IB Biology HL D1.2 Protein synthesis questions

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Question 1

Paper 2Easy5 marks

Researchers examine mature mRNA produced from the same gene in two cell types. The exons present in each mRNA are shown.

Cell typeExons in mature mRNA
X1, 2, 4
Y1, 3, 4
(a)

Identify the exon present in the mRNA from cell type X but absent from the mRNA from cell type Y.

[1]
(b)

State the two exons present in both mRNAs.

[2]
(c)

Using the table, explain how this gene can code for different polypeptides.

[2]

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