Lesson 3.1.5.2.1
3.1.5.2.1 Semi-conservative DNA replication Quiz: AQA Biology, Unit 1
20 questions
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Lesson 3.1.5.2.1, Semi-conservative DNA replication: 20 multiple choice questions for the AQA Biology (7402), Unit 1: Biological molecules, written with Revision Ninja.
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The 20 questions
-
Which enzyme unwinds the DNA double helix and breaks the hydrogen bonds between bases during replication?
- ATP hydrolase
- ATP synthase
- DNA polymerase
- DNA helicase
-
Which enzyme joins adjacent nucleotides together during DNA replication?
- Lipase
- Amylase
- DNA helicase
- DNA polymerase
-
How many original strands are present in each daughter DNA double helix?
- None
- Four
- One
- Two
-
Which bonds break when DNA unwinds during replication?
- Ionic bonds
- Ester bonds
- Phosphodiester bonds
- Hydrogen bonds
-
How does a template DNA strand determine the sequence of a new strand?
- Phosphodiester bond formation
- Hydrogen bond hydrolysis
- Complementary base pairing
- Active transport
-
Which bond is formed by DNA polymerase during DNA replication?
- Hydrogen bond
- Peptide bond
- Glycosidic bond
- Phosphodiester bond
-
Which scientists provided experimental evidence for semi-conservative DNA replication using nitrogen isotopes?
- Watson and Crick
- Meselson and Stahl
- Rosalind Franklin
- Hershey and Chase
-
A DNA molecule has 1000 base pairs and replicates once. How many new nucleotides must be assembled in total?
- 2000
- 500
- 4000
- 1000
-
A DNA molecule labelled with heavy nitrogen (15N) is replicated for two generations in light nitrogen (14N). What fraction of the resulting DNA molecules contain only 14N?
- 0
- 1/2
- 3/4
- 1/4
-
A DNA molecule replicates three times. How many DNA molecules are produced from one starting molecule?
- 3
- 6
- 8
- 16
-
What is the immediate effect of inhibiting DNA helicase during replication?
- Primers cannot bind
- Backbone breaks apart
- Strands cannot separate
- Ribosomes stop working
-
During replication of a DNA molecule with 100 A-T base pairs, how many hydrogen bonds must be broken to separate the strands?
- 200
- 300
- 400
- 100
-
What acts as the template during the synthesis of a new DNA strand?
- An original strand
- A new strand
- A tRNA molecule
- An mRNA strand
-
In which direction does DNA polymerase synthesise a new DNA strand?
- 3' to 1' direction
- 5' to 3' direction
- 5' to 2' direction
- 3' to 5' direction
-
In the Meselson and Stahl experiment, what band was observed after one generation in light nitrogen?
- One intermediate band
- One heavy band
- Two separate bands
- One light band
-
A DNA molecule of 500 base pairs (1000 nucleotides in total) replicates four times in a medium containing all required nucleotides. How many new nucleotides are assembled overall?
- 14000
- 15000
- 16000
- 1000
-
Why does semi-conservative replication ensure genetic continuity between cell generations?
- Causes frequent mutations
- Synthesises triple helices
- Preserves original sequence
- Produces random bases
-
Which nitrogenous base always pairs with adenine in DNA?
- Cytosine
- Guanine
- Thymine
- Uracil
-
Why were nitrogen isotopes used in the Meselson and Stahl experiment?
- Different chemical charges
- Different fluorescence levels
- Different radioactivities
- Different molecular densities
-
What can prevent a daughter DNA molecule from being genetically identical to its parent?
- Replication errors
- Helicase action
- Phosphodiester bonds
- Hydrogen bonding
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