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IB Biology HL D1.2.16 Hl Alternative Splicing Questions

Explore how one pre-mRNA can be spliced into different mature transcripts and protein variants in IB Biology HL D1.2.16.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Define alternative splicing as joining different combinations of exons from one pre-mRNA.
  • Explain how one gene can produce multiple mRNA transcripts and protein variants through alternative exon selection.
  • Relate alternative splicing to increased proteome or antibody diversity without increasing the number of protein-coding genes.

Learn this topic

Study D1.2.16 (HL)—Alternative splicing conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D1.2.16 Hl Alternative Splicing Questions question 1

[Maximum number: 1]

The number of protein-coding genes in the human genome is estimated to be about 20000 , which is much less than the size of the proteome. What is one reason for this?

A

Exons are removed from RNA before translation.

B

There are more types of amino acids than nucleotides.

C

mRNA can be spliced after transcription.

D

Base substitutions occur during transcription.

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