CAIE A-Level Biology 6.1.6 Messenger RNA Structure

Practise describing single-stranded mRNA with ribose and uracil, comparing it with DNA and explaining temporary internal A–U or C–G pairing by hydrogen bonds.

Exam points

describe mRNA as a single polynucleotide strand with ribose and phosphate backbone
replace thymine with uracil while retaining adenine, cytosine and guanine
explain temporary RNA base pairing through complementary sequences and hydrogen bonds

[Maximum number: 3]

DNA and RNA are polynucleotides.

Describe three ways in which the structure of messenger RNA (mRNA) differs from the structure of DNA.

In each of your answers, include information about the structure of mRNA and the structure of DNA.

1.

2.

3

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6.1.6—RNA (mRNA) structure question 1