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WorksheetsSTUDY QUESTIONS: DNA Structure and Replication
Total questions: 20
Worksheet time: 10mins
How are the two strands of DNA oriented relative to each other in the double helix?
The two strands are parallel, running in the same direction.
The two strands are anti-parallel, meaning one runs 5' to 3' and the other runs 3' to 5'.
The two strands are coiled in opposite directions.
The two strands are oriented randomly without any specific direction.
What element was used to tag the coating of the bacteriophage in the Hersey and Chase experiment?
Phosphorus
Sulfur
Carbon
Oxygen
Describe the directionality of a DNA strand.
DNA strands are oriented from 3' to 5'.
DNA strands have directionality, with one end being the 5' end and the other being the 3' end.
DNA strands are always circular in structure.
DNA strands do not have any specific directionality.
What is semi-conservative replication, and why is it important for DNA replication?
It means each new DNA molecule contains two new strands, which increases mutation rates.
It means each new DNA molecule contains one old and one new strand, ensuring accuracy.
It refers to the process of DNA being replicated in a conservative manner, preserving the original strand.
It indicates that DNA replication occurs only in the presence of certain enzymes.
What element was used to tag the material inside the bacteriophage in the Hersey and Chase experiment?
Carbon
Nitrogen
Phosphorus
Sulfur
What is the function of DNA polymerase I?
Removes the RNA primers that were laid down for DNA polymerase III to create a new strand and replaces them with DNA nucleotides.
Synthesizes RNA primers for DNA replication.
Replicates the entire DNA strand during cell division.
Acts as a proofreader for DNA replication.
Explain the role of ligase in DNA replication.
Ligase unwinds the DNA helix to allow replication.
Ligase joins Okazaki fragments together to create a continuous DNA strand.
Ligase synthesizes RNA primers for DNA replication.
Ligase separates the two strands of DNA during replication.
What is the role of hydrogen bonds in DNA structure?
Hydrogen bonds hold the two strands of DNA together by pairing complementary bases.
Hydrogen bonds provide energy for DNA replication.
Hydrogen bonds prevent mutations in DNA sequences.
Hydrogen bonds are responsible for the color of DNA.
Explain the concept of base pairing in DNA. Which bases pair together and how many hydrogen bonds do they form?
Adenine pairs with thymine (2 hydrogen bonds), and guanine pairs with cytosine (3 hydrogen bonds).
Adenine pairs with cytosine (2 hydrogen bonds), and guanine pairs with thymine (3 hydrogen bonds).
Thymine pairs with guanine (2 hydrogen bonds), and cytosine pairs with adenine (3 hydrogen bonds).
Adenine pairs with thymine (3 hydrogen bonds), and guanine pairs with cytosine (2 hydrogen bonds).
What is the shape of a DNA molecule, and who first proposed this model?
A. Single helix, proposed by Rosalind Franklin
B. Double helix, proposed by James Watson and Francis Crick
C. Triple helix, proposed by Linus Pauling
D. Circular, proposed by Gregor Mendel
When does DNA replication occur?
During cell division
Before cell division (mitosis and meiosis)
After cell division
Only in prokaryotic cells
Describe the structure of a DNA nucleotide.
A DNA nucleotide consists of a phosphate group, a deoxyribose sugar, and a nitrogenous base.
A DNA nucleotide consists of a phosphate group, a ribose sugar, and a nitrogenous base.
A DNA nucleotide consists of a phosphate group, a deoxyribose sugar, and an amino acid.
A DNA nucleotide consists of a sugar, a nitrogenous base, and a lipid.
How many RNA primers are needed for the new DNA strand to be built on the leading strand?
1
2
3
4
What is the significance of the 3' and 5' ends of a DNA strand?
They determine the genetic code of the DNA.
They are important for DNA replication and the direction of synthesis.
They indicate the location of genes on the DNA strand.
They are involved in the formation of RNA from DNA.
What is the lagging strand, and why is it synthesized in fragments?
The lagging strand is synthesized in short segments called Okazaki fragments due to its opposite orientation.
The lagging strand is synthesized continuously in the same direction as the replication fork.
The lagging strand is synthesized in a single long piece without interruptions.
The lagging strand is synthesized only during the G1 phase of the cell cycle.
What is the difference between a chromosome and a chromatid in terms of DNA structure?
A chromosome is a single, long DNA molecule, while a chromatid is one half of a duplicated chromosome.
A chromosome is made up of two chromatids, while a chromatid is a single DNA strand.
A chromosome contains only RNA, while a chromatid contains only DNA.
A chromosome is found in the cytoplasm, while a chromatid is found in the nucleus.
Describe the function of DNA polymerase III during replication.
DNA polymerase III synthesizes new RNA strands by adding nucleotides complementary to the template strand.
DNA polymerase III synthesizes new DNA strands by adding nucleotides complementary to the template strand.
DNA polymerase III repairs damaged DNA strands during replication.
DNA polymerase III unwinds the DNA double helix during replication.
Describe the significance of the Hershey-Chase experiment.
It proved that proteins are the genetic material.
It demonstrated that DNA, not protein, is the genetic material.
It showed that RNA is the primary genetic material.
It indicated that viruses do not contain genetic material.
What did Griffith’s experiment demonstrate about DNA?
DNA is the primary energy source for cells.
DNA can transfer genetic information between organisms.
DNA is responsible for protein synthesis.
DNA is only found in the nucleus of eukaryotic cells.
What SPECIFIC location would someone look to determine if a nucleotide is from DNA or RNA?
The second carbon on the nucleotide sugar.
The first carbon on the nucleotide sugar.
The phosphate group of the nucleotide.
The nitrogenous base of the nucleotide.
