Practice IB Biology Topic D1.2 Protein Synthesis with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for D1.2 Protein Synthesis and mirrors Paper 1A, 1B, 2 style where relevant.
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All mixtures contain DNA, nucleotides, amino acids and tRNAs. Which conclusion is supported?
Anticodons are written complementary to mRNA codons. A glycine-carrying tRNA changes from CCG to CAG but retains glycine. Which outcome is expected?
During protein synthesis, which process involves condensation reactions that form
…
| Mixture | RNA polymerase | Ribosomes | Supplied mRNA | New RNA | Polypeptide |
|---|
| P | present | present | absent | present | present |
| Q | absent | present | present | absent | present |
| R | present | absent | present | present | absent |
Each variant alters one ribosomal subunit without preventing assembly. Which assignment is supported?
| Ribosome | mRNA binding / % control | Simultaneous binding of two tRNAs / % control |
|---|---|---|
| Control | 100 | 100 |
| P | 18 | 94 |
| Q | 97 | 20 |
The template-DNA triplet for codon 2 changes from 3′-CTT-5′ to 3′-ATT-5′. Which effect follows?
| mRNA codon | Meaning |
|---|---|
| GAA | glutamate |
| UAA | stop |
RNA polymerase is required for both measured processes
Ribosomes are required for both measured processes
Ribosomes translate mRNA; RNA polymerase transcribes DNA
RNA polymerase translates mRNA; ribosomes transcribe DNA
Valine is inserted at GGC codons during elongation.
Glycine is inserted at CAG codons.
Valine is inserted at GUC codons.
Glycine is inserted at GUC codons.
