Lesson 3.1.5.1.1
3.1.5.1.1 Nucleotides and the structure of DNA and RNA Quiz: AQA Biology, Unit 1
20 questions
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Lesson 3.1.5.1.1, Nucleotides and the structure of DNA and RNA: 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 three components assemble to form a single DNA nucleotide?
- Deoxyribose, glycerol, base
- Ribose, phosphate, base
- Deoxyribose, phosphate, base
- Glucose, phosphate, base
-
Which pentose sugar is found in DNA nucleotides?
- Deoxyribose
- Fructose
- Ribose
- Glucose
-
Which base is found in RNA but not in DNA?
- Adenine
- Thymine
- Uracil
- Guanine
-
Which bond links adjacent nucleotides together in a polynucleotide strand?
- Peptide bond
- Phosphodiester bond
- Hydrogen bond
- Glycosidic bond
-
Which nitrogenous base pairs with adenine in a molecule of DNA?
- Guanine
- Thymine
- Uracil
- Cytosine
-
How many hydrogen bonds form between cytosine and guanine?
- 4
- 3
- 2
- 1
-
How does the overall chain structure of RNA differ from DNA?
- Circular double helix
- Double polynucleotide strand
- Single polynucleotide strand
- Triple polynucleotide strand
-
In a DNA sample, 30% of the bases are adenine. What percentage of the bases are guanine?
- 20%
- 70%
- 40%
- 30%
-
A DNA molecule contains 100 A-T base pairs and 50 C-G base pairs. How many hydrogen bonds hold the base pairs together?
- 300
- 400
- 250
- 350
-
A DNA double helix is made of two strands each of 1000 nucleotides. How many phosphodiester bonds are present in total?
- 1999
- 2000
- 1998
- 1996
-
Which of these bases is a purine, with a double-ring structure?
- Guanine
- Uracil
- Thymine
- Cytosine
-
Which base pairs with adenine in RNA?
- Uracil
- Cytosine
- Guanine
- Thymine
-
How does deoxyribose differ structurally from ribose?
- One extra oxygen
- One extra carbon
- One fewer carbon
- One fewer oxygen
-
Which bonds hold the two polynucleotide strands together in a DNA double helix?
- Phosphodiester bonds
- Peptide bonds
- Ionic bonds
- Hydrogen bonds
-
A DNA molecule has 20% cytosine among 3000 total bases. How many guanine bases are present?
- 300
- 600
- 1200
- 900
-
How can DNA store vast amounts of genetic information using only four bases?
- Variable base sequence
- Variable sugar structure
- Variable phosphate positions
- Variable hydrogen bonds
-
What provides structural stability to the DNA double helix?
- Peptide cross-links
- Many hydrogen bonds
- Disulphide bridges
- Strong ionic pairs
-
Why is an mRNA molecule much shorter than a DNA molecule?
- Contains no sugar
- Lacks nitrogenous bases
- Lacks phosphate groups
- Copies one gene
-
Why is DNA chemically more stable than RNA in cells?
- Lacks hydrogen bonds
- Lacks 2-prime hydroxyl
- Contains uracil
- Is single-stranded
-
A double-stranded DNA sample contains 40% thymine. What percentage of cytosine is present?
- 40%
- 20%
- 60%
- 10%
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