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1.2 What happens in cells (and what do cells need)?

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Question 2

An mRNA molecule is formed by splicing different coding sections (exons) of a pre-mRNA transcript. Suppose a particular gene contains four distinct coding sections: Section 1, Section 2, Section 3, and Section 4.

a.

Explain how altering the order in which these four sections are joined together in the mature mRNA produces a protein with a different structure.

[3]
b.

Calculate the total number of unique proteins that can be formed if all four sections are used exactly once in the mature mRNA molecule.

[2]
c.

Compare the structure and localization of DNA found in eukaryotic cells with that found in prokaryotic cells.

[4]
Markscheme

1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

72 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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