Lesson 2.2.1
2.2.1 Nucleotides, DNA and RNA structure Quiz: Pearson Edexcel Biology, Unit 2
20 questions
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Lesson 2.2.1, Nucleotides, DNA and RNA structure: 20 multiple choice questions for the Pearson Edexcel Biology (9BI0), Unit 2: Genes and Health, written with Revision Ninja.
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The 20 questions
-
Which three chemical components make up a single nucleotide?
- Glycerol, fatty acid, base
- Sugar, phosphate, base
- Phosphate, amino acid, sugar
- Sugar, amino acid, base
-
Which sugar is found in DNA nucleotides?
- Deoxyribose
- Glucose
- Fructose
- Ribose
-
Which base is found in RNA but not in DNA?
- Thymine
- Uracil
- Cytosine
- Guanine
-
Which bases are purines?
- Thymine and cytosine
- Uracil and cytosine
- Adenine and guanine
- Adenine and thymine
-
Which of the following nitrogenous bases is a pyrimidine?
- Adenine
- Cytosine
- Purine
- Guanine
-
Which bond joins adjacent nucleotides in a single strand of DNA?
- Hydrogen bond
- Glycosidic bond
- Phosphodiester bond
- Peptide bond
-
How many hydrogen bonds form between adenine and thymine in DNA?
- Four
- Two
- One
- Three
-
In a DNA molecule, the proportion of adenine is 30%. What is the proportion of guanine?
- 40%
- 70%
- 20%
- 30%
-
A DNA double helix contains 10 A-T base pairs and 5 G-C base pairs. How many hydrogen bonds hold the two strands together?
- 30
- 40
- 25
- 35
-
What term describes two DNA strands running in opposite 5' to 3' directions?
- Parallel
- Antiparallel
- Semiconservative
- Complementary
-
Which pentose sugar is found in RNA nucleotides?
- Fructose
- Ribose
- Deoxyribose
- Glucose
-
How many polynucleotide strands normally form a functional RNA molecule?
- Two
- Four
- One
- Three
-
A short DNA strand has the sequence 5'-ATGC-3'. What is the sequence of the complementary strand written 5' to 3'?
- CGTA
- ATGC
- GCAT
- TACG
-
Which feature of DNA allows accurate replication using a template strand?
- Complementary base pairing
- Triple helix structure
- Ribose sugar backbone
- Phosphodiester backbone
-
Which factor provides cumulative stability across the length of a DNA molecule?
- Covalent hydrogen bonds
- Many hydrogen bonds
- Ionic salt bridges
- Strong peptide bonds
-
Which two groups are linked by a phosphodiester bond in a polynucleotide strand?
- Base and sugar
- Phosphate and base
- Two bases
- Phosphate and sugar
-
A student extracts DNA from a sample and finds that the proportion of cytosine is 18%. What proportion of thymine is expected?
- 64%
- 18%
- 32%
- 50%
-
Which two components combine to form a nucleoside?
- Sugar and base
- Base and phosphate
- Sugar and phosphate
- Two bases
-
What does the base sequence of DNA directly determine in a polypeptide?
- Monosaccharide sequence
- Phospholipid sequence
- Amino acid sequence
- Fatty acid sequence
-
A DNA sample contains 200 nucleotides in total. Each nucleotide has a mass of about 330 daltons. What is the approximate mass of the sample?
- 6600 daltons
- 330 000 daltons
- 66 000 daltons
- 660 daltons
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