• Okazaki fragments are synthesized on the lagging strand.

• Primase removes RNA primers and replaces them with DNA.

• DNA ligase synthesizes RNA primers.