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Edexcel A-Level Biology AS 2.9 Nucleotides Dna Rna and Base Pairing Questions

Practise recognising DNA and RNA structures, naming nucleotide components, and applying base-pairing and bonding rules in diagrams.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • label nucleotide diagrams with phosphate, sugar, base and phosphodiester bonds
  • distinguish DNA and RNA by sugar, bases, strand structure and folded tRNA
  • apply complementary base pairing and hydrogen bonding to DNA double-helix diagrams

Edexcel A-Level Biology AS 2.9 Nucleotides Dna Rna and Base Pairing Questions question 1

[Maximum number: 5]

Two types of polynucleotide, DNA and RNA, are found in the body.

Question (a)

(a)

Read through the following description of DNA. Complete the description by writing the most appropriate word or words on the dotted lines. The mononucleotides that join together to form DNA consist of a base, a and a sugar. The mononucleotides are joined together by bonds to form a strand of DNA.

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Question (b)

(b)

Two types of RNA are messenger RNA (mRNA) and transfer RNA (tRNA). The table shows some features of RNA. For each feature, put one cross ⊞ in the appropriate box, in each row, to show the features that are present in these types of RNA.

Table for Question (b) — Edexcel A-Level Biology AS
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